Post-AiTM persistence: new MFA/OAuth/inbox rule after anomalous M365 sign-in
Detects potential persistence establishment in M365 environments following anomalous or risky sign-in events. This pattern is characteristic of Adversary-in-the-Middle (AiTM) attacks where a session cookie is stolen, followed by immediate adversary actions to secure long-term access, such as MFA method registration, OAuth app consent, or mailbox rule configuration.
Microsoft Sentinel (KQL)
