Mail Flow Rule for Forwarding Created
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About the rule
Rule Type
Standard
Rule Description
Flags when a transport (mail flow) rule is created to forward emails, potentially indicating exfiltration.
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "DETECTION_ACTION_M365_NEW_TRANSPORT_RULE" AND ((PARAMETERS contains "blindcopyto" OR PARAMETERS contains "copyto" OR PARAMETERS contains "redirectmessageto")) select Action1.CALLER,Action1.TARGET,Action1.IPADDRESS,Action1.PARAMETERS,Action1.OPERATION
Detection
Execution Mode
realtime
Log Sources
Microsoft 365
