What is MpEng.exe?

The genuine MpEng.exe file is a software component of Windows Defender | Microsoft OneCare by Microsoft.
“MpEng.exe” resides in Windows operating systems for Windows Defender and Microsoft OneCare software. The file is known as the malware protection engine, which scans for infections, manages quarantine actions, and controls vault storage. “MpEng.exe” protects the PC from internet infections, as well as internal/code-based attacks. It is the main engine for the malware protection software that is included in both Defender and OneCare. Microsoft began in 1975 with a focus on input/output programming. Since then, the company has grown immensely to provide worldwide applications and hardware that make digital technology useful and convenient.

MPEng stands for Malware Protection Engine

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the MpEng.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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MpEng.exe file information

The process known as Microsoft Malware Protection Engine Host belongs to software Microsoft Malware Protection by Microsoft (

Description: MpEng.exe is not essential for the Windows OS and causes relatively few problems. The MpEng.exe file is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 273,240 bytes (96% of all occurrences) or 265,456 bytes. 
The program is not visible. The file is digitally signed. MpEng.exe is not a Windows system file. The software can be uninstalled in the Control Panel. MpEng.exe is able to monitor applications. Therefore the technical security rating is 21% dangerous.

Uninstalling this variant: You can completely remove Microsoft Malware Protection or Windows Live OneCare (Control Panel ⇒ Uninstall a Program).

Recommended: Identify MpEng.exe related errors

Important: Some malware camouflages itself as MpEng.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the MpEng.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


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Best practices for resolving MpEng issues

A clean and tidy computer is the key requirement for avoiding problems with MpEng. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the MpEng.exe process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

MpEng.exe [all]