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MediumMicrosoft Sentinel analytics

User Accounts - Sign in Failure due to CA Spikes

Identifies spike in failed sign-ins from user accounts due to conditional access policied. Spike is determined based on Time series anomaly which will look at historical baseline values. Ref :…

Description

Identifies spike in failed sign-ins from user accounts due to conditional access policied. Spike is determined based on Time series anomaly which will look at historical baseline values. Ref : https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-user-accounts#monitoring-for-failed-unusual-sign-ins This query has also been updated to include UEBA logs IdentityInfo and BehaviorAnalytics for contextual information around the results.

Detection logic

Detection requirements

Platform
IaaSIdentity ProviderOffice SuiteSaaS

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Log source product
azureactivedirectorybehavioranalytics
Log source service
aadnoninteractiveusersigninlogsbehavioranalyticsidentityinfosigninlogs

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