analyzing-web-server-logs-for-intrusion
This Claude Code skill parses Apache and Nginx web server access logs to identify security threats including SQL injection attempts, path traversal attacks, cross-site scripting payloads, and brute force activity. Use it when analyzing logs from security incidents, building threat detection rules, or validating security monitoring coverage in SOC environments.
git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills /tmp/analyzing-web-server-logs-for-intrusion && cp -r /tmp/analyzing-web-server-logs-for-intrusion/skills/analyzing-web-server-logs-for-intrusion ~/.claude/skills/analyzing-web-server-logs-for-intrusionSKILL.md
# 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 ``` ## 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 ```
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