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mscorsvw.exe taking up a lot of CPU

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#1 unfortunatefool


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Posted 30 December 2014 - 08:54 PM

Oh no!


After receiving a windows update that took forever to load and install, I now have mscorsvw.exe running at a high CPU rate and more updates to install from Windows. I am now running in safe mode.


This seems very fishy.  I'm pretty good at checking the Task Manager and there are entirely new with processes going up by the moment.  Please, please help.


Thanks so much.





P.S.  I have MBAM and Microsoft Security Essentials installed.

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#2 buddy215


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Posted 30 December 2014 - 09:11 PM

Sounds like poweliks. MBAM has had success removing it.

You may be blocked from updating MBAM and scanning with it by the malware.

Try running a scan after updating MBAM and see if it finds and removes poweliks.

If you have run a scan already and it did not find poweliks then use the Eset Poweliks Tool.


Please download Powelikscleaner (by ESET) and save it to your Desktop.

  • Double-click ESETPoweliksCleaner.exe to start the tool.
  • Read the terms of the End-user license agreement and click Agree if you agree to them.
  • The tool will run automatically. If the cleaner finds a Poweliks infection, press the Y key on your keyboard to remove it.
  • If Poweliks was detected "Win32/Poweliks was successfully removed from your system" will be displayed. Press any key to exit the tool and reboot your PC.
  • Let me know if poweliks was found and removed as shown in the bottom image.



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#3 quietman7


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Posted 30 December 2014 - 09:57 PM

After receiving a windows update that took forever to load and install, I now have mscorsvw.exe running at a high CPU rate and more updates to install from Windows. I am now running in safe mode.

Was one of the updates related to .NET Framework? If so, this is FYI...

Mscorsvw.exe is a legitimate process that is part of the Microsoft .NET Runtime Optimization Service. The file is used to precompile Microsoft .NET framework assemblies in the background and used by programs requiring .NET Framework. Microsoft released Article ID: 2571181 advising that a computer can stop responding in some cases if you install .NET Framework 4 or when the .NET Runtime Optimization Service starts.

The .NET Framework Optimization Service typically runs when the .NET Framework is installed on a computer or when the .NET Framework is serviced by Windows Update. If you install any .NET Framework updates, it is not uncommon after the patch is installed for mscorsvw.exe to show high amounts of CPU usage for a short duration..
However, if there are entirely new with processes showing up that needs to be investigated.
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