Individual skill
detecting-dns-exfiltration-with-dns-query-analysis
Detect data exfiltration via DNS tunneling (tools like iodine, dnscat2, dns2tcp) by analyzing query entropy, subdomain length, query volume to single domains, TXT/CNAME/NULL record abuse, and oversized response payloads using passive DNS monitoring and statistical/ML methods. Use when hunting for covert DNS-based data exfiltration or building a passive DNS anomaly detection capability.
skills/detecting-dns-exfiltration-with-dns-query-analysis/SKILL.md
Source commit 54a798831d2266a3ca61ce68a7acb80b81160d57
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- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- Yes
- Repository scan complete
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- Skill scan complete
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- Observed behavior
- Network or broad shell
- Last checked
- Nov 9, 2026
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Repository context
- Repository stars (not skill ratings)
- 35,862
- 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
- dns-exfiltration Declared skill tag
- dns-tunneling Declared skill tag
- data-exfiltration Declared skill tag
- threat-detection Declared skill tag
- entropy-analysis Declared skill tag
- passive-dns Declared skill tag
- network-monitoring Declared skill tag
- iodine Declared skill tag
- dnscat2 Declared skill tag
- data Derived category
- security Derived category
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LICENSEasset · 11,255 bytesSKILL.mdcore · 16,776 bytesSKILL.mdcore · 16,776 bytesSKILL.mdcore · 16,776 bytesSKILL.mdcore · 16,776 bytesSKILL.mdcore · 16,776 bytesreferences/api-reference.mddoc · 1,525 bytesscripts/agent.pyruns · 6,114 bytes
Read excerpt
# Detecting DNS Exfiltration with DNS Query Analysis
## Overview
DNS exfiltration exploits the Domain Name System as a covert channel to extract data from compromised networks. Attackers encode stolen data into DNS query names (subdomains) or DNS response records (TXT, CNAME, NULL), bypassing traditional security controls that typically allow DNS traffic unrestricted. Tools like iodine, dnscat2, and dns2tcp enable full TCP tunneling over DNS. Detection requires analyzing DNS query patterns for anomalies including excessive query length, high entropy subdomain strings, abnormal query volumes to single domains, and oversized TXT record responses. This skill covers building a comprehensive DNS exfiltration detection capability using passive DNS analysis, statistical methods, and machine learning approaches.
## When to Use
- When investigating security incidents that require detecting dns exfiltration with dns query analysis
- 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
