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Flashing command prompt window intermittently


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Last week my son made a slideshow for his aunt using pirated software he downloaded via torrents. One was Adobe Premiere and the other was by Movavi.

Since then, I have seen what looks like a command prompt window flash quickly every so often. I uninstalled the software since then and ran Malwarebytes and the antivirus that comes with Windows 10. Several pieces of malware were found and quarantined. My son may have tried a few other malware programs and installed and uninstalled malwarebytes more than once. I don't believe any logs have been saved as the trash bin has been deleted. Now I still get a flashing screen about every few minutes or so, but it is so quick it can't even be identified as a command prompt. 

Any help would be appreciated.

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Hiya xrayvision and welcome to Malwarebytes,

Thanks for those logs, continue:

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 FRSTEnglish, and fixlist.txt are in the same location or the fix will not work.

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Note: If the tool warned you about an outdated version please download and run the updated version.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

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 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.

user posted image

The system will be rebooted after the fix has run.

Next,

Please download AdwCleaner by Malwarebytes and save the file to your Desktop. https://downloads.malwarebytes.com/file/adwcleaner
  • Right-click on the program and select Run as Administrator to start the tool.
  • Accept the Terms of use.
  • Wait until the database is updated.
  • Click Scan Now.
  • When finished, please click Clean & Repair.
  • Your PC should reboot now if any items were found.
  • After reboot, a log file will be opened. Copy its content into your next reply.
Next,

Download "Microsoft's Safety Scanner" and save direct to the desktop

Ensure to get the correct version for your system....

https://docs.microsoft.com/en-us/windows/security/threat-protection/intelligence/safety-scanner-download


Right click on the Tool, select Run as Administrator the tool will expand to the options Window
In the "Scan Type" window, select Quick Scan
Perform a scan and Click Finish when the scan is done.


Retrieve the MSRT log as follows, and post it in your next reply:

1) Select the Windows key and R key together to open the "Run" function
2) Type or Copy/Paste the following command to the "Run Line" and Press Enter:

notepad c:\windows\debug\msert.log

The log will include log details for each time MSRT has run, we only need the most recent log by date and time....

Let me see those logs in your reply...

Thank you,

Kevin.

fixlist.txt

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Thanks for the help, Kevin. 😊

I first want to let you know that I may have “fixed” the issue of the flashing screen (maybe by doing something I shouldn't have?).

I noticed upon a restart that another black screen flashed, but for a longer amount of time. I was able to video it and pause on the screen so I could read it.

The first line was “Microsoft .NET Framework Assembly Registration Utility version 4.8.4084.0.”

The file path on the border of the screen was in AppData\Roaming\tthibct

I deleted “tthibct” and the screen no longer flashes regularly nor upon start-up.

 

After running AdwCleaner, my system did not reboot, but there were two log files. I have attached them both.

Fixlog.txt AdwCleaner[C00].txt AdwCleaner[S00].txt msert.log

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Hiya xrayvision,

Good to hear your PC is ok for you, continue to finish up:

Right click on FRST here: C:\Users\xray\Desktop\FRST.exe and rename uninstall.exe when complete right click on uninstall.exe and select "Run as Administrator"

If you do not see the .exe appended that is because file extensions are hidden, in that case just rename FRST to uninstall

That action will remove FRST and all created files and folders...

Next,

Remove all System Restore Points: https://www.tenforums.com/tutorials/33593-delete-system-restore-points-windows-10-a.html#option2

Create clean fresh Restore Point: http://www.thewindowsclub.com/create-system-restore-point

Run Windows Disk Clean Up Utility - https://neosmart.net/wiki/disk-cleanup/

Condsider the following:

Disable Remote Desktop: https://www.tenforums.com/tutorials/92433-enable-disable-remote-desktop-connections-windows-10-pc.html

Disable Windows Telemetry: https://helpdeskgeek.com/windows-10/how-to-disable-windows-10-telemetry/

Malwarebytes Browser Guard (Free) for Firefox: https://addons.mozilla.org/en-GB/firefox/addon/malwarebytes/

Malwarebytes Browser Guard (Free) for Chrome: https://chrome.google.com/webstore/detail/malwarebytes-browser-guar/ihcjicgdanjaechkgeegckofjjedodee Will also work for Opera and Edge..

PatchMyPC, keep all your software upto date - https://patchmypc.com/home-updater#download

From there you should be good to go...

Next,

Read the following links to fully understand PC Security and Best Practices, you may find them useful....

Answers to Common Security Questions and best Practices

Do I need a Registry Cleaner?

Take care and surf safe

Kevin... user posted image

 

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  • Root Admin

Glad we could help.

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 thread. Other members who need assistance please start your own topic in a new thread.

Please review the following for Tips to help protect from infection

Thank you

 

 

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