ReddRadar
Agent skill
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.
Install this agent skill to your Project
npx add-skill https://github.com/autohandai/community-skills/tree/main/hunting-for-webshells-in-web-servers
SKILL.md
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
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