External user from a new organisation added to Teams

This query identifies external users added to Teams where the user's domain is not one previously seen in Teams data.

Detection logic

Detection requirements

Platform: Containers ESXi IaaS Identity Provider Linux macOS Network Devices Office Suite SaaS 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_teams

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Detection rules

External user from a new organisation added to Teams

Detection logic

Detection requirements

MITRE ATT&CK mappings

From the source

Licence

Authorship

Detection rules