The antimalware service executable, or MsMpEng.exe, to use the name you’ll probably see crop up in Task Manager, is a component of the Windows Defender antimalware suite of tools.

What is the Antimalware Service Executable process? The Antimalware Service Executable (its file name is MsMpEng.exe) process is Microsoft Defender's background tool that is responsible for scanning ...

The core software part of Microsoft Defender is the Antimalware Service Executable, which can be found in the MsMpEng.exe list in the Task Manager. The anti-malware service executable scans your ...

By applying this, the CPU usage of MsMpEng.exe is said to decrease by up to 75%. 1441918 - Antimalware Service Executable (Windows Defender) very active / high CPU when using Firefox https ...