Automatically Shutdown the File Server
The safest, but possibly most disruptive protection mechanism would be to stop the server so nothing can be accessed.
In the example below, we've specified a zero second delay in shutting down the server - no reason to give the ransomware any extra time to cause trouble. Also note that this action would shutdown a specific server, which is important when using Satellites.
This can be accomplished using the Reboot Server action.