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Trojan problems


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#1 UsuallyConfused

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Posted 19 June 2012 - 08:55 AM

Hi. Over the weekend, a friend was contacted by her bank fraud department to say that money had been moved via internet banking from her deposit account into her current account and that someone was trying to buy things. The upshot is that nothing has been lost but her 64bit Windows 7 laptop became an obvious focus for a trojan that might have passed on information.

I started the laptop but within a minute, a message saying that "Windows had encountered a critical problem and would restart in one minute" came up. I tried shutdown -a to try and abort it but a message was shown saying that "a system shutdown is in progress (1115)" and I have been unable to stop the shutdown. I have also tried booting into Safe mode but the same happens, so I have been unable to run any of the normal anti-virus or anti-malware programs.

I therefore created a Windows Defender Offline CD and booted into this. On a quick scan, it finds Trojan:Win64/Sirefef.Y but when I try and remove it, it shows an error, saying that it has "encountered the following error: Error code 0x800704ec. This program is blocked by group policy."

As you can see, I appear to be stuck, unless either I can stop the restart or get an offline program that can remove the Trojan.

Can anyone suggest a way forward?

Thank you.


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#2 boopme

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Posted 19 June 2012 - 11:44 AM

Hello, with this infectiona nd what it is doing.. I would feel it important to oonsider this first.

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.
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#3 UsuallyConfused

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Posted 19 June 2012 - 12:05 PM

I would counsel you to disconnect this PC from the Internet immediately.

Thanks for the reply. The laptop has been disconnected since the hack was discovered.

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.

Interesting thought and I can see exactly why this might be the right attitude to take. However, even if it ends up being reformatted, I would still like to try and solve the rebooting issue and the Windows Defender issue for future reference.




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