---
name: analyzing-web-server-logs-for-intrusion
description: >-
  Parse Apache and Nginx access logs to detect SQL injection attempts, local file inclusion,
  directory traversal, web scanner fingerprints, and brute-force patterns. Uses regex-based
  pattern matching against OWASP attack signatures, GeoIP enrichment for source attribution,
  and statistical anomaly detection for request frequency and response size outliers.
domain: cybersecurity
subdomain: security-operations
tags: [analyzing, web, server, logs]
version: "1.0"
author: mahipal
license: Apache-2.0
---

## Instructions

1. Install dependencies: `pip install geoip2 user-agents`
2. Collect web server access logs in Combined Log Format (Apache) or Nginx default format.
3. Parse each log entry extracting: IP, timestamp, method, URI, status code, response size, user-agent, referer.
4. Apply detection rules:
   - SQL injection: `UNION SELECT`, `OR 1=1`, `' OR '`, hex encoding patterns
   - LFI/Path traversal: `../`, `/etc/passwd`, `/proc/self`, `php://filter`
   - XSS: `<script>`, `javascript:`, `onerror=`, `onload=`
   - Scanner signatures: nikto, sqlmap, dirbuster, gobuster, wfuzz user-agents
   - Brute force: >50 POST requests to login endpoints from same IP in 5 minutes
5. Enrich with GeoIP data and generate a prioritized findings report.

```bash
python scripts/agent.py --log-file /var/log/nginx/access.log --geoip-db GeoLite2-City.mmdb --output web_intrusion_report.json
```

## Examples

### Detect SQLi in URI
```
192.168.1.100 - - [15/Jan/2024:10:30:45 +0000] "GET /products?id=1' UNION SELECT username,password FROM users-- HTTP/1.1" 200 4532
```

### Scanner User-Agent Detection
```
Nikto/2.1.6, sqlmap/1.7, DirBuster-1.0-RC1, gobuster/3.1.0
```
