Steal or Forge Kerberos Tickets
Where this stands
One published detection covers this technique. Every one is unverified — no rule on Siemphony has been executed against real telemetry.
What the technique is
Adversaries may attempt to subvert Kerberos authentication by stealing or forging Kerberos tickets to enable Pass the Ticket. Kerberos is an authentication protocol widely used in modern Windows domain environments. In Kerberos environments, referred to as “realms”, there are three basic participants: client, service, and Key Distribution Center (KDC). Clients request access to a service and through the exchange of Kerberos tickets, originating from KDC, they are granted access after having successfully authenticated. The KDC is responsible for both authentication and ticket granting. Adversaries may attempt to abuse Kerberos by stealing tickets or forging tickets to enable unauthorized access. On Windows, the built-in klist utility can be used to list and analyze cached Kerberos tickets.
Read it on attack.mitre.orgWhat MITRE says you would watch
- AN1443
Detects anomalous Kerberos activity such as forged or stolen tickets by correlating malformed fields in logon events, RC4-encrypted TGTs, or TGS requests without corresponding TGT requests. Also detects suspicious processes accessing LSASS memory for ticket extraction.
- AN1444
Detects suspicious access to SSSD secrets database and Kerberos key material indicating ticket theft or replay attempts. Correlates anomalous file access with unusual Kerberos service ticket requests.
- AN1445
Detects attempts to forge or replay Kerberos tickets by monitoring Unified Logs for anomalous kinit/klist activity and correlating unusual authentication sequences.
Technique names and descriptions © MITRE ATT&CK®, CC BY 4.0. Not endorsed by MITRE.