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Combofix Misuse, Boot troubles


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#1 Dumbificate

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Posted 30 August 2011 - 12:39 PM

TLDR version: Used combofix in an attempt to remove a rootkit on a laptop. After rebooting from the finish prompt, computer only boots into startup repair/recovery mode. Can still access data through the recovery console, however, I do not see a combofix log in the main directory. Startup repair runs repeatedly without finding any fixable errors. Version of combofix used is the most recent as of 08/30/2011(downloaded from this site). OS in question is Vista 32bit.

Please let me know what other information I need to provide to be helpful.

Thanks for any and all help.

EDIT: Repair install option not available from the vista disc. The Vista installation is recognized from the install disc search, but bootrec /scanos does not find any installations from the recovery console, which seems odd.

-C

Edited by Dumbificate, 30 August 2011 - 12:42 PM.


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#2 Elise

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Posted 30 August 2011 - 01:45 PM

Hello, is this a 32 bit or 64 bit Vista installation?

regards, Elise


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#3 Dumbificate

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Posted 30 August 2011 - 01:49 PM

Os in question is Vista 32bit.

#4 Elise

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Posted 30 August 2011 - 01:50 PM

TLDR version:

What do you mean by this and what rootkit were you attempting to remove (try to be as detailed as possible).

regards, Elise


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#5 Dumbificate

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Posted 30 August 2011 - 01:53 PM

Tldr is equivalent to the short version. I had a Google redirect virus, and one of the solutions I found involved combofix. I do not recall which rootkit combo detected.

#6 Elise

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Posted 30 August 2011 - 02:14 PM

In that case lets see what we can find out.

Try this please. You will need a USB drive.

Download GETxPUD.exe to the desktop of your clean computer
  • Run GETxPUD.exe
  • A new folder will appear on the desktop.
  • Open the GETxPUD folder and click on the get&burn.bat
  • The program will download xpud_0.9.2.iso, and upon finished will open BurnCDCC ready to burn the image.
  • Click on Start and follow the prompts to burn the image to a CD.
  • Remove the USB & CD and insert it in the sick computer
  • Boot the Sick computer with the CD you just burned
  • The computer must be set to boot from the CD
  • Gently tap F12 and choose to boot from the CD
  • Follow the prompts
  • A Welcome to xPUD screen will appear
  • Press File
  • Expand mnt
  • sda1,2...usually corresponds to your HDD
  • sdb1 is likely your USB
  • Click on the folder that represents your USB drive (sdb1 ?)
  • Press Tool at the top
  • Choose Open Terminal
  • Type the following and press enter:

    dd if=/dev/sda of=mbr.bin bs=512 count=1

  • Press Enter
  • After it has finished a file will be located on your USB drive named mbr.bin
  • Remove the USB drive and insert it back in your working computer and navigate to mbr.bin, zip it up and attach it to your next reply.

This will allow me to have a look at the MasterBootRecord of your drive and see if it is infected.

regards, Elise


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#7 Elise

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Posted 20 September 2011 - 04:39 AM

Due to the lack of feedback, this topic is now closed.In the event you still have problems, please send me or any Moderator a Private Message and ask them to reopen this topic within the next 5 days. Please include a link to your topic in the Private Message. Thank you.

regards, Elise


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