A virus remnants

Hi all,

Lately a pc here had an infected usb flash drive infect it - each usb that was inserted to it would only show a shortcut inside it & its content would disappear.

While trying to clean the pc I've found a file named obupnitujr.exe under C:\Users\username\AppData\Roaming with a shortcut to it at C:\Users\username\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup.

The file is about 70 Mb & we would be very happy to get to the bottom of this & understand what it was exactly doing.

Is there a way for us to analyze the file? (notepad would show random characters)

Thanks in advance!
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Make sure you have a good antivirus installed and run a scan on it.  There are also online antivirus programs that will help you do this.  For example, you can try TrendMicro's AV:


But if you're having doubts and don't know what it's for, simply deleting the program would be the safe thing to do.  I would also do a fully system scan to be safe, and let your users know not to download random files or follow links in emails.
meirgilAuthor Commented:
The thing is - non of the AVs I've used to scan this specific file show it as a virus :s
Sounds like the infection spoof all or part of the USB device driver so when you plug in a usb drive it may actually be kicking of the Trojan, can you remove the file or does it keep coming back if you remove it? try tdskiller scan to check for rootkits, if that still comes up clean your next step would be to run a offline scan from something like Kaspersky av rescue disk download on a clean system and create the bootable cd boot on the suspect system and update its dat and scan the drive.

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I would delete it then, or at least rename the file extension to something non-executable to avoid accidentally running it.
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