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Zero Access G Rootkit

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3 replies to this topic

#1 Skirmish


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Posted 21 November 2011 - 10:22 PM

Hi everyone, I've been fighting this rootkit for a while and run out of ideas. I searched and ended up coming here - most people with zero access were recommended to contact a tech before doing anything so here we go. I initially had sophos, that detected a threat but let it through. I've since removed sophos and installed a trial of kaspersky which is doing a little better, but not a lot.
Originally the virus interfered with the alcohol 120% virtual scsi driver and BSOD'd windows every time it started - i fixed that by going into save mode and removing the driver.
I've run Kaspersky rescue disk, virus removal tool and antivius 2011 with latest database. Originally the behaviour was that the files were locked and couldn't be removed (even when booting of a bootcd like WinXP portable). One of the files was C:\Windows\assembly\gac_msil\desktop.ini but a whole bunch of system restore folder files were infected as well.
I ran rkill, and it was denied access to a whole bunch of processes. Then rkill.com, rkill.exe got infected.
I've also run MBAM, I don't remember it picking anything up actually. At least I haven't seen MBAM get infected.
Somehow I managed to get rid of the virus - at least it wasn't showing up under any scans.
Everything looked good until just this morning when a BSOD was caused by a kaspersky system file. Virus is back. I scanned again, but now whenever a file is found and tried to be disinfected, it disappears before the antivirus program can clean it. I actually saw this happen to two files (rkill.exe, rkill.com) on the desktop. KAV picked them up as infected, then BAM, they both disappeared & KAV reports the files as missing, not disinfected. This also happened in the KAV logs for a file that needed the PC to be rebooted to be cleaned - KAV couldn't find the file on reboot to clean it. The file that was infected then vanished was C:\Windows\system32\drivers\mrxsmb.sys, it was reported as being infected with Rootkit.Win32.ZAccess.g .
Thanks for your help guys! I really don't know what else to do now.

I'm running WinXP 32bits SP3. Currently have Kaspersky Antivirus 2011 with latest database, latest version of Malwarebytes Anti Malware and database and the latest verison of rkill available.

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#2 Broni


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Posted 21 November 2011 - 11:08 PM

Please follow the instructions in ==>This Guide<== starting at Step 6. 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, what you have done to resolve them, and a link to this topic.

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.

It would be helpful if you post a note here once you have completed the steps in the guide and have started your topic in malware removal. Good luck and be patient.

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

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#3 Skirmish

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Posted 22 November 2011 - 01:32 AM

Thanks Broni! I'll let you know how I go. Much appreciated.

#4 hamluis



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Posted 22 November 2011 - 07:01 AM

New topic at http://www.bleepingcomputer.com/forums/topic428870.html/page__p__2482959#entry2482959 .

Now that you have posted a log, reflected in link above, you should NOT make further changes to your computer[/color][/b] (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.


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