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MediumMicrosoft Sentinel analyticsMicrosoft Security Research

Suspicious linking of existing user to external User

This query will detect when an attempt is made to update an existing user and link it to an guest or external identity. These activities are unusual and such linking of external identities should be investigated. In…

Description

This query will detect when an attempt is made to update an existing user and link it to an guest or external identity. These activities are unusual and such linking of external identities should be investigated. In some cases you may see internal Entra ID sync accounts (Sync_) do this which may be benign

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
azureactivedirectory
Log source service
auditlogs

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