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UnknownMicrosoft Sentinel analytics

Anomalous Failed Logon

Adversaries with no prior knowledge of legitimate credentials within the system or environment may guess passwords to attempt access to accounts. Emotet, for example, has been observed using a hard-coded list of…

Description

Adversaries with no prior knowledge of legitimate credentials within the system or environment may guess passwords to attempt access to accounts. Emotet, for example, has been observed using a hard-coded list of passwords to brute-force user accounts. The query below generates an output of all users with 'High' BlastRadius that perform failed Sign-in:Invalid username or password.

Detection logic

Detection requirements

Platform
ContainersESXiIaaSIdentity ProviderLinuxmacOSNetwork DevicesOffice SuiteSaaSWindows

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

Log source product
azureactivedirectorybehavioranalytics
Log source service
behavioranalyticssigninlogs

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