You need to know how to enable or disable Bloodhound heuristic virus detection in Symantec Endpoint Protection Manager (SEPM), or change the level of protection it uses.
For pre 14.2 versions:
From 14.2 & later versions:
Note that utilizing the Aggressive setting with clients that do not have access to Symantec Reputation Servers will result in a large amount of False Positives under the detection Heur.AdvML.A
Please make sure to plan your policies accordingly, and test before deploying into production.