ATT&CK T1558.001 - Golden Ticket: AS-REQ without pre-auth

Darshan Thummar@Mighty

•updated Jun 10, 2026•0•0•4

This rule detects a specific type of Kerberos AS-REQ (Authentication Service Request) that lacks pre-authentication, which is characteristic of a 'Golden Ticket' attack (ATT&CK T1558.001). The rule specifically looks for UDP traffic on port 88 (Kerberos default port) to the home network, containing the byte sequences '|30|' and '|a1 03 02 01 05|'. These content checks are indicative of the structure of a Kerberos AS-REQ packet without the expected pre-authentication data.