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Detect when a user adds SendAs permissions.
Monitor Microsoft 365 audit logs to look for the operation Add-RecipientPermission
. SendAs permission allows a user or group members to send messages that appear to come from the specified mailbox, mail contact, mail user, or group. Attackers may configure this to allow them to impersonate a user and send messages on their behalf from their mailbox, allowing the attacker to persist in the organization or move laterally by phishing other users.
@Parameters.Trustee
field to determine if the email address is external to your organization.{{@usr.email}}
.{{@usr.email}}
is not aware of the action:@usr.email
, @Parameters.Trustee
and @Parameters.Identity
using the Cloud SIEM - User Investigation dashboard.@threat_intel.results.subcategory:tor
with @threat_intel.results.category:tor
.