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Detect when a user adds or modifies an Exchange transport rule to automatically forward emails.
Monitor Microsoft 365 Exchange audit logs to look for the operations New-TransportRule
or Set-TransportRule
, where a value is set for @Parameters.BlindCopyTo
or @Parameters.RedirectMessageTo
. Attackers often create email forwarding rules to collect sensitive information and maintain persistence in the organization.
@Parameters.BlindCopyTo
or @Parameters.RedirectMessageTo
and determine if the rule is sending email to an external non-company owned domain. Additional investigation points include the following:@AppId
value, to determine if it’s unusual for the user.{{@usr.email}}
.{{@usr.email}}
is not aware of the mail forwarding rule:{{@usr.email}}
using the Cloud SIEM - User Investigation dashboard.@threat_intel.results.subcategory:tor
with @threat_intel.results.category:tor
.