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Cryptojacking using the System process and Runtime broker


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Hello 

I recently got a VR headset and I have been having significant performance drops around 5 min after I start to play. At first I thought my pc wasn't powerful enough but it bugged me that it dropped only after a few minutes while working very well before. 

So I did some research and found out that some malwares could manifest themselves if there were no mouse or keyboard input for some time. 

So I opened task manager, let it run for a few minutes and then my processor got from 6% to 60%. The processes working were System and a Runtime broker associated with Windows Photo. I also did it with Wireshark to try to understand what is being transmitted but it's not very clear. 

I did some scans with Malware Bytes but it found nothing and RKiller found 1 registery key threat but it did not solve the problem. 

Farbar scan showed some '<=Attention' but I don't know what they mean. 

 

Can someone help me with this? 

Thanks. 

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  • Root Admin

Hello @Kyershey

Please go to Control Panel, Programs, Programs and Features and uninstall the following

Java 8 Update 261

 

 

What is in this batch file?

Startup: C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup\fcbd.bat [2017-07-01] () [Fichier non signé]

 

 

Please download the attached fixlist.txt file and save it to the Desktop or location where you ran FRST from.
NOTE. It's important that both files, FRST or FRST64, and fixlist.txt are in the same location or the fix will not work.

Please make sure you disable any real time antivirus or security software before running this script. Once completed make sure you re-enable it.

NOTICE: This script was written specifically for this user, for use on this particular machine. Running this on another machine may cause damage to your operating system that cannot be undone.

Run FRST or FRST64 and press the Fix button just once and wait.
If the tool needs a restart please make sure you let the system restart normally and let the tool complete its run after restart.
The tool will make a log on the Desktop (Fixlog.txt) or wherever you ran FRST from. Please attach or post it to your next reply.

Note: If the tool warned you about an outdated version please download and run the updated version.

NOTE-1:  This fix will run a scan to check that all Microsoft operating system files are valid and not corrupt and attempt to correct any invalid files. It will also run a disk check on the restart to ensure disk integrity. Depending on the speed of your computer this fix may take 30 minutes or more.

NOTE-2: As part of this fix all temporary files will be removed. If you have any open web pages that have not been bookmarked please make sure you bookmark them now as all open applications will be automatically closed. Also, make sure you know the passwords for all websites as cookies will also be removed. The use of an external password manager is highly recommended instead of using your browser to store passwords.

The following directories are emptied:

  • Windows Temp
  • Users Temp folders
  • Edge, IE, FF, Chrome and Opera caches, HTML5 storages, Cookies and History
  • Recently opened files cache
  • Flash Player cache
  • Java cache
  • Steam HTML cache
  • Explorer thumbnail and icon cache
  • BITS transfer queue (qmgr*.dat files)
  • Recycle Bin

Important: items are permanently deleted. They are not moved to quarantine. If you have any questions or concerns please ask before running this fix.

The system will be rebooted after the fix has run.

fixlist.txt

Thanks

 

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Okay so I did the steps and it seems to have worked! 

I don't really know if it was a malware or just some corrupted files because the sfc scan restored some. 

The fcbd.bat was associated with an old game I don't play anymore so I deleted it. 

 

Thank you so much for the help!

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I think my fixlog.txt file got rewritten because I ran  the fix a second time.

The first time I forgot to turn off my antivirus and I saw that the chkdsk command did not work because my system is in french, so I executed the command myself before running the fix the 2nd time.

I only thought afterwards of saving the file..

Fixlog.txt MalwareBytesLog.txt

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  • Root Admin

Thank you for the update and feedback

We should probably run another AV scan just to make sure

 

Let me have you run a different scanner to double-check. I don't expect it to find anything, but no harm in checking.

I would suggest a free scan with the ESET Online Scanner

Go to https://download.eset.com/com/eset/tools/online_scanner/latest/esetonlinescanner.exe

  • It will start a download of "esetonlinescanner.exe"
  • Save the file to your system, such as the Downloads folder, or else to the Desktop.
  • Go to the saved file, and double click it to get it started. 
  • When presented with the initial ESET options, click on "Computer Scan".
  • Next, when prompted by Windows, allow it to start by clicking Yes 
  • When prompted for scan type, Click on Full scan 
  • Look at & tick  ( select )   the radio selection "Enable ESET to detect and quarantine potentially unwanted applications"   and click on Start scan button.
  • Have patience.  The entire process may take an hour or more. There is an initial update download.
  • There is a progress window display.
  • You should ignore all prompts to get the ESET antivirus software program.   ( e.g.  their standard program).   You do not need to buy or get or install anything else.
  • When the scan is completed, if something was found, it will show a screen with the number of detected items.  If so, click the button marked “View detected results”.
  • Click The blue “Save scan log” to save the log.
  • If something was removed and you know it is a false finding, you may click on the blue ”Restore cleaned files”  ( in blue, at bottom).
  • Press Continue when all done.  You should click to off the offer for “periodic scanning”.

 

 

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  • 3 weeks later...
  • Root Admin

Due to the lack of feedback, this topic is closed to prevent others from posting here.

If you need this topic reopened, please send a Private Message to any one of the moderating team members. Please include a link to this topic with your request.

This applies only to the originator of this topic. Other members who need assistance please start your own topic in a new thread.

Tips to help protect from infection

Thanks

 

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