Non-owner mailbox login activity

Finds non-owner mailbox access by admin/delegate permissions. Whitelist valid users and check others for unauthorized access.

Detection logic

Detection requirements

Platform: Linux macOS Network Devices Office Suite Windows
The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.
Log source product: office365
Log source service: officeactivity_exchange

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Detection rules

Non-owner mailbox login activity

Detection logic

Detection requirements

MITRE ATT&CK mappings

From the source

Licence

Authorship

Detection rules