From cybersec-toolkit
Detect Cobalt Strike beacon network activity using TLS certificate signatures, JA3/JA3S/JARM fingerprints, HTTP C2 profile matching, beacon jitter analysis, and named pipe detection via Zeek, Suricata, and Python PCAP analysis.
How this skill is triggered — by the user, by Claude, or both
Slash command
/cybersec-toolkit:hunting-for-cobalt-strike-beaconsThe summary Claude sees in its skill listing — used to decide when to auto-load this skill
Cobalt Strike is the most prevalent command-and-control framework used by both red teams and threat actors. Beacon, its primary payload, communicates with team servers using configurable HTTP/HTTPS/DNS profiles that can mimic legitimate traffic. However, default configurations and behavioral patterns remain detectable through TLS certificate analysis (default serial 8BB00EE), JA3/JA3S fingerpri...
Cobalt Strike is the most prevalent command-and-control framework used by both red teams and threat actors. Beacon, its primary payload, communicates with team servers using configurable HTTP/HTTPS/DNS profiles that can mimic legitimate traffic. However, default configurations and behavioral patterns remain detectable through TLS certificate analysis (default serial 8BB00EE), JA3/JA3S fingerprinting, beacon interval jitter analysis, and HTTP malleable profile pattern matching. This skill covers building detection capabilities using Zeek network logs, Suricata IDS rules, and Python-based PCAP analysis to identify beacon callbacks in network traffic.
Detect default Cobalt Strike certificates using JA3S fingerprints, certificate serial numbers, and JARM fingerprints in Zeek ssl.log.
Analyze connection timing patterns to identify regular callback intervals with configurable jitter, characteristic of beacon behavior.
Match HTTP request patterns (URI paths, headers, user-agents) against known malleable C2 profiles.
Combine multiple indicators (TLS + timing + HTTP profile) into a composite beacon confidence score.
JSON report containing detected beacon candidates with confidence scores, TLS fingerprints, timing analysis, HTTP profile matches, and recommended response actions.
npx claudepluginhub 26zl/cybersec-toolkit --plugin cybersec-toolkitDetect Cobalt Strike beacon network activity using TLS certificate signatures, JA3/JA3S/JARM fingerprints, HTTP C2 profile matching, beacon jitter analysis, and named pipe detection via Zeek, Suricata, and Python PCAP analysis.
Detects Cobalt Strike beacon C2 activity in network traffic using Zeek logs, Suricata rules, Python PCAP analysis for TLS cert signatures, JA3/JA3S/JARM fingerprints, jitter, and HTTP profiles.
Detects Cobalt Strike beacons in network traffic via default TLS cert serial 8BB00EE, JA3/JA3S/JARM fingerprints, HTTP C2 profile matching, jitter analysis, named pipes using Zeek, Suricata, Python PCAP.