External user added in teams

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About the rule

Rule Type

Standard

Rule Description

Detects instances where an external user account is added in teams.

Severity

Attention

Rule Requirement

Criteria

Action1: actionname = "DETECTION_ACTION_M365_TEAMS_MEMBER_ADDED" AND (MEMBERSID contains "#EXT#") select Action1.CALLER,Action1.TARGETUSER,Action1.MEMBERSID,Action1.OPERATION

Detection

Execution Mode

realtime

Log Sources

Microsoft 365