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What is MpSigStub.exe?

MpSigStub.exe is a executable file (a program) within Windows. The filename extension .exe denotes an executable file. You should only run executable files from publishers you trust, because executable files can potentially change your computer settings or harm your computer. The free file information forum can help you determine if MpSigStub.exe is a virus, trojan, spyware, or adware that you can remove, or a file belonging to a Windows system or to an application you can trust.

MpSigStub.exe file information

The process known as Microsoft Malware Protection Signature Update Stub belongs to software Microsoft Malware Protection by Microsoft (www.microsoft.com).

Description: MpSigStub.exe is not essential for Windows and will often cause problems. The file MpSigStub.exe is located in a subfolder of C:\. Known file sizes on Windows 7/XP are 237,072 bytes (33% of all occurrences), 232,336 bytes or 273,840 bytes. http://www.file.net/process/mpsigstub.exe.html 
The program is not visible. It is not a Windows core file. The software has no file description. Therefore the technical security rating is 49% dangerous, however also read the users reviews.

Recommended: Identify MpSigStub.exe related errors

If MpSigStub.exe is located in the folder C:\Windows\System32, the security rating is 36% dangerous. The file size is 237,072 bytes (50% of all occurrences) or 221,568 bytes. The program has no visible window. It is certified by a trustworthy company. The file is not a Windows core file.

Important: Some malware camouflages itself as MpSigStub.exe, particularly when located in the c:\windows or c:\windows\system32 folder. Therefore, you should check the MpSigStub.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.


User Comments

The Forefront Client Security Antimalware Service updates the anti-malware engine files and the anti-malware definition files without leaving a gap in malware protection.
  Neil Tunnah   (further information)
It is part of the Windows Automatic Update tool.
  Sean Smith  
MpSigStub.exe is a Microsoft installer application used in conjunction with Windows Automatic Updates. It extracts update files to a temporary directory.
Microsoft Malware Protection Signature Update Stub
  Microsoft MVP   (further information)
It is required for Microsoft Windows Defender and I believe it is also needed for Microsoft Malware Removal Tool that is updated monthly. It is not Virus, Malware, Trojan, etc. When detected as such, report it as a false positive.
  Jenni L   (further information)
MpSigStub.exe is a MS installer application used in conjunction with Windows Automatic Updates. It extracts update files to a temporary directory.
  Alex   (further information)
MS Defender, MSMWRT, & Panda Cloud AV don't detect; McAfee does
stored in a random folder (in my case: E:\63bf18e751d3d39be7b19e12)
It was flagged by Bullguard as suspicious as it attempted to make a registry change
it is in a long random named folder started 2 days ago, i do not need it before so its trash
stored in an invisible folder on external hard drive I pluged in 3 secondes earlier, then realized it was the wrong hardrive, and tried to eject it. Zentimo said MpSigStub.exe was preventing the drive from ejecting, because it was running from a folder that did not exixt on the hard drive.
I believe there is a "real" file names MPSigStub" however mine was located in a random letter/number filename... deleted

Rating chart

Summary: Average user rating of MpSigStub.exe: based on 14 votes with 12 user comments.
6 users think MpSigStub.exe is essential for Windows or an installed application. 2 users think it's probably harmless. 3 users think it's neither essential nor dangerous. One user suspects danger. 2 users think MpSigStub.exe is dangerous and recommend removing it. 3 users don't grade MpSigStub.exe ("not sure about it").

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MpSigStub scanner

Security Task Manager shows all running Windows tasks including embedded hidden functions (e.g. keyboard or browser monitoring, autostart entry). A unique security risk rating indicates the likelihood of the process being potential spyware, malware, keylogger or a Trojan.

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Other processes

MpSigStub.exe [all]