Microsoft 365 SharePoint object shared with guest

microsoft-365

Classification:

attack

Tactic:

TA0009-collection

Technique:

T1213-data-from-information-repositories

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Goal

Detect when a user shares a Microsoft 365 Sharepoint document with a guest.

Strategy

This rule monitors the Microsoft 365 logs for the event name SharingInvitationCreated when the TargetUserOrGroupType is Guest.

Triage and response

Determine whether this document should be shared with the external user.