Individual skill
analyzing-dns-logs-for-exfiltration
Analyzes DNS query logs to detect data exfiltration via DNS tunneling, DGA domain communication, and covert C2 channels using entropy analysis, query volume anomalies, and subdomain length detection in SIEM platforms. Use when SOC teams need to identify DNS-based threats that bypass traditional network security controls.
internal/tools/skills/data/soc-operations/analyzing-dns-logs-for-exfiltration/SKILL.md
Source commit d42f381ad34843e71a42658e5c57290c713e85af
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- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- Yes
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Instructions only
- Last checked
- Nov 9, 2026
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Repository context
- Repository stars (not skill ratings)
- 1,325
- Repository last updated
- Nov 9, 2026
- License
- Apache-2.0
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- cybersecurity Repository topic
- security Repository topic
- bug-bounty Repository topic
- automation Repository topic
- autonomous-pentesting Repository topic
- ai-agent Repository topic
- ai-security Repository topic
- ethical-hacking Repository topic
- golang Repository topic
- penetration-testing Repository topic
- soc Declared skill tag
- dns Declared skill tag
- exfiltration Declared skill tag
- dns-tunneling Declared skill tag
- dga Declared skill tag
- c2-detection Declared skill tag
- splunk Declared skill tag
- threat-detection Declared skill tag
- security Derived category
- data Derived category
Files and excerpt
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Read excerpt
# Analyzing DNS Logs for Exfiltration
## When to Use
Use this skill when:
- SOC teams suspect data exfiltration through DNS tunneling to bypass firewall/proxy controls
- Threat intelligence indicates adversaries using DNS-based C2 channels (e.g., Cobalt Strike DNS beacon)
- UEBA detects anomalous DNS query volumes from specific hosts
- Malware analysis reveals DNS-over-HTTPS (DoH) or DNS tunneling capabilities
**Do not use** for standard DNS troubleshooting or availability monitoring — this skill focuses on security-relevant DNS abuse detection.
## Detection Gaps & Validation
- **DoH/DoT blind spot:** if the endpoint resolves over DNS-over-HTTPS (`1.1.1.1`, `8.8.8.8:443`) or DNS-over-TLS (port 853), the `stream:dns`/Zeek tap never sees the query and every entropy/length search above returns nothing. Confirm coverage by joining `index=proxy OR index=firewall dest_port IN (443,853)` against the known public-resolver IP list before declaring a host clean.