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.