Accessed files shared by temporary external user

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This detection identifies when an external user is added to a Team or Teams chat and shares a file which is accessed by many users (>10) and the users is removed within short period of time. This might be an indicator of suspicious activity.

Attribute Value
Type Analytic Rule
Solution Microsoft 365
ID bff058b2-500e-4ae5-bb49-a5b1423cbd5b
Severity Low
Status Available
Kind Scheduled
Tactics InitialAccess
Techniques T1566
Required Connectors Office365, Office365
Source View on GitHub

Tables Used

This content item queries data from the following tables:

Table Selection Criteria Transformations Ingestion API Lake-Only
OfficeActivity OfficeWorkload == "MicrosoftTeams"
RecordType == "SharePointFileOperation"
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