Mail redirect via ExO transport rule

Identifies when Exchange Online transport rule configured to forward emails. This could be an adversary mailbox configured to collect mail from multiple user accounts.

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

Mail redirect via ExO transport rule

Detection logic

Detection requirements

MITRE ATT&CK mappings

From the source

Licence

Authorship

Detection rules