What is mpsigstub.exe? 5 ways to see if it’s safe.

What is mpsigstub.exe?

mpsigstub.exe is a Microsoft executable related to updating Microsoft's Windows Security app in Windows 10 or 11. In Windows the .exe is referred to as the Microsoft Malware Protection Signature Update Stub. The official .exe is safe and exists to download and update Windows Security (formerly Windows Defender). What's a stub installer? Stubs are usually partial installers that are used to download the full software and save bandwidth. For example Google's Chrome has a stub installer that you install with Windows that when executed then downloads and installs the full version of Chrome. This way Google can make a very tiny installer for Chrome to get more downloads and installs of their popular browser.

Publisher: Microsoft Corporation

What does mpsigstub.exe do?

mpsigstub.exe updates Windows Security with a stub downloader and updater.

Is mpsigstub.exe safe? 5 easy ways to see if mpsigstub.exe is safe or malware.

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Why does mpsigstub.exe access the network?

mpsigstub.exe accesses the network to install updates for Windows Security using stub technology. We blocked mpsigstub.exe with GlassWire network security and we found it caused no alerts or issues with Windows Security. However, we recommend that this executable remain unblocked since it helps with the security of your PC. When investigating the app we found it connected to a Microsoft cloud server, as we'd expect it would. The server was skypedataprdcolwus15.cloudapp.net in our case and in our geographic location in the USA.

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