Azure AD Authenticator App Device Modification Detection
This rule monitors changes to users' Authenticator app registrations within Azure Active Directory. It detects unauthorized device additions or removals, which can be used by adversaries to bypass multi-factor authentication or maintain persistent access to compromised accounts. The rule parses audit logs for 'Update user' operations specifically targeting 'StrongAuthenticationPhoneAppDetail' to identify both added and removed Authenticator app devices.
Microsoft Sentinel (KQL)
