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I have reason to believe that my Steam install has been infected with a Bitcoin mining virus. 

The Program will run fine for a few minutes then extreme screen stutter and my fans will kick up to full speed. A brief flash in Task Manager shows 100% GPU use by SteamClient.exe. I've tried several approaches to remove this virus will no luck. Including Complete re-install of Steam and several free malware removal programs with no luck. 

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Hello, Welcome to Malwarebytes.
I'm nasdaq and will be helping you.

If you can please print this topic it will make it easier for you to follow the instructions and complete all of the necessary steps in the order listed.

ATTENTION: System Restore is disabled
Turn System Restore ON for Drives in Windows 10 - Immediately.

Remove these programs in bold via the Control Panel > Programs. ...
Browser Extensions (HKU\S-1-5-21-1484513856-4144660855-3524518695-1001\...\{3A787631-66A2-4634-B928-A37E73B58FB6}) (Version: - Spigot, Inc.) <==== ATTENTION
TotalAV (HKLM-x32\...\TotalAV) (Version: 4.12.10 - TotalAV)

Please download the attached Fixlist.txt file to  the same folder where the Farbar tool is running from.
The location is listed in the 3rd line of the FRST.txt log you have submitted.

Run FRST and click Fix only once and wait.

The tool will create a log (Fixlog.txt) please post it to your reply.

Please post the Fixlog.txt and let me know what problem persists.


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