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Possible Trojan Infection


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#1 villants7

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Posted 27 September 2009 - 11:31 AM

Recently I downloaded a codec to view video on windows media player. It seems that the codec was a fake or infected though. After some searching I found that I had a file called b.exe on my computer. I followed some of the forums and was able to find it and run superantispyware on it and delete it.

This didn't fix the problem though. Whatever this file is, it has targeted any security measures I try to use. It has stopped McAfee from scanning as well as Avast, Superantispyware, and Malwarebytes. I am unable to scan my computer with any of these as all will begin a scan and then after about 10 secons will disappear. When I try to reopen any of these programs to try again I get error messages saying "Windows can not access the specified device path or file." I tried renaming the files to abcd.exe as some forums mentioned and the file would open but still not scan.

I have uninstalled and reinstalled all of these files and have tried working in safe mode as well.

I am running Windows XP Professional on my computer. Please help as I don't know what else to do. If you need any information just let me know. Thanks.

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#2 boopme

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Posted 27 September 2009 - 01:19 PM

Hello you have been hit with a backdoor malware W32/Sdbot-XK. ASome advice first on these backdoor /bots. a.exe is an Email worm.
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.


The first removal step is
Download this Utility and save it to your Desktop.
Double-click the Utility to run it and and let it finish.
When it states Finished! Press any key to exit, press any key to close the program.
It will save a .txt file to your desktop automatically. Double-click on the Win32kDiag.txt file that is located on your Desktop and post the entire contents of that log as part of the reply in the topic you will create below..
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