M365 Identity OAuth Illicit Consent Grant by Rare Client and User

Description

Identifies an Microsoft 365 illicit consent grant request on-behalf-of a registered Entra ID application. Adversaries may create and register an application in Microsoft Entra ID for the purpose of requesting user consent to access resources in Microsoft 365. This is accomplished by tricking a user into granting consent to the application, typically via a pre-made phishing URL. This establishes an OAuth grant that allows the malicious client applocation to access resources in Microsoft 365 on-behalf-of the user.

Detection logic

Its licence does not clear it for publishing here

Sunturai publishes a detection's own text where the licence it arrived under has been reviewed and permits it, and Elastic License 2.0 has not. The query as its source wrote it, its canonical form and the hash that pins this revision are in the workspace record.

Detection requirements

Platform: Containers ESXi IaaS Identity Provider Linux macOS Network Devices Office Suite SaaS Windows
The rule states no platform. This is derived from the 3 ATT&CK techniques it maps to.
Log source category: event_index

References

Links the source published beside this detection. Reference is the link the source wrote, unmodified. Class is decided by this catalogue from the host and path, not stated by the source. Cited by counts published detections citing the same resource, including this one, and the sources beneath it count the repositories this catalogue ingests, which is not the same as independent research.
Reference	Class	Cited by
docs.microsoft.com/en-us/defender-cloud-apps/investigate-risky-oauth#how-to-detect-risky-oauth-apps	Product documentation	2
docs.microsoft.com/en-us/microsoft-365/security/office-365-security/detect-and-remediate-illicit-consent-grants?view=o365-worldwide	Product documentation	2
learn.microsoft.com/en-us/office/office-365-management-api/office-365-management-activity-api-schema	Product documentation	2
www.cloud-architekt.net/detection-and-mitigation-consent-grant-attacks-azuread/	Unclassified	2
www.wiz.io/blog/midnight-blizzard-microsoft-breach-analysis-and-best-practices	Threat report	2

Detection rules

M365 Identity OAuth Illicit Consent Grant by Rare Client and User

Description

Detection logic

Detection requirements

MITRE ATT&CK mappings

References

From the source

Licence

Authorship

Detection rules