Microsoft Teams chat initiated by a suspicious external user

Use AlertInfo and AlertEvidence to collect general information and clickable links to more IOCs about suspicious external Teams messages.

Detection logic

Detection requirements

Platform: Identity Provider Linux macOS Office Suite SaaS Windows
The rule states no platform. This is derived from the ATT&CK technique it maps to.
Log source product: microsoftthreatprotection
Log source service: alertevidence alertinfo

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Detection rules

Microsoft Teams chat initiated by a suspicious external user

Detection logic

Detection requirements

MITRE ATT&CK mappings

From the source

Licence

Authorship

Detection rules