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Rootkit in MBR:\\.\physicaldevice0


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#1 G2442g

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Posted 11 September 2011 - 06:19 PM

Avast detected a rootkit in MBR:\\.\physicaldevice0.
Avast recommended to remove it and do a scan on reboot, so I took of for a while to watch some television while the startup scan was running.
When I got back there was a screen that said Windows couldn't start up so I had to use system restore... I ran another scan and the rootkit was still there. According to the scan it created a log file, but since the restore point I chose was created during the installation of Avast and Avast was removed by the system restoration, there is no log file from it to upload.

Thing is, because I had a lot of registry errors I set my computer back to factory settings earlier today, but there was some interruption during the re-installation I didn't pay enough attention to.
I assume the rootkit was on my computer BEFORE re-installing it too, because I still have the same issue I described in this topic http://www.bleepingcomputer.com/forums/topic418481.html, which might be a symptom of that rootkit (?).

Anyway, how do I get rid of this thing and make sure I can get my computer to normal again (I don't care for re-installing again, as long as I know for sure that the problem (probably just that rootkit) will be gone after that).

Other things indicating problems besides the Avast detection:
- Checkdisk gave me a WARNING: F PARAMATER NOT SPECIFIED when I ran a scan after re-installation
- SFC /SCANNOW in command prompt indicated that there were some registry errors that couldn't be fixed. Unfortunately, when I tried to open the log file it told me "acces denied".
- The USB-format problem described here http://www.bleepingcomputer.com/forums/topic418481.html
- The "f parameter" error showed up before re-installing when I tried to switch on system restore which for some reason was turned of (not sure if it was done by the malware or something really stupid I did to make my computer lose less disk space or keep it faster or something).

Info:
- I've a Sony Vaio running Vista 32 bit

Right now I'll keep my laptop on stand by, because there is a new popup from Avast telling me it's recommended to remove it and restart my computer again. But since that didn't work out about one and a half hour ago I think I'll wait until I get some help here... :P
EDIT: I decided to let Avast give it another try, it said it would remove it, but when vista started up it said my computer had been succesfully restored to yesterday evening's restore point (I didn't have to choose to use system restore, it automatically did it). A new scan showed the rootkit is still there, so Avast didn't do anything useful.

Edited by G2442g, 12 September 2011 - 03:13 AM.


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#2 Orange Blossom

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Posted 12 September 2011 - 05:07 AM

Hello,

Please follow the instructions in ==>This Guide<==. If you cannot complete a step, skip it and continue.

Once the proper logs are created, then make a NEW TOPIC and post it ==>HERE<== Please include a description of your computer issues and what you have done to resolve them.

If you can produce at least some of the logs, then please create the new topic and explain what happens when you try to create the log(s) that you couldn't get. If you cannot produce any of the logs, then still post the topic and explain that you followed the Prep. Guide, were unable to create the logs, and describe what happens when you try to create the logs.

If HelpBot replies to your topic, PLEASE follow Step One so it will report your topic to the team members.

Orange Blossom :cherry:
Help us help you. If HelpBot replies, you MUST follow step 1 in its reply so we know you need help.

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#3 G2442g

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Posted 12 September 2011 - 02:18 PM

Hello,

Please follow the instructions in ==>This Guide<==. If you cannot complete a step, skip it and continue.

Once the proper logs are created, then make a NEW TOPIC and post it ==>HERE<== Please include a description of your computer issues and what you have done to resolve them.

If you can produce at least some of the logs, then please create the new topic and explain what happens when you try to create the log(s) that you couldn't get. If you cannot produce any of the logs, then still post the topic and explain that you followed the Prep. Guide, were unable to create the logs, and describe what happens when you try to create the logs.

If HelpBot replies to your topic, PLEASE follow Step One so it will report your topic to the team members.

Orange Blossom :cherry:


Thank you!
All logs could be created, this is the new topic: http://www.bleepingcomputer.com/forums/topic418682.html

#4 boopme

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Posted 12 September 2011 - 02:48 PM

Thank you.
Now that your log is properly posted, you should NOT make further changes to your computer (install/uninstall programs, use special fix tools, delete files, edit the registry, etc) unless advised by a Malware Removal Team member, nor should you continue to ask for help elsewhere. Doing so can result in system changes which may not show it the log you already posted. Further, any modifications you make on your own may cause confusion for the helper assisting you and could complicate the malware removal process which would extend the time it takes to clean your computer.

From this point on the Malware Removal Team should be the only members that you take advice from, until they have verified your log as clean.

Please be patient. It may take a while to get a response because the Malware Removal Team members are very busy working logs posted before yours. They are volunteers who will help you out as soon as possible. Once you have made your post and are waiting, please DO NOT make another reply until it has been responded to by a member of the Malware Removal Team. Generally the staff checks the forum for postings that have 0 replies as this makes it easier for them to identify those who have not been helped. If you post another response there will be 1 reply. A team member, looking for a new log to work may assume another MRL Team member is already assisting you and not open the thread to respond.

To avoid confusion, I am closing this topic.
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