Win32/Mebroot trojan

Discussion in 'Malware Help (A Specialist Will Reply)' started by swordmaster2551, Jul 13, 2010.

  1. swordmaster2551

    swordmaster2551 Private E-2

    I've done some searching and all the fixes I found don't work.

    I'm running Windows Vista and have followed the malware removal guide, but nod32 is still picking up this trojan but is unable to get rid of it, in addition an iexplore.exe process keeps popping up although I am not running internet explorer.

    Operating memory - Win32/Mebroot trojan - action selection postponed until scan completion
    is what I get specifically

    Here are the logs I've collected, any help would be greatly appreciated
     

    Attached Files:

  2. swordmaster2551

    swordmaster2551 Private E-2

    Here is the combofix log
     

    Attached Files:

  3. TimW

    TimW MajorGeeks Administrator - Jedi Malware Expert Staff Member

    You need to tell me the exact path to the file that NOD is picking up.

    In the meantime, use windows explorer to find and delete:
    c:\users\Celine\AppData\Local\kejkreixp
    C:\Windows\temp\100.dat

    Now use the below instructions to reset your proxy settings:
    Change Proxy Settings.
     
  4. swordmaster2551

    swordmaster2551 Private E-2

    Here is the log from NOD

    As far as I can see it doesn't list a path.
     

    Attached Files:

  5. TimW

    TimW MajorGeeks Administrator - Jedi Malware Expert Staff Member

    No, that isn't any help at all.


    • Download bootkit_remover.rar
    • Click the underlined DOWNLOAD text to download the file and save it to your Desktop.
    • You then need to extract the remover.exe file from the RAR using a program capable of extracing RAR compressed files. If you don't have an extraction program, you can use 7-Zip
    • After extracing remover.exe to your Desktop, double click the remover.exe file to run the program.
    • Attach or post inline here, the output from remover.exe

    NOTE: The Command Prompt window text can be copied to the clip board by right clicking on the top bar of the window and using the Edit commands to Mark, Copy, and Paste.
     
  6. swordmaster2551

    swordmaster2551 Private E-2

    Here are the logs I got
     

    Attached Files:

  7. TimW

    TimW MajorGeeks Administrator - Jedi Malware Expert Staff Member

    Let's try a different tool to check:

    Please also download MBRCheck to your desktop

    * Double click MBRCheck.exe to run (vista and Win 7 right click and select Run as Administrator)
    * It will show a Black screen with some information that will contain either the below line if no problem is found:

    • Done! Press ENTER to exit...
    * Or you will see more information like below if a problem is found:

    • Found non-standard or infected MBR.

    • Enter 'Y' and hit ENTER for more options, or 'N' to exit:
    * Either way, just choose to exit the program at this point since we want to see only the scan results to begin with.
    * MBRCheck will create a log named similar to MBRCheck_07.16.10_00.32.33.txt which is random based on date and time.
    * Attach this log to your next message.
     
  8. swordmaster2551

    swordmaster2551 Private E-2

    Here's the log
     

    Attached Files:

  9. TimW

    TimW MajorGeeks Administrator - Jedi Malware Expert Staff Member

    Do you have all important data backed up? You really should do this before continuing since we will need to rewrite your MBR to fix this and while most times this can be done without any problem, these infections can react badly and that could result in a PC not being bootable. You really don't have much choice though since these infections are too dangerous to your security to leave on a PC.

    Also note if you have a Dell PC which uses a non-standard MBR ( or another manufacturer's who does similar to Dell) , fixing the mbr may prevent access the the Dell Restore Utility, which allows you to press a key on startup and revert your computer to a factory delivered state. There are a couple of known fixes for said condition, though the methods are somewhat advanced. If you are unwilling to take such a risk, you should not continue but you risk serious problems leaving this infection in place and thus your only other option would be to try using the Dell Restore Utility to return a factory ship state which will remove everything you additional you have put onto the PC.


    Now if you wish to continue and fix the malware - please do the following:

    * Run MBRCheck.exe
    * Wait until you see the following lines:
    o Enter 'Y' and hit ENTER for more options, or 'N' to exit:
    o Options:
    [1] Dump the MBR of a physical disk to file.
    [2] Restore the MBR of a physical disk with a standard boot code.
    [3] Exit.
    Enter your choice:

    * Please push the 'Y' key and then press Enter
    * When the program asks you to Enter your choice: enter 2 to Restore the MBR and press the Enter key
    * Now the program will ask you to "Enter the physical disk number to fix (0-99, -1 to cancel):"

    • Enter 0 and press the Enter key.
    * The program will show Available MBR codes as below

    * You need to select your version of Windows from the list. For example, enter 0 or 1 for XP or enter 3 for Vista.....etc. and then press Enter.
    * The program will prompt for confirmation. Type 'YES' and hit Enter.
    * Left click on the title bar (where program name and path is written). From menu chose Edit -> Select All
    * You will see all the text in the window get highlighted.
    * Hit the Enter key on your keyboard to copy all of the text into the clipboard.
    * Paste that text into Notepad, save it to your desktop as MBRfix.txt
    * Restart your PC.
    * Attach the MBRfix.txt file to your next message..
     
  10. swordmaster2551

    swordmaster2551 Private E-2

    Here's the log
     

    Attached Files:

  11. TimW

    TimW MajorGeeks Administrator - Jedi Malware Expert Staff Member

    Please attach either a new MGLogs.zip or re-run the MBRCheck.exe and attach that log.

    Tell me how things are running.
     

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