Individual skill
hunting-for-dns-tunneling-with-zeek
Detects DNS tunneling and covert-channel data exfiltration by analyzing Zeek dns.log for high-entropy subdomain queries, excessive query volume, abnormally long query lengths, and unusual DNS record types (TXT/NULL/CNAME). Use when hunting for DNS-based data exfiltration or C2 covert channels in network traffic, or when triaging suspicious DNS query volume/patterns surfaced by Zeek logs.
skills/hunting-for-dns-tunneling-with-zeek/SKILL.md
Source commit 54a798831d2266a3ca61ce68a7acb80b81160d57
What was checked
- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- Yes
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Network or broad shell
- Last checked
- Nov 9, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
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Repository context
- Repository stars (not skill ratings)
- 35,926
- Repository last updated
- Aug 31, 2026
- License
- Apache-2.0
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- 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
- threat-hunting Declared skill tag
- dns-tunneling Declared skill tag
- zeek Declared skill tag
- data-exfiltration Declared skill tag
- covert-channel Declared skill tag
- mitre-t1071-004 Declared skill tag
- network-monitoring Declared skill tag
- data Derived category
- security Derived category
Files and excerpt
File metadata and permitted, redacted excerpts come from the recorded scan. Source links are pinned to that commit.
Browse files
LICENSEasset · 11,255 bytesSKILL.mdcore · 6,661 bytesSKILL.mdcore · 6,661 bytesassets/template.mddoc · 1,046 bytesreferences/api-reference.mddoc · 1,567 bytesreferences/standards.mddoc · 2,256 bytesreferences/workflows.mddoc · 2,508 bytesscripts/agent.pyruns · 5,605 bytesscripts/process.pyruns · 6,010 bytes
Read excerpt
# Hunting for DNS Tunneling with Zeek
## When to Use
- When hunting for data exfiltration over DNS covert channels
- After threat intelligence indicates DNS-based C2 frameworks targeting your industry
- When dns.log shows unusually high query volumes to specific domains
- During investigation of suspected data theft where no HTTP/S exfiltration is found
- When monitoring for tools like iodine, dnscat2, DNSExfiltrator, or DNS-over-HTTPS tunneling
## Prerequisites
- Zeek deployed on network tap or SPAN port capturing DNS traffic
- Zeek dns.log with full query and response fields