Rare Domains in External Teams Messages

Detects rare domains (seen in fewer than 3 Teams messages) appearing in external Microsoft Teams threads within the last 24 hours.

Detection logic

Detection requirements

Platform: Containers IaaS Identity Provider Linux macOS Office Suite SaaS Windows
The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.
Log source product: microsoftthreatprotection
Log source service: messageevents messageurlinfo urlclickevents

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Detection rules

Rare Domains in External Teams Messages

Detection logic

Detection requirements

MITRE ATT&CK mappings

From the source

Licence

Authorship

Detection rules