AK47C2 Backdoor DNS Communication
This rule detects potential DNS command and control (C2) activity from the AK47C2 backdoor. The backdoor communicates by sending long, hex-encoded strings as subdomains to a C2 server, specifically targeting the domain 'update.updatemicfosoft.com'. The detection logic looks for DNS queries to this specific domain where the subdomain is longer than 40 characters and consists of hex characters, optionally prefixed with 's', '1', '2', or 'a'.
Microsoft Sentinel (KQL)
