DC Machine Account TGT Request from Non-DC Source IP — Detection Rule
Detects a Kerberos TGT request (Event 4768) for a known Domain Controller machine account originating from an IP address that is not a known Domain Controller. DC machine accounts should only request TGTs from their own IP. Any TGT request for a DC account from a workstation or non-DC host is anomalous and indicates one of the following: - PKINIT abuse (CVE-2026-54121 / Certighost): attacker authenticating as a DC via a forged certificate from their workstation - Overpass-the-Hash: attacker converting a stolen DC machine account NTLM hash into a Kerberos TGT - Pass-the-Hash (RC4): attacker using the DC machine account hash directly with Kerberos