What is MsMpEng.exe?

MsMpEng.exe is part of Windows Defender and developed by Microsoft Corporation according to the MsMpEng.exe version information.

MsMpEng.exe's description is "Service Executable"

MsMpEng.exe is digitally signed by Microsoft Corporation.

MsMpEng.exe is usually located in the 'C:\Program Files\Windows Defender\' folder.

None of the anti-virus scanners at VirusTotal reports anything malicious about MsMpEng.exe.

If you have additional information about the file, please share it with the FreeFixer users by posting a comment at the bottom of this page.

Vendor and version information [?]

The following is the available information on MsMpEng.exe:

Product nameWindows Defender
Company nameMicrosoft Corporation
File descriptionService Executable
Internal nameMsMpEng.exe
Original filenameMsMpEng.exe
Legal copyright© Microsoft Corporation. All rights reserved.
Product version1.1.1593.0
File version1.1.1593.0

Here's a screenshot of the file properties when displayed by Windows Explorer:

Product nameWindows Defender
Company nameMicrosoft Corporation
File descriptionService Executable
Internal nameMsMpEng.exe
Original filenameMsMpEng.exe
Legal copyright© Microsoft Corporation. All right..
Product version1.1.1593.0
File version1.1.1593.0

Digital signatures [?]

MsMpEng.exe has a valid digital signature.

Signer nameMicrosoft Corporation
Certificate issuer nameMicrosoft Code Signing PCA
Certificate serial number61469ecb000400000065

VirusTotal report

None of the 50 anti-virus programs at VirusTotal detected the MsMpEng.exe file.

None of the 50 anti-virus programs detected the MsMpEng.exe file.

Folder name variants

MsMpEng.exe may also be located in other folders than C:\Program Files\Windows Defender\. The most common variants are listed below:

Hashes [?]


Error Messages

These are some of the error messages that can appear related to msmpeng.exe:

msmpeng.exe has encountered a problem and needs to close. We are sorry for the inconvenience.

msmpeng.exe - Application Error. The instruction at "0xXXXXXXXX" referenced memory at "0xXXXXXXXX". The memory could not be "read/written". Click on OK to terminate the program.

Service Executable has stopped working.

End Program - msmpeng.exe. This program is not responding.

msmpeng.exe is not a valid Win32 application.

msmpeng.exe - Application Error. The application failed to initialize properly (0xXXXXXXXX). Click OK to terminate the application.

What will you do with MsMpEng.exe?

To help other users, please let us know what you will do with MsMpEng.exe:

What did other users do?

The poll result listed below shows what users chose to do with MsMpEng.exe. 15% have voted for removal. Based on votes from 27 users.

User vote results: There were 4 votes to remove and 23 votes to keep

Malware or legitimate?

If you feel that you need more information to determine if your should keep this file or remove it, please read this guide.

Please select the option that best describe your thoughts on the information provided on this web page

Free online surveys

And now some shameless self promotion ;)

A screenshot of FreeFixer's scan result.Hi, my name is Roger Karlsson. I've been running this website since 2006. I want to let you know about the FreeFixer program. FreeFixer is a freeware tool that analyzes your system and let you manually identify unwanted programs. Once you've identified some malware files, FreeFixer is pretty good at removing them. You can download FreeFixer here. It runs on Windows 2000/XP/2003/2008/2016/2019/Vista/7/8/8.1/10. Supports both 32- and 64-bit Windows.

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Please share with the other users what you think about this file. What does this file do? Is it legitimate or something that your computer is better without? Do you know how it was installed on your system? Did you install it yourself or did it come bundled with some other software? Is it running smoothly or do you get some error message? Any information that will help to document this file is welcome. Thank you for your contributions.

I'm reading all new comments so don't hesitate to post a question about the file. If I don't have the answer perhaps another user can help you.

Joe Kendrick writes

0 thumbs

I have an issues with this file hogging my Ram and Disc. I have tried many things to disable it, none worked. Scanned with Malwarebytes not identified. My computer is so slow it is worthless. I have looked for a solution for 2 days.
Please help.
In the file:
C:\ProgramData\Microsoft\Windows Defender\Platform\4.12.17007.17123-0

# 12 Dec 2017, 10:39

Roger Karlsson writes

0 thumbs

@Joe: The MsMpEng.exe file listed here is part of Windows Defender. It's a legitimate file.

I cannot say for sure about the MsMpEng.exe file on your computer, so I recommend that you upload it to http://www.virustotal.com and have it scanned by the anti-virus programs there.

Please let us know what you find out.

# 26 Dec 2017, 7:29

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