Robert Hensing's Blog

Software Security . . . and stuff.

GMER discovers a new MBR based rootkit in the wild . . .

GMER discovers a new MBR based rootkit in the wild . . .

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EDITED: 1/10/2008 to remove information about possibly using ntbtlog.txt to detect the rootkit.  The driver load routine for the rootkit seems to be non-standard and thus unlikely to appear in ntbtlog.txt

You can read the gory details of it here: http://www2.gmer.net/mbr

Some things I'd like to point out:

  1. To open a disk for raw disk access (i.e. the method by which you can write to a raw disk sector) requires admin rights.  If you run as non-admin or are on Vista with UAC this malware won't be able to modify your MBR
  2. To fix a modified MBR you can use the Windows Recovery Console and use the 'fixmbr' command.  You boot the recovery console by using your Windows CD / DVD.  So the fact that this malware doesn't use any registry based ASEPs, is actually a pretty big weakness - it makes it easier to defeat. :)

I believe our own AV team will be posting additional technical details in their blog real soon now. :)

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