Individual skill
detecting-network-anomalies-with-zeek
Deploy and configure Zeek (formerly Bro) to passively analyze network traffic, generate structured connection/DNS/HTTP/SSL/file logs, detect anomalous behavior, and write custom scripts for organization-specific threats. Use for passive monitoring at network choke points, feeding SIEM/threat hunting with protocol metadata, or retrospective log analysis during incident response; not a substitute for inline IDS/IPS or host agents.
skills/detecting-network-anomalies-with-zeek/SKILL.md
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- Last checked
- Nov 9, 2026
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- Repository stars (not skill ratings)
- 35,909
- Repository last updated
- Aug 31, 2026
- License
- Apache-2.0
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- ai-agents Repository topic
- claude-code Repository topic
- cybersecurity Repository topic
- incident-response Repository topic
- mitre-attack Repository topic
- penetration-testing Repository topic
- red-team Repository topic
- security Repository topic
- cloud-security Repository topic
- malware-analysis Repository topic
- network-security Declared skill tag
- zeek Declared skill tag
- network-monitoring Declared skill tag
- anomaly-detection Declared skill tag
- threat-hunting Declared skill tag
- security Derived category
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Read excerpt
# Detecting Network Anomalies with Zeek
## When to Use
- Deploying passive network security monitoring at key network choke points for continuous visibility
- Generating structured connection, DNS, HTTP, SSL, and file transfer logs for SIEM ingestion and threat hunting
- Writing custom Zeek scripts to detect organization-specific threats, policy violations, or beaconing behavior
- Performing retrospective analysis on network metadata to investigate security incidents
- Complementing IDS solutions with protocol-level metadata analysis that signature-based tools may miss
**Do not use** as a replacement for inline IDS/IPS that can actively block traffic, for monitoring encrypted payloads without TLS inspection, or on endpoints where host-based agents are more appropriate.
## Prerequisites
- Zeek 6.0+ installed from source or package manager (`zeek --version`)