It exists to be downloaded with a packed file ("mrt.exe._p"), containing an updated version of the free Microsoft Malicious Software Removal Tool (MSRT), into a randomly-named folder at the root level, (e.g., "C:\d2c6febc4a2e9369b5ee1d\mrtstub.exe"), where it executes and unpacks "mrt.exe" into "C:\Windows\System32" for use. "Mrtstub.exe" is a benign Microsoft file. The genuine mrtstub.exe file is a software component of Malicious Software Removal Tool by Microsoft Corporation.
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