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Need advice on how to remove a Trojan horse BackDoor.Generic14.CDMG virus please

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2 replies to this topic

#1 SherrieB


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Posted 18 December 2011 - 08:52 AM


I know that similar problems to this have been posted on this forum, but I don't want to assume that the procedure for resolving this is the same. Could someone help me please?

I am running Windows Vista on my HP laptop, with AVG free-edition 2012.

My laptop did a scan today, and I got the following message, telling me that it's infected with the above named virus, but AVG cannot remove/heal it as it relates to a white-listed critical\system file.

In case it's relevant, I don't have any of the original software disks for my laptop.

Here's the info.

Object name - C:\Windows\System32\drivers\dfsc.sys
Detection name - Trojan horse BackDoor.Generic14.CDMG
Object type - file
SDK Type - Core
Result - Object is white-listed (critical\system file that should not be removed)

I'd be grateful for some advice on how to resolve this - I am not at all technical, so would appreciate some really idiot-proof guidance please.

By the way, although I have this virus, AVG is still telling me that I am protected. Is it OK to continue to use the computer?

Thanks so much,


Edited by SherrieB, 18 December 2011 - 08:52 AM.

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#2 narenxp


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Posted 18 December 2011 - 10:04 AM

That looks like zero access rootkit.Wait for senior senior BC members to assist you

Good luck

#3 boopme


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Posted 18 December 2011 - 05:00 PM

Hello and welcome.

One or more of the identified infections is a backdoor trojan.

This allows hackers to remotely control your computer, steal critical system information and download and execute files.

I would counsel you to disconnect this PC from the Internet immediately. If you do any banking or other financial transactions on the PC or if it should contain any other sensitive information, please get to a known clean computer and change all passwords where applicable, and it would be wise to contact those same financial institutions to apprise them of your situation.

Though the trojan has been identified and can be killed, because of it's backdoor functionality, your PC is very likely compromised and there is no way to be sure your computer can ever again be trusted. Many experts in the security community believe that once infected with this type of trojan, the best course of action would be a reformat and reinstall of the OS. Please read these for more information:

How Do I Handle Possible Identify Theft, Internet Fraud and CC Fraud?
When Should I Format, How Should I Reinstall

We can still clean this machine but I can't guarantee that it will be 100% secure afterwards. Let me know what you decide to do.

If you decide to clean then we need a deeper look. Please go here....
Preparation Guide ,do steps 6 - 9.

Create a DDS log and post it in the new topic explained in step 9,which is here Virus, Trojan, Spyware, and Malware Removal Logs and not in this topic,thanks.
If Gmer won't run,skip it and move on.
Include a link back to this topic.

Let me know if that went well.
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