Firefox.exe suddenly only 2 k (and IE 1 KB) & flagged up as a malware

January 13 (2015), I was surprised to find my anti-virus (Pure 3.0 at the time) Kaspersky software tracking upward of what follows as a malware (trojan):

Firefox.exe C:\Program Files\Mozilla Firefox\firefox.exe HOUR: Trojan.WinLNK.StartPage.gena
Iexplore.exe C:\Program may Explorer\iexplore.exe TIME: Trojan.WinLNK.StartPage.gena
eBay Sidebar for Sidebar C:\Users\David\Desktop\eBay Firefox.lnk for Firefox.lnk HOUR: Trojan.WinLNK.StartPage.gena

I followed the instructions to the quarantine and re - start. No problem. After re-booting, I couldn't access Firefox and discovered that he had indeed been quarantined - with IE (which I use rarely) and eBay Sidebar for Firefox (which I have not used for a long time). On the restoration of these, they are still identified as malware. Further investigation revealed that firefox.exe was only 2 KB - and that is only 1 KB.

Kaspersky was advised to switch to total security, that I did and it has continued to identify the files as malware. Full virus controls, including safe mode, is not revealed. Run a suite of recommended anti-malware programs don't have pick up a limited number of bits and pieces (and I deleted) that Kaspersky has not, although my research on the net pointing everything be the kind of things that produce advertisements on browsers... not something that would erase or rename programs (I don't see bad ads though, perhaps because of my settings in Firefox Kaspersky and NoScript).

Kaspersky feels firefox.exe has been altered (on 2 k, it is certainly not right) - Although that corrupt is another question. All other files \Mozilla Firefox seem to be there, and I have no problem with other software or files on my PC (just those three). Again the same thing happened to IE at the same time. That is a hard drive failing very little likely indeed - but it makes me suspicious that there was * something * deliberately made that Kaspersky did not pick up. However, it would be unusual for decent antivirus software like Kaspersky miss something. In addition, the same question must occur widely around the same time, because if everyone around the world lost their browsers he would have made the news - not to mention advertising malware that corrupts the two browsers being rather doomed to failure!

Either way, the desktop shortcuts have been replaced by the Windows icon by default for programs that do not have a shortcut to measure. And by clicking on what was the shortcut of Firefox opens a DOS window, which closes immediately; IE does the same thing but a "16-bit MS-DOS Subsystem" error box appears (these are the days!) with:
C:\Users\Public\Desktop\Internet client.lnk
NTVDM CPU has encountered an invalid statement.
CS: 123f IP:012d OP: 8f 9f af 6th ba choose 'Close' to terminate the application.
[By clicking on 'Close' or 'ignore' both close BACK - and that's it.] [No virus or something similar is picked up and four anti-malware programs, I am using now show that my system is clean.

So my questions are:
(1) any thoughts on what happened?
(2) I need to get Firefox working again. Can I simply copy firefox.exe from another machine and replace the existing 2 k firefox.exe and everything should be good, as it was before... or it is not as simple as that? (I understand that Firefox keeps preferences, etc., in separate files).

Thanks in advance for your comments.

Dave

Sorry, you had this problem

It my be possible and work if you replace the firefox.exe problem

However that could cause problems and the solution would be to download and install Firefox again by an official site, and by using a pure install involving the removal of the existing program files. (Care to leave the files and folders from one Firefox profile. In fact, it would be interesting, as a precaution suspenders belts ; Locate and save first)

As to what happened, you gave a well-reasoned and intelligent summary, but after the event, it's going to is almost impossible to define. Sometimes the AV brand and/or & false positives especially temporarily if not totally updated.

Clean reinstall it

Some Firefox problems can be solved by performing a clean reinstall. This means that you remove Firefox program files, and then reinstall Firefox. Please follow these steps:

Note: You can print these steps or consult them in another browser.

  1. Download the latest version of Firefox from mozilla.org office (or choose the download for your operating system and language on this page) and save the file to install it on your computer.
  2. Once the download is complete, close all Firefox Windows (or open the Firefox menu

    Click the close button

    ).

  3. Remove the Firefox installation folder, which is located in one of these locations, by default:
    • Windows:

      • C:\Program Files\Mozilla Firefox
      • C:\Program Files (x 86) \Mozilla Firefox
    • Mac: Delete Firefox in the Applications folder.
    • Linux: If you have installed Firefox with the distribution-based package manager, you must use the same way to uninstall: see Install Firefox on Linux. If you have downloaded and installed the binary package from the Firefox download page, simply remove the folder firefox in your home directory.
  4. Now, go ahead and reinstall Firefox:
    1. Double-click on the downloaded Setup file and go through the steps in the installation wizard.
    2. Once the wizard is completed, click to open Firefox directly after clicking the Finish button.

More information on the resettlement of Firefox can be found here.

WARNING: Do not use an uninstaller to third parties as part of this process. This could permanently delete your Firefox profile data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and passwords saved. They can be retrieved easily unless they have been backed up on an external device!

Tags: Firefox

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