Applocker “MpSigStub.exe”

The Windows anti-malware solution, Windows Defender, which has been  installed on every version of Windows since Windows 7, is responsible  for protecting the system from malware. Windows Defender runs in the  context of NT AUTHORITY\SYSTEM and spawns a process named MpSigStub.exe, both of which are used by the Windows update service.

You will need to whitelist this .exe from Running

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