Malwarebytes Detects 'prefs.js' as a Virus - Help!


  1. Posts : 654
    10
       #1

    Malwarebytes Detects 'prefs.js' as a Virus - Help!


    Malwarebytes detects that my prefs.js is a virus. How is this possible? Should I be concerned? What do i do about this?
      My Computer


  2. Posts : 8,107
    windows 10
       #2

    Its a JavaScript files open it with notepad as it's plain text post what it says as text so we can see
      My Computer


  3. Posts : 6,847
    22H2 64 Bit Pro
       #3

    It probably detected a prefs.js file modified by a dodgy extension.

    Resetting preferences - MozillaZine Knowledge Base

    You could reset Firefox or else navigate to your prefs.js file then right click and choose edit.

    Copy and paste the contents into a reply here.

    Malwarebytes Detects 'prefs.js' as a Virus - Help!-prefs_js.jpg
      My Computer


  4. Posts : 654
    10
    Thread Starter
       #4

    Callender said:
    It probably detected a prefs.js file modified by a dodgy extension.

    Resetting preferences - MozillaZine Knowledge Base

    You could reset Firefox or else navigate to your prefs.js file then right click and choose edit.

    Copy and paste the contents into a reply here.

    Malwarebytes Detects 'prefs.js' as a Virus - Help!-prefs_js.jpg

    Here you go... let me know dude!!


    // Mozilla User Preferences

    // DO NOT EDIT THIS FILE.
    //
    // If you make changes to this file while the application is running,
    // the changes will be overwritten when the application exits.
    //
    // To change a preference value, you can either:
    // - modify it via the UI (e.g. via about:config in the browser); or
    // - set it within a user.js file in your profile.

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    user_pref("services.sync.prefs.lastSync", "1555388284.92");
    user_pref("services.sync.prefs.sync.browser.urlbar.suggest.bookmark", false);
    user_pref("services.sync.prefs.sync.browser.urlbar.suggest.history", false);
    user_pref("services.sync.prefs.sync.browser.urlbar.suggest.openpage", false);
    user_pref("services.sync.prefs.sync.browser.urlbar.suggest.searches", false);
    user_pref("services.sync.prefs.syncID", "mdLZ25lFPmYC");
    user_pref("services.sync.syncInterval", 3600000);
    user_pref("services.sync.syncThreshold", 1000);
    user_pref("services.sync.tabs.lastSync", "1555955737.58");
    user_pref("services.sync.tabs.syncID", "at3deWZCIOjY");
    user_pref("services.sync.username", "I made my email hidden here");
    user_pref("signon.importedFromSqlite", true);
    user_pref("storage.vacuum.last.index", 1);
    user_pref("storage.vacuum.last.places.sqlite", 1554832790);
    user_pref("toolkit.startup.last_success", 1555952105);
    user_pref("toolkit.telemetry.cachedClientID", "c0ffeec0-ffee-c0ff-eec0-ffeec0ffeec0");
    user_pref("toolkit.telemetry.previousBuildID", "20190409155332");
    user_pref("toolkit.telemetry.reportingpolicy.firstRun", false);
    user_pref("toolkit.zoomManager.zoomValues", ".3,.33,.35,.37,.4,.43,.45,.47,.5,.53,.55,.57,.6,.63,.65,.67,.7,.73,.75,.77,.78,.79,.8,.83,.85,.86,. 87,.88,.89,.9,.91,.92,.93,.94,.95,.96,.97,.98,.99,1,1.01,1.02,1.03,1.04,1.05,1.06,1.07,1.08,1.09,1.1 ,1.11,1.12,1.14,1.16,1.17,1.18,1.19,1.2,1.23,1.24,1.25,1.26,1.27,1.28,1.29,1.3,1.33,1.35,1.37,1.38,1 .39,1.4,1.43,1.47,1.5,1.53,1.57,1.6,1.7,2,2.4,3");
    user_pref("ui.osk.debug.keyboardDisplayReason", "IKPOS: Touch screen not found.");
    user_pref("ui.osk.enabled", false);
      My Computer


  5. Posts : 6,847
    22H2 64 Bit Pro
       #5

    I can't see any problem there.

    Suggest - backup profile to a directory outside of Program Files or Appdata - use a folder on your desktop or something.

    Download Hekasoft Backup & Restore 0.81


    You should really also manually make a backup copy of your FF profile:



    1. Press [Windows key+R] on the keyboard. A Run dialog will open.
    2. Type in:
      %APPDATA%\Mozilla\Firefox\Profiles\


    Or else navigate to:

    C:\Users\<Windows login/user name>\AppData\Roaming\Mozilla\Firefox\Profiles\<profile folder>.

    backup these two: (Profiles folder and Profiles.ini file) to a folder on your desktop.
    AppData\Roaming\Mozilla\Firefox\Profiles\
    AppData\Roaming\Mozilla\Firefox\Profiles.ini

    Export your bookmarks as Html file and save the file somewhere.

    Get a copy of GeekUninstaller and run it. https://geekuninstaller.com

    Find Firefox in the list of programs and double click it.
    Choose yes when deleting profile data.
    Allow it to scan for leftovers.
    From the results list delete everything directly related to the Firefox Program installation or application data.

    Reboot when finished.

    Run Cccleaner if you've got a copy. Check here for Firefox leftovers (important) and delete if found:

    C:\Program Files\Mozilla Firefox
    C:\Program Files (x86)\Mozilla Firefox
    Press the [Windows key+R] to open a Run dialog, type in %APPDATA%\Mozilla\ and click OK to open the Mozilla folder, then delete the Firefox folder if found.

    Reboot.

    Download a fresh copy of firefox and install it. Import your bookmarks. Re-add your extensions manually.
      My Computer


  6. Posts : 654
    10
    Thread Starter
       #6

    Callender said:
    I can't see any problem there.

    Suggest - backup profile to a directory outside of Program Files or Appdata - use a folder on your desktop or something.

    Download Hekasoft Backup & Restore 0.81

    .
    Dont you think "pavel.sherbakov@gmail.com" added in the file in the section of ff addon is suspicious?

    Also google is my default search engine. I see several references to 'bing.' Again dont you think thats suspicious also?

    Do you think I should delete all these entries or what do you suggest?
      My Computer


  7. Posts : 6,847
    22H2 64 Bit Pro
       #7

    yahanna said:
    Dont you think "pavel.sherbakov@gmail.com" added in the file in the section of ff addon is suspicious?

    Also google is my default search engine. I see several references to 'bing.' Again dont you think thats suspicious also?

    Do you think I should delete all these entries or what do you suggest?
    The email indicates that you have an FVD Media Inc extension installed. The email belongs to the developer.

    Bing can be removed - it's not suspicious.

    Type about:preferences#search in the address bar. Make sure that bing is non-default then in the search engine list highlight bing and remove.

    Malwarebytes Detects 'prefs.js' as a Virus - Help!-ff-options.jpg

    I would still suggest clean installing firefox and that means removing leftovers after uninstall.
    Last edited by Callender; 22 Apr 2019 at 15:05. Reason: disable smiley
      My Computer


  8. Posts : 6,847
    22H2 64 Bit Pro
       #8

    If you like you could run:

    Wise JetSearch - Free Local File Search Tool for Windows

    In the search box type .xpi

    Malwarebytes Detects 'prefs.js' as a Virus - Help!-wise-jetsearch.jpg

    Try to find the .xpi relating to pavel_sherbakov_gmail_com and if found zip it and upload it here.
      My Computer


 

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