hunting-for-webshells-in-web-servers

Included with Lifetime

$97 forever

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.

Generalhuntingforwebshellswebscripts

What this skill does


## Instructions

1. Install dependencies: `pip install yara-python`
2. Identify web server document roots to scan (e.g., `/var/www/html`, `/opt/lampp/htdocs`).
3. 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

```bash
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
```

Files: 4

Size: 20.9 KB

Complexity: 58/100

Category: General

Source: https://github.com/autohandai/community-skills/tree/main/hunting-for-webshells-in-web-servers

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