Important Detection 2026: Kerberoasting via Anomalous Service Ticket Requests (T1558.003)
Detects Kerberos service ticket requests (Event ID 4769) that utilize weak RC4 encryption (0x17). This behavior is characteristic of Kerberoasting, where attackers request service tickets for service accounts in order to perform offline brute-force attacks to recover the service account password. The rule filters out machine account requests and focuses on standard user or service account requests.
Sigma
