Anomalous access to other users' mailboxes

Looks for users accessing multiple other users' mailboxes or accessing multiple folders in another users mailbox.

Detection logic

Detection requirements

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

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Detection rules

Anomalous access to other users' mailboxes

Detection logic

Detection requirements

MITRE ATT&CK mappings

From the source

Licence

Authorship

Detection rules