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Windows 7: USB flash shows symptoms of infection but none detected

19 Nov 2015   #1

Windows 7 Ultimate x64 SP1
USB flash shows symptoms of infection but none detected


A few minutes ago I copied a movie from my in-laws laptop into my USB flash containing portableapps launcher and other folders and files, but when I immediately opened the usb flash in windows explorer, I noticed that all my files and folders were not there except what can be seen in the attached image. So I immediately closed the windows explorer and scanned the usb flash first with AVG Internet Security and because nothing was detected, I then scanned it again with Malwarebytes Antimalware but it found nothing too. During the scanning of both security tools, I could see that all my files and folders were put into .Trashes folder.

Anyone with and idea or opinion or advice, please do help me out.

Best and God bless,


Attached Thumbnails
USB flash shows symptoms of infection but none detected-infection-sympton.jpg  
My System SpecsSystem Spec
19 Nov 2015   #2

Windows 7 Ultimate x64 SP1

oh! And yes, both my security tools are up-to-hour if you will.
My System SpecsSystem Spec
19 Nov 2015   #3

Windows 7 Ultimate x64

I agree that something definitely smells bad. For one, there is an "autorun.inf" file, a file typically used to exploit a serious Windows vulnerability (the autorun "feature"). Then there is a misterious "bat.bat" file. And a couple of shortcuts pointing to who knows where, presumably taking place of the original files. To me it's clear that the pendrive at least touched an infected computer.

I wonder where do the shortcuts point to, and what the bat file and autorun actually do. But most likely there is something bad inside that trash folder, maybe a malware plus backups of your files. I would simply not take chances, just reformat the drive right away and restore whatever was there from backups. Other than satisfying curiosity I see little value in peeking around, specially considering Windows loves to run the autorun thing without consent.

BTW, don't put too much faith in antiviruses. They're completely unreliable since years ago. A bit of common sense plus a good configuration is far more useful, as you've seen detecting the malware by yourself
My System SpecsSystem Spec


 USB flash shows symptoms of infection but none detected

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