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.
Install
npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill detecting-dns-exfiltration-with-dns-query-analysisnpx skills add mukul975/Anthropic-Cybersecurity-Skills --skill detecting-dns-exfiltration-with-dns-query-analysis -a claude-code -gnpx skills add mukul975/Anthropic-Cybersecurity-Skills --skill detecting-dns-exfiltration-with-dns-query-analysis -a codex -ggemini skills install https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git --path skills/detecting-dns-exfiltration-with-dns-query-analysisgh skill install mukul975/Anthropic-Cybersecurity-Skills detecting-dns-exfiltration-with-dns-query-analysisgit clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills /tmp/mukul975__Anthropic-Cybersecurity-Skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/mukul975__Anthropic-Cybersecurity-Skills/skills/detecting-dns-exfiltration-with-dns-query-analysis ~/.claude/skills/detecting-dns-exfiltration-with-dns-query-analysis # Claude Code
cp -R /tmp/mukul975__Anthropic-Cybersecurity-Skills/skills/detecting-dns-exfiltration-with-dns-query-analysis ~/.agents/skills/detecting-dns-exfiltration-with-dns-query-analysis # Codex, Cursor, Gemini CLI, Copilot, OpenCode