Entra ID password spray via ROPC grant yielding single-factor token without MFA claim
Detects successful password spraying attempts against Entra ID using the Resource Owner Password Credentials (ROPC) flow where multi-factor authentication (MFA) is bypassed. This rule specifically looks for multiple failed ROPC sign-in attempts from an IP address followed by a successful ROPC sign-in from the same IP address, where the authentication method reference (amr) claim does not include 'mfa'. This pattern is consistent with potential abuse of Conditional Access policy hidden exclusions, as described in CVE-2025-0309.
Microsoft Sentinel (KQL)
