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https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git
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mukul975
c47eed6a64
- Fix 25 shell=True subprocess calls with list-based commands - Fix 49 verify=False in defensive skills (env-var override) - Add timeout to 231 HTTP/subprocess/socket calls - Fix 6 SQL injection patterns with whitelist validation - Replace 8 __import__() with standard imports - Remove 701 unused imports across 442 files - Add authorized-testing disclaimers to all offensive skills - Complete 11 incomplete skill directories - Expand 10 stub SKILL.md files with full content - Fix 2 YAML parse errors in frontmatter - Fix 5 pre-existing syntax errors - Convert 22 hardcoded paths/ports to environment variables - Back up 21 redundant skill pairs to .bak - Fix 2 global declaration errors - 724/724 skills with full folder anatomy (SKILL.md + agent.py + api-reference.md + LICENSE) - 0 compile errors across all 724 agent.py files
1.4 KiB
1.4 KiB
name, description, domain, subdomain, tags, version, author, license
| name | description | domain | subdomain | tags | version | author | license | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| hunting-for-webshells-in-web-servers | Detect webshells planted on web servers by scanning for high-entropy files, suspicious PHP/JSP/ASP patterns (eval, base64_decode, system, passthru), recently modified files in web roots, and anomalous file sizes. Uses Shannon entropy calculation to flag obfuscated payloads and regex pattern matching against known webshell signatures. | cybersecurity | security-operations |
|
1.0 | mahipal | Apache-2.0 |
Instructions
- Install dependencies:
pip install yara-python - Identify web server document roots to scan (e.g.,
/var/www/html,/opt/lampp/htdocs). - Run the agent to scan for webshells:
- Shannon entropy analysis flags files with entropy > 5.5
- Pattern matching detects eval(), base64_decode(), system(), passthru(), shell_exec()
- File modification time analysis finds recently changed files
- Extension filtering targets .php, .jsp, .asp, .aspx, .cgi, .py files
python scripts/agent.py --webroot /var/www/html --output webshell_report.json
Examples
High-Entropy PHP Webshell Detection
File: /var/www/html/uploads/img_thumb.php
Entropy: 6.12 (threshold: 5.5)
Patterns matched: eval(), base64_decode(), str_rot13()
Last modified: 2025-12-01 03:42:00 (outside business hours)
Verdict: SUSPICIOUS - likely obfuscated webshell