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Anomalous Sign-in by New or Dormant Account

Adversaries may steal the credentials of a specific user or service account using credential access techniques or capture credentials earlier in their reconnaissance process through social engineering as a means of…

Description

Adversaries may steal the credentials of a specific user or service account using credential access techniques or capture credentials earlier in their reconnaissance process through social engineering as a means of gaining persistence." Umbreon, for example, creates valid users to provide access to the system. The query below generates an output of successful sign-in with one or more of the following indications:- - performed by new or recently dormant accounts - where one or more features of the activity deviate from the user, his peers, or the tenant's profile. - performed by a user with risk information from Microsoft Entra ID

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 service
behavioranalyticssigninlogs

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