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Probably a rootkit, AVs keep warning but can't fix


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2 replies to this topic

#1 Maomao

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Posted 27 October 2011 - 02:33 AM

I have something very persistent on my Windows 7 system. When I googled for the symptoms the ZeroAccess rootkit was mentioned, so that could be it.

Windows version: 64-bit Windows 7 Ultimate ver 6.1, build 7600, with several components removed from the installation with W7 Toolkit and vLite. I did a fresh install only a week ago and have only installed some software and device drivers. I haven't noticed any slowdowns, the system is very snappy.

Symptoms: When I installed AVG, it kept warning about the file C:\Windows\SysWOW64\vbgyfuqv.dll, which it wanted to remove but couldn't, so it kept warning every 1-2 minutes. When scanning the whole system, it found infections in a bunch of .exe-files in C:\Windows\Temp\assembly, and also said that a few applications I use were infected and were to be removed after reboot, such as Chrome.exe and VMware.exe. However, when I rebooted, they weren't removed.
At this point I thought there was a problem with AVG finding false positives everywhere, uninstalled it, and got Avast instead. Avast hasn't mentioned vbgyfuqv.dll, but it keeps blocking some Win32:DNSchanger process from trying to access some suspicious URLs I haven't heard of; also it blocks new files in C:\Windows\Temp\assembly\*random characters*\ every few minutes. These files seem to be created when I start new processes. For instance, I just downloaded TDSS Killer from Kaspersky (anti-rootkit tool), and when running it, Avast said this program's process was trying to create more of those files. It (TDSS) didn't find any infections.
At some point, I remember either AVG or Avast reported a file called kwrd.dll.
Also, Windows Update has started to fail, there are 4 important updates I can't download. Also when I reboot, Windows complains that my HP HD Fixed WebCam driver failed to install. Windows update was supposed to do this for me, maybe the rootkit is hiding in this driver or something.
I have scheduled boot-time scans with Avast and run them a few times, but they just find and delete the same two files in C:\Windows\Temp\assembly each time and doesn't stop the weird behavior, also those files keep coming back.

I would like to know whether a file shield such as AVG's resident shield, or the one Avast provides, would have prevented the rootkit from being installed, even though they apparently can't remove it. In that case, I will install an AV earlier next time I reinstall.

I would greatly appreciate if someone could help me remove this thing!

Edited by Maomao, 27 October 2011 - 09:51 PM.


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#2 Broni

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Posted 27 October 2011 - 08:48 PM

With the information you have provided I believe you will need help from the malware removal team.
Please make sure that you read the information about getting started first.
Then start a new thread HERE and include or required logs.
Including a link to this thread will be helpful.

Good luck and be patient. Help is on the way!

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#3 Orange Blossom

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Posted 28 October 2011 - 10:56 AM

Hello,

Now that you have posted a log here: http://www.bleepingcomputer.com/forums/topic425390.html 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 MRT Team member, nor should you ask for help elsewhere. Doing so can result in system changes which may not show in 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 MRT 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 MRT Team members are EXTREMELY 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 MRT 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 MRT Team member is already assisting you and not open the thread to respond.

Please be patient. It may take several days to get a response but your log will be reviewed and answered as soon as possible. I advise checking your topic once a day for responses as the e-mail notification system is unreliable.

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

To avoid confusion, I am closing this topic. Good luck with your log.

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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