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MediumMicrosoft Sentinel analytics

External guest invitation followed by Microsoft Entra ID PowerShell signin

By default guests have capability to invite more external guest users, guests also can do suspicious Microsoft Entra ID enumeration. This detection look at guest users, who have been invited or have invited recently,…

Description

By default guests have capability to invite more external guest users, guests also can do suspicious Microsoft Entra ID enumeration. This detection look at guest users, who have been invited or have invited recently, who also are logging via various PowerShell CLI. Ref : 'https://danielchronlund.com/2021/11/18/scary-azure-ad-tenant-enumeration-using-regular-b2b-guest-accounts/

Detection logic

Detection requirements

Platform
IaaSIdentity ProviderOffice SuiteSaaS

The rule states no platform. This is derived from the 3 ATT&CK techniques it maps to.

Log source product
azureactivedirectory
Log source service
auditlogssigninlogs

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