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Quick computer virus question

Discussion in 'General Chat' started by teddieriley, Sep 3, 2008.

  1. teddieriley

    teddieriley Distinguished Member

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    Wait, you smell that?
    I got some sort of virus on my windows-based laptop a while ago. It used to cause IE to continually open new windows to the point I couldn't close them fast enough. I uninstalled IE, and now use Firefox. For web browing purposes, it seems fine, although I know the operating system is jacked.

    Question: If I were to buy a portable hard drive to transfer just my old school files (mostly word docs), music files, and pic files for eventual transfer to a new computer, could those sort of files be infected so as to contaminate a new computer? I'm also just thinking of transferring these files to a portable hard drive and re-formatting my laptop to eliminate performance issues and transferring back. Not sure if viruses typically just infect executables rather than .doc, .mpg, .jpgs.
     


  2. EL72

    EL72 Distinguished Member

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    I'm no expert in these matters but I believe the answer is no, your documents should be clean.
     


  3. feynmix

    feynmix Distinguished Member

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    I got some sort of virus on my windows-based laptop a while ago. It used to cause IE to continually open new windows to the point I couldn't close them fast enough. I uninstalled IE, and now use Firefox. For web browing purposes, it seems fine, although I know the operating system is jacked.

    Question: If I were to buy a portable hard drive to transfer just my old school files (mostly word docs), music files, and pic files for eventual transfer to a new computer, could those sort of files be infected so as to contaminate a new computer? I'm also just thinking of transferring these files to a portable hard drive and re-formatting my laptop to eliminate performance issues and transferring back. Not sure if viruses typically just infect executables rather than .doc, .mpg, .jpgs.


    i think i have got the same thing (not as frequent as yours), and I am trying to catch it but no luck so far. I have been running adaware and virus checks, but nothing yet.
     


  4. binge

    binge Distinguished Member

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    You should be safe. There are viruses for Word docs and other non-executables. Such viruses will attached to say a Word doc then use the MS Word macro/script feature to propagate itself. But, in order for those viruses to be executed, their files have to be opened in their respective programs.

    The safest course of action would be do:
    1. Install a virus scanner on current (possibly infected) PC and virus check files to be backed-up
    2. Back up files to external storage
    3. Wipe computer and re-install from scratch
    4. Install virus scanner on new OS of computer right away
    5. Scan it
    6. Scan those backed-up files on external storage
    7. Restore files from external storage

    Yes, that's a pretty paranoid set of steps, but there are a few remote attacks to guard against. Some viruses can install payloads in the hard drives MBR (master boot record) which is typically not over-written by a disk format and OS re-install -- for Windows at least. So, even if you re-install Windows and re-format the drive, the previous MBR will likely remain intact, and if that is infected, then the virus will persist. I believe any decent up-to-date virus scanner will also cover the MBR.

    In a similar fashion, there is an outside possibility that your external storage could be infected with a virus as well. If the external storage is a USB drive, then it could be infected in a similar fashion to the MBR. It's not quite the same as you don't boot off the USB drive, but if Windows does the stupid "autorun.exe" type stuff, then a virus could put one
    of those files on the external drive and if Windows auto-runs it, then you're screwed. The same logic applies to a CD/DVD.

    One option is to FTP your files up to some web site. That way you don't have to worry about a USB drive or DVD/CD getting infected in any way. Sure, your files could still be carrying viruses, but at least the external storage won't be compromised.

    If your virus scanning software has a boot disk (such as CD/DVD) where you can boot directly off of it, use it. This way, the virus scanning software can scan the hard drive before anything it run from it. This will help better detect an MBR infection on the hard drive.

    Although the most common viruses are attached to executable files, they can certainly also be attached to non-executables. For example, with Word files, viruses are basically Word macros/scripts. They run when Word opens the file and they often infect other Word files. More pernicious are viruses that attach to media files and use attacks such as buffer-overflows to run their executable payload. Such a virus could infect a MPEG, but then install an executable virus in the MBR.

    That said, for all but the most compromised systems, you should be fine with: virus scan, backup, re-install, virus scan backup, then restore.
     


  5. sleekblackroadster

    sleekblackroadster Senior Member

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    i constantly reformat and reinstall windows. and i backup all my files on externals.

    you should be okay.

    binge has imo a great methodology spelled out for you to follow.
     


  6. teddieriley

    teddieriley Distinguished Member

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    Wait, you smell that?
    yup. thanks guys, especially Bing for the insightful info. Hopefully I don't have anything so insiduous, but that is what worries me. The only thing I really care about are my pics. Music I can live without, but nice to have. But I suppose I can just buy the external HD and leave my files on there and run everything off that HD instead of doing the transfer.
     


  7. Huntsman

    Huntsman Distinguished Member

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    yup. thanks guys, especially Bing for the insightful info. Hopefully I don't have anything so insiduous, but that is what worries me. The only thing I really care about are my pics. Music I can live without, but nice to have. But I suppose I can just buy the external HD and leave my files on there and run everything off that HD instead of doing the transfer.
    While virii are typically not in document/non-system files, files can masquerade with the wrong extensions...
     


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