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What does it mean if a file is signed with a broken digital signature?

  1. #1


    Join Date : Jul 2010
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    What does it mean if a file is signed with a broken digital signature?

    I scanned my computer with AVG (Which just recently has been acting funny), and I found and deleted a bunch of tracking cookies, but there were a hand full of files that I don't think were infected, but it said next to them that "The file is signed with a broken digital signature" Does anyone know what that means, and how to fix it?
    Thanks! O h and most of those files were from C:\WINDOWS\Installer

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  2. #2
    richc46's Avatar



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    Re: What does it mean if a file is signed with a broken digital signature?

    Per AVG this is for information only
    The file is signed with a broken digital signature
    The reported file was signed with a digital certificate ensuring its integrity. However due to changes to it, the certificate no longer corresponds with the content. This might happen when file is infected but also when it was incorrectly updated, broken due to some error or when the digital signature expired.


    Make sure that you run a full, updated AVG scan
    Download and run malwarebytes; full and upated scan
    If all is negative, you are ok.
    http://www.malwarebytes.org/mbam.php

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  3. #3


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      Thread Starter

    Re: What does it mean if a file is signed with a broken digital signature?

    I went to that AVG link and it said what may be causing the problem. Do you know how to fix this problem?

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  4. #4
    richc46's Avatar



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    Re: What does it mean if a file is signed with a broken digital signature?

    Actually I do. Most times it is a problem with AVG 9.0
    go back to 8.5
    or
    Unistall and use Microsoft Security Essentials. Which is made just for Windows
    I use MSE, Malwarebytes and the Windows Firewall.

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  5. #5


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    Re: What does it mean if a file is signed with a broken digital signature?

    I updated AVG about a week or so ago, and ever since then, when I scan something when it counts the files that it scans, it jumps like from 2 hundred something, all the way into the 7 or 8 thousands. so last night I uninstalled it and re downloaded it and reinstalled it, and the problem was still there. so I used the system restore on my computer, and restored it to about 2 months ago, and then it wouldn't let me uninstall AVG, so I had to undo the system restore, and ever since then I scanned twice and both times I had a hand full of files in C:\WINDOWS\Installer that were signed with a broken digital signature.

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  6. #6
    richc46's Avatar



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    Re: What does it mean if a file is signed with a broken digital signature?

    Make a system restore point
    Then uninstall
    and then
    try Microsoft Security Essentials
    Cant uninstall
    Use the AVG unistall tool
    and
    Try revno uninstaller
    and/or
    try in safe mode

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  7. #7


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    Re: What does it mean if a file is signed with a broken digital signature?

    Well I don't have time now. Im gonna try that tommorrow, and let you know what happends. Thanks

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  8. #8
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    Re: What does it mean if a file is signed with a broken digital signature?

    You are very welcome

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  9. #9



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    Re: What does it mean if a file is signed with a broken digital signature?

    You say that you have a handful. The C:\Windows\Installer folder is quite delicate. If you can, would you mind uploading the log? It will look like it means nothing, as they are likely to be CLSIDs (long strings of random numbers) but we may actually be able to make sense of them. Suppose that they all originate from one program. Re-install that one program?

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  10. #10


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    Re: What does it mean if a file is signed with a broken digital signature?

    Quote Originally Posted by niemiro View Post
    You say that you have a handful. The C:\Windows\Installer folder is quite delicate. If you can, would you mind uploading the log? It will look like it means nothing, as they are likely to be CLSIDs (long strings of random numbers) but we may actually be able to make sense of them. Suppose that they all originate from one program. Re-install that one program?
    Well I uninstalled AVG so I don't have the log anymore, but maybe you can tell me why when AVG was scanning my computer, as it was counting the objects is scanned it jumped from like 2 or 3 hundred all the way to like 7000. I think it only started doing that when I updated to 9.0. I was just wondering if that was something with AVG 9.0 or with my computer. I'm going to try going back to 8.5 when I get a chance. been very busy lately.

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