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Entra ID OAuth Phishing via First-Party Microsoft Application

Detects potentially suspicious OAuth authorization activity in Microsoft Entra ID where first-party Microsoft applications from the FOCI (Family of Client IDs) group request access to Microsoft Graph or legacy Azure…

Description

Detects potentially suspicious OAuth authorization activity in Microsoft Entra ID where first-party Microsoft applications from the FOCI (Family of Client IDs) group request access to Microsoft Graph or legacy Azure AD resources. Developer tools like Azure CLI, Visual Studio Code, and Azure PowerShell accessing these resources are flagged, as they are commonly abused in phishing campaigns like ConsentFix. Additionally, any FOCI family application accessing the deprecated Windows Azure Active Directory resource is flagged since this API is rarely used legitimately and attackers target it for stealth. First-party apps are trusted by default in all tenants and cannot be blocked, making them ideal for OAuth phishing attacks.

Detection logic

Its licence does not clear it for publishing here

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Detection requirements

Platform
ContainersESXiIaaSIdentity ProviderLinuxmacOSNetwork DevicesOffice SuiteSaaSWindows

The rule states no platform. This is derived from the 5 ATT&CK techniques it maps to.

Log source category
event_index

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