Hello,
Please Explain the Issue in Detail.
It is important to understand the Symptoms you are facing in detail so that we could assist you appropriately.
I understand that you are having a Hidden Folders on the File Server. And you have send Suspicious Files to Symantec.
However, you haven't specified, if they are hidden, how did you come to know about them and What were the results of the Submission?
How many machines do you have in Network and Is that the hidden folders found only on FileServer?
Did Symantec ever detect Threats? If yes, what were those?
If you could upload the Risk Logs from Symantec Endpoint Protection?