Windows 10: My USB stick was infected and I accidentally clicked on the only file visible on it

Vibe Knight · Oct 3, 2023

The file is a shortcut with following path: C:\Windows\system32\cmd.exe /c start rundll32 \cbfecbfecbfcbfecbfecbfecbfecbfecbfecbfecbfecbfecbfecbfbcb.cbfecbfecbfcbfecbfecbfecbfecbfecbfecbfecbfecbfecbfecbfbcb,GEcyVrPlIeCYvJazI've already scanned everything with malwarebytes and windows defender and got no detections.

:)

Ulysses · Oct 3, 2023

USB stick infected?

Your USB drive looks encrypted to me. If you didn't do this then you've probably been a victim of some form of ransomware attack. Ransomware attacks work by forcing the encryption of certain files the malware wants to target, usually ones that have the most value, and then extort the victim into paying to have the contents decrypted. In other cases it may just be someone messing around who wanted to cause you stress and anxiety by simply encrypting your drive so you can no longer use it. What you are looking at there is likely your files in encrypted form.

Also, why are you running USB's given to you? You should NEVER trust a USB stick that you yourself have not before had posession of and/or bought brand new and can vouch for the original condition it was in. Just plugging in USB sticks is really really REALLY bad practice. You're asking for trouble. You should never do it. USB drives are among the MOST common form of medium to launch malware attacks from because they can be customized to a high degree in order to do the bidding of the bad guy and also because most computers by default accept and even auto-run USB sticks. This means as soon as it is plugged in often Windows will automatically open and/or run the autoplay script on the stick which then starts the process of hacking the target computer. USB sticks are also frequently used in what are called 'bad USB' attacks whereby the USB pretends to be a trusted device a computer automatically allows to run on the computer without question.

They are frequently used to hack computers and here you are using them without questioning it. Look at these storage devices like you look at diseases. Are you spreading a disease by using it? Is the storage device clean? How do you know? Who has it come from? Do you trust them? Always suspect the worst when using someone else's USB stick. I would potentially run it in a virtual machine environment alongside HiJackThis or some reasonable tool for analysing running processes. You'll likely see a whole array of processes start followed by changes to the drive and/or the computer running the USB stick. At least in a virtual machine environment the changes are reversible and/or insignificant. If you see activity on your network after running the USB stick you know it's been compromised. Setup a decent firewall to notify you of all connections and then see what happens.

Either way you should NEVER use someone else's USB stick without knowing to a very high degree the stick you're using is not infected. Because the amount of infections that occur with USB sticks is very high and like mentioned above, is one of the most common attack vectors because you're often overriding security practices and/or basic protections by connecting the USB stick physically to the computer where it is the most vulnerable. Physical attacks are by the hardest to prevent.

Just be way more careful next time and make sure you don't go doing this sort of stuff at work and/or anywhere else otherwise you could be the guy who helps to cause a sh*t storm.
Click to expand...

Thanks for your such informative suggestions.

i will be more careful about such sticks. i never connect others stick to my PC.

what should i do now to be clear that my PC is not effected?

how to see activite on my network?

p.s. i will run windows on VM and will check stick on there right?

Adam · Oct 3, 2023

usb stick pretends to be empty after worm

I plugged my USB stick in an infected PC(did not know that at first) and then back to my PC. When I plugged it in my PC, Windows-Defender poped up and showed a serious warning:

Worm:Win32/Gamarue.gen!Ink

Completed action: quarantine
Click to expand...

Now when I click at the USB device it is shown empty, although if I do rightclick and options I see that it is still 150 MB occupied, so I guess there are still the files on the USB stick. I plugged the USB device back into the infected PC and there the files were visible.

I am now in the situation that I only have the USB stick left and no access anymore to the infected PC. Is there any chance that I can recover the "hidden" files on the USB stick withouth infecting my PC?

Ulysses · Oct 3, 2023

USB stick infected?

Hello ten community,

When i connected my USB stick on PC ( windows LTSC v.1809) got such weird folders.

please see attached screenshot.

I had it formatted before and nowhere connected till today.

whats that?

p.s. is any solutions to avoid PC infections from USB? when i connect USB stick i have always pressed on shift button and after will connect a sticks.
how is possible clean USB from virus by CMD without losing data inside?

sometimes i got a USB sticks from user's with shortcut inside and all data is hiden or something like it.

thanks for ur time.

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