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I have an USB drive which I know is virus infected (an anti-virus on my friend's machine detected it). Unfortunately neither of us know the virus name and I don't want to take the risk of plugging it to my Windows box again.

Of course, in all probability the virus affects only Windows. (But I'm not sure) I want to know if I can safely plug the USB into my Ubuntu Lucid laptop and copy the stuff I need from the drive. If there are some precautions I need to follow what would they be?

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3 Answers 3

up vote 9 down vote accepted

Linux systems usually do not execute code from a USB stick when just connecting it. Thus copying stuff from it should be safe.

Keep in mind that the copied files may contain malicious code. For example, some evil java-script inside a html file or an evil office-script inside you word/open-office-writer documents. That means, you should be careful with these files - don't open these files with programs that are known to execute embedded scripting code.

Well, and don't directly execute binary executables that are copied from that stick.

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Javascript in HTML files can not harm your system because they can't access anything outside of a browser. The worst that can happen is that there is an intentional infinite loop that eats CPU (then you just close the browser). –  dv3500ea Sep 21 '10 at 17:01
    
@dv3500ea that's not entirely true. The JavaScript could execute an exploit in an number of softwares other than the browsers (Flash, Java, etc) that ends up infecting a computer. However - the likelihood of it being an infection for Linux computers is very slim. Linux has the mantra "Security through obscurity". With such a relatively small market share most viruses are produced for Windows machines not Linux. –  Marco Ceppi Sep 21 '10 at 17:06
    
@dv3500ea: for an example how java-script can harm you - check out en.wikipedia.org/wiki/Cross-site_scripting and get scared ;) Sure, your system is not necessarily harmed, but perhaps some homebanking data is transfered ... –  maxschlepzig Sep 21 '10 at 17:17
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@Marco Ceppi: Linux does not have any security-by-obscurity mantra. Linux systems implement a lot of stuff that goes quite in the opposite direction: user separation, make it hard to surf as root, convenient system wide security upgrading including application programs, a major ban on proprietary software, etc. And keep in mind that the market share of linux is quite different between the (web-)server and desktop market. –  maxschlepzig Sep 21 '10 at 17:26
    
Thanks folks. Also installed NoScript as a result :) –  suhridk Sep 21 '10 at 17:37

Viruses that work on Linux are rare, but they do exist. I would recommend scanning the USB volume with ClamTk (It's just called "Virus Scanner" in Software Center). This will help you to identify the virus, which may be useful information. You might consider re-scanning the volume after reformatting it as well. It's probably overkill, but it shouldn't take long.

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Useful tip. ClamTk would not install on my system due to some locale issues with Perl. However I Googled and found BitDefender. They provide a software repository for easy installation as well. Bitdefender quickly identified the Trojan - (It was lurking inside an mp3 file) and offered to clean/delete/quarantine. So this might be a good solution for those who want to use Ubuntu to clean up their Windows drives/partitions safely. –  suhridk Sep 22 '10 at 7:21

There is very little to worry about. Just copy the files you need to your laptop then format the drive. Don't copy files if you don't know what they are because these are likely to be the virus. Make sure you don't execute anything on the drive just to be safe.

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There is nothing wrong with just copying a file, even a virus file. It only has an effect when you execute it. You just have to make sure that, in the process of copying the file, the OS doesn't also execute it without your permission. (Linux systems in general are usually relatively good about only running things when explicitly asked to.) –  David Z Sep 21 '10 at 20:11
    
The idea was to leave infected files on the drive so that they are deleted when it is reformatted. –  dv3500ea Sep 21 '10 at 21:01

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