Firefox pref.js detected and PUP.optional.WinYahoo

[DroidKing23]

So malwarebytes kept finding this PUP, was detecting the pref.js file as a PUP.optional.WinYahoo. so i went in to the directory and manually deleted the pref.js.copy file and now mbam doesn't find it which is good i guess but im wondering, firefox can sync preferences tomy Firefox Synce account , will it sync or backup this infected? pref.js file? so if i ever reinstall windows and firefox will it import the infected file again?. idk how it became a PUP im guessing i installed some trash software that did it.

Edited September 17, 2017 by DroidKing23

[kevinf80]

Hello DroidKing23 and welcome to Malwarebytes, My screen name is kevinf80, i`m here to help clean up your system. Make sure to run all scans from accounts with Administrator status, continue as follows please: Anyone other than the original starter of this thread please DO NOT follow the instructions and advice posted as replies here, my help and advice is NOT related to your system and will probably cause more harm than good... Make a "Clean" install Firefox: Use the following link for instructions how to back up your bookmarks, same link can be used to import saved Bookmarks: https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer Next, Remove all synced data from Firefox to stop possible re-infection or exploitation. https://support.mozilla.org/t5/Sync-and-Save/How-do-I-set-up-Sync-on-my-computer/ta-p/21417 Next, Go here: http://www.mozilla.org/en-US/ download save the latest version of Firefox.. We will install this later... Next, Lets totally remove Firefox and start over. Go here: https://support.mozilla.org/en-US/kb/uninstall-firefox-from-your-computer and follow those instructions... Ensure when the uninstall completes to navigate to and delete the firefox installation folder (if present): (32-bit Windows) C:\Program Files\Mozilla Firefox (64-bit Windows) C:\Program Files (x86)\Mozilla Firefox It is essential the installation folder is removed. Re-boot your system when that is completed.... Next, To remove all remaining data and profile information... Press "Windows key + R" to open the Run box In the Run box, type in or copy and paste %APPDATA% Click OK. A Windows Explorer window will appear. In this window, choose/open in succession Mozilla > Firefox > Profiles. Select Delete on each entry in reverse, eg Profiles > Delete. Firefox > Delete. Mozilla > Delete. Re-boot your system when complete! Next, Use the Mozilla Firefox installer to reinstall your Browser.... When Firefox is installed and open select these keys together :- Ctrl - Shift - A that will access Addons manger, this gives access to find addons/extensions, use, start, stop or disable those features etc.... Ensure to use search to find and install AdBlock plus, Flashblock and DrWeb Anti-Virus Link Checker plus any other addons you normally use.... Now try surfing, see what happens...   Let me know if you have any remaining issues or concerns...   Thank yo,   Kevin....

[kevinf80]

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[kevinf80]

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