analyzing-web-server-logs-for-intrusion

# Analyzing Web Server Logs for Intrusion ## When to Use - When investigating security incidents that require analyzing web server logs for intrusion - When building detection rules or threat hunting queries for this domain - When SOC analysts need structured procedures for this analysis type - When validating security monitoring coverage for related attack techniques ## Prerequisites - Familiarity with security operations concepts and tools - Access to a test or lab environment for safe execution - Python 3.8+ with required dependencies installed - Appropriate authorization for any testing activities ## 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 ``...