dMSA Shadow Credential Modification and Ouroboros Activity Detection
Detects modifications to the msDS-KeyCredentialLink attribute on Delegated Managed Service Account (dMSA) objects, indicating a potential Shadow Credential (X.509 certificate) planting. This allows an attacker to bypass managed password rotation and maintain permanent PKINIT access, as seen in the dMSA Ouroboros attack chain. The rule also monitors Event 4768 (PKINIT TGT requests with pre-authentication type 17) and Event 4662 (S4U2Self Object Access) for dMSA objects, which are key indicators of this attack.
Microsoft Sentinel (KQL)
