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Detect when a Teams member is added and then removed within a short amount of time. An insider threat might add an external account to exfiltrate data then quickly remove the user to hide their tracks.
Using the THEN
operator, monitor Microsoft Teams audit logs to look for events with an @evt.name
value of MemberAdded
then MemberRemoved
, where the Members.UPN
has #EXT#
within it. The EXT
value is used to denote that a user is an external user.
{{@usr.email}}
intended to add and remove the external user and if the external user should indeed have been added.{{@usr.email}}
didn’t intend to add or remove the external user or the external user is not approved:{{@usr.email}}
using the Cloud SIEM - User Investigation dashboard.