Correlated AADSTS 50034/50126/700016 sequence from same source indicating enumeration
Detects anomalous authentication patterns originating from a single IP address where multiple users are targeted. The rule specifically monitors for a combination of error codes (50034 - User not found, 50126 - Invalid credentials, 700016 - Multi-factor authentication required) to identify potential password spraying or brute force activity targeting Microsoft Entra ID (formerly Azure AD).
Microsoft Sentinel (KQL)
