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MediumSplunk security contentMauricio Velazco +1

O365 ApplicationImpersonation Role Assigned

The following analytic detects the assignment of the ApplicationImpersonation role in Office 365 to a user or application. It uses the Office 365 Management Activity API to monitor Azure Active Directory audit logs…

Description

The following analytic detects the assignment of the ApplicationImpersonation role in Office 365 to a user or application. It uses the Office 365 Management Activity API to monitor Azure Active Directory audit logs for role assignment events. This activity is significant because the ApplicationImpersonation role allows impersonation of any user, enabling access to and modification of their mailbox. If confirmed malicious, an attacker could gain unauthorized access to sensitive information, manipulate mailbox data, and perform actions as a legitimate user, posing a severe security risk to the organization.

Detection logic

Detection requirements

Platform
Office SuiteWindows

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

Log source category
o365

Known benign triggers

  • While infrequent, the ApplicationImpersonation role may be granted for leigimate reasons, filter as needed.

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