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 product
- azureactivedirectorybehavioranalytics
- Log source service
- behavioranalyticssigninlogs
MITRE ATT&CK mappings
0 exclusive techniques.This is coverage no other published rule has; it is not this rule's total technique count.
No references are available for this detection.
From the source
- At source
- Open at source
- Upstream identifier
- bb3bb9da-9598-4d1f-af78-7cc2fd413b0b
- Tagged by the source as
- Persistence
Licence
- Published under
- MIT LicenseRead the licence
- Attribution
- Required
- Obtained under
- MITRead the origin licence
Authorship
- Published
- Sep 1, 2026
- Version
- 1