Investigating Transport Rule Creation

This guide will allow an administrator to verify that the alert pointing to the creation of a redirecting transport rule or a email-forwarding configuration of an inbox is sanctioned activity and not a malicious attempt at data exfiltration.

  1. Navigate to the Rules – Exchange Admin Center portal, locate and select the recently generated Redirect rule that was created within the portal. Verify that the rule creation is behaving in a sanctioned manner, either pointing to a known partner address or a sanctioned personal address.
  2. Additionally, it might be necessary to go to the mailbox level to verify that email-forwarding has not been established on the inbox itself. This can be done by navigating to the Mailboxes – Exchange Admin Center portal and verify that the mailbox listed does not have any unsanctioned forwarding pointing to an unknown address.

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