Technical Support doesn’t support custom rules with ENS. Customers who develop their own custom Access Protection rules and Exploit Prevention Expert Rules in ENS Threat Prevention assume all responsibility for future troubleshooting and updating.
 
If custom rules have adversely affected your systems and environment, or if you suspect they have, Technical Support recommends that you remove or disable those rules.
 
Assistance with writing custom rules is available through McAfee Professional Services. For further details, contact your McAfee Sales representative.