MBR Rootkit found

Discussion in 'Malware Help (A Specialist Will Reply)' started by NetCentric, Mar 11, 2011.

  1. NetCentric

    NetCentric Private E-2

    I've downloaded installed and run the various malware removal software. SAS found Vundo and apparently did away with it. All was looking good until I ran RootRepeal and it appears to have found 2 MBR rootkits on my F and G drives. I'm not really sure what to do now. I've attached the log file. Any help would sure be appreciated.
     

    Attached Files:

  2. chaslang

    chaslang MajorGeeks Admin - Master Malware Expert Staff Member

    Welcome to Major Geeks!


    If you are saying you ran the below procedure


    READ & RUN ME FIRST. Malware Removal Guide

    Then you need to finish 100% of what we asked for and attach the logs from the below:
    • SUPERAntiSpyware
    • Malwarebytes
    • ComboFix
    • MGtools
    In addition to the above, 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. (See: HOW TO: Attach Items To Your Post )
     
  3. NetCentric

    NetCentric Private E-2

    attached log files. Thanks again for your help.
     

    Attached Files:

  4. NetCentric

    NetCentric Private E-2

    MBRCheck log attached also
     

    Attached Files:

  5. chaslang

    chaslang MajorGeeks Admin - Master Malware Expert Staff Member

    I don't think the MBR for this drive is actually infected. It is just not a standard Windows MBR. Likely because of how it was setup/partitioned. For example, below I will show you a log from my system where I just installed a new 2T byte USB external had drive from Verbatim. Notice what it says for the MBR.
    Code:
    MBRCheck, version 1.2.3
    (c) 2010, AD
    Command-line:
    Windows Version:                Windows XP Professional
    Windows Information:            Service Pack 2 (build 2600)
    Logical Drives Mask:            0x000000fd
    [URL="file://\\.\C"]\\.\C[/URL]: --> [URL="file://\\.\PhysicalDrive0"]\\.\PhysicalDrive0[/URL] at offset 0x00000000`01f60800  (NTFS)
    [URL="file://\\.\G"]\\.\G[/URL]: --> [URL="file://\\.\PhysicalDrive2"]\\.\PhysicalDrive2[/URL] at offset 0x00000000`00007e00  (FAT32)
    [URL="file://\\.\H"]\\.\H[/URL]: --> [URL="file://\\.\PhysicalDrive1"]\\.\PhysicalDrive1[/URL] at offset 0x00000000`00007e00  (NTFS)
          Size  Device Name          MBR Status
      --------------------------------------------
        111 GB  [URL="file://\\.\PhysicalDrive0"]\\.\PhysicalDrive0[/URL]   Windows XP MBR code detected
                SHA1: DA38B874B7713D1B51CBC449F4EF809B0DEC644A
       1863 GB  [URL="file://\\.\PhysicalDrive2"]\\.\PhysicalDrive2[/URL]   RE: Unknown MBR code
                SHA1: 639AC5CDF8A5CF3245975932C6A4215450A7B98F
        189 GB  [URL="file://\\.\PhysicalDrive1"]\\.\PhysicalDrive1[/URL]   Legit MBR code detected
                SHA1: 317A49A9E93F077F2D004734D2A7B6CA7E7B9495
     
    Found non-standard or infected MBR.
    Just an unknown form that likely allows use with multiple operating systems ( like Windows and MAC OS ).

    If you are not having malware problems, I would leave it alone.
     

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