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Removing Rootkit Infection

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#1 A Selene

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Posted 10 September 2008 - 10:11 AM

This RootKitRevealer scan was run 9/9/8. The PC is blocking proper installation of Kaspersky AntiVirus. There is a uwzfqas.sys file visible in Windows Explorer in the C:\Windows\System32 folder that cannot be copied or zipped -- "file cannot be found", but it can be seen in Windows Explorer.

One poster at SYSINTERNALS agrees this looks like a RootKit. He suggested SDFIX, COMBOFIX and Superantispyware as possible removers. FWIW, this thing has survived multiple COMBOFIX and MALWAREBYTES runs. It's still there and still lethal.

Does anyone know how to get rid of this. Would HIJACKTHIS be of any use for this?

Guidance appreciated...

Following RootKitRevealer log posted at SYSINTERNALS:
HKU\.default\Control Panel\International 8/13/2008 7:09 PM 0 bytes Security mismatch.
HKU\.default\Control Panel\International\Geo 8/13/2008 7:09 PM 0 bytes Security mismatch.
HKU\s-1-5-18\Control Panel\International 8/13/2008 7:09 PM 0 bytes Security mismatch.
HKU\s-1-5-18\Control Panel\International\Geo 8/13/2008 7:09 PM 0 bytes Security mismatch.
HKLM\SECURITY\Policy\Secrets\SAC* 9/7/2006 5:01 PM 0 bytes Key name contains embedded nulls (*)
HKLM\SECURITY\Policy\Secrets\SAI* 9/7/2006 5:01 PM 0 bytes Key name contains embedded nulls (*)
HKLM\SOFTWARE\Microsoft\Cryptography\RNG\Seed 9/9/2008 7:15 PM 80 bytes Data mismatch between Windows API and raw hive data.
HKLM\SYSTEM\ControlSet001\Services\tcyazfq 9/5/2008 9:02 AM 0 bytes Hidden from Windows API.
HKLM\SYSTEM\ControlSet003\Services\tcyazfq 9/5/2008 9:02 AM 0 bytes Hidden from Windows API.

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#2 quietman7


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Posted 10 September 2008 - 10:21 AM

uwzfqas.sys = Backdoor.Rustock.B

IMPORTANT NOTE: Rootkits and backdoor Trojans are very dangerous because they use advanced techniques (backdoors) as a means of accessing a computer system that bypasses security mechanisms and steal sensitive information which they send back to the hacker. Many rootkits can hook into the Windows 32-bit kernel, and patch several APIs to hide new registry keys and files they install. Remote attackers use backdoor Trojans and rootkits as part of an exploit to gain unauthorized access to a computer and take control of it without your knowledge.

If your computer was used for online banking, has credit card information or other sensitive data on it, you should immediately disconnect from the Internet until your system is cleaned. All passwords should be changed immediately to include those used for banking, email, eBay, paypal and online forums. You should consider them to be compromised. They should be changed by using a different computer and not the infected one. If not, an attacker may get the new passwords and transaction information. Banking and credit card institutions should be notified of the possible security breach. Because your computer was compromised please read How Do I Handle Possible Identify Theft, Internet Fraud and CC Fraud?

Although the rootkit has been identified and may be removed, your PC has likely been compromised and there is no way to be sure the computer can ever be trusted again. It is dangerous and incorrect to assume that because this malware has been removed the computer is now secure. In some instances an infection may have caused so much damage to your system that it cannot be completely cleaned or repaired. The malware may leave so many remnants behind that security tools cannot find them. Many experts in the security community believe that once infected with this type of malware, the best course of action is to wipe the drive clean, reformat and reinstall the OS. Please read:

"When should I re-format? How should I reinstall?"
"Help: I Got Hacked. Now What Do I Do?"
"Where to draw the line? When to recommend a format and reinstall?"

Should you decide not to follow that advice, we will do our best to help clean the computer of any infections but we cannot guarantee it to be trustworthy or that the removal will be successful. Let me know how you wish to proceed.
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