Exchange 2013 Malware Filter and ScanningProcess.exe

Hi all...

We have an Exchange 2013 environment with an external Mail Security Appliance (FortiMail),  because of this our Malware Filter was disabled, but the process ScanningProcess.exe (Microsoft Filtering Server Scanning Process) are still running and sometimes hangs the CPU for several minutes scanning attachments.

Is there a method to disable the process and avoid the CPU high use?

(all servers have Exchange 2013 CU7)