The Target and Actor Process is not called out in the same way as Symantec Endpoint Protection Manager (SEPM) 14.x.
Resolution
Login to Symantec Cyber Defense Manager and select Endpoint
Select Alerts and Events
Find and Select the Tamper Protection event. You can filter by severity Major and the Technology will be listed as Agent Framework.
To find the Target and Actor scroll to the bottom and find Associated Artifacts. The first file listed will always be the Target. The second file listed will be the Actor.