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tyozshrv.sys a virus?


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#1 stuyworld

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Posted 28 August 2010 - 03:09 PM

So I am pretty stumped right now. I work for the ITS department at a college and have dealt with computers pretty much my whole life. I know my way around and have gotten rid of tons of virus's before (luckily not many that I caused =P).

Anyway, starting around Wednesday of this week I noticed my internet going to a crawl. I have a cable connection and have never had a problem before. This wasn't constant and fluctuated a lot over the week. I called my provider and received a new modem, tried two different routers and even no router, but the problem continued. Finally over the phone, the person commented that he was seeing tons of data being set out. I closed all the active internet using problems, pidgin and dropbox being the only two at the time, but it didn't do a thing. Him saying that made me thing maybe this was a virus.

I ran malewarebytes and it picked up one one thing, a rootkit.agent at "C:\Windows\System32\drivers\tyozshrv.sys". I am running Windows 7 32 bit professional. Doing a google search, nothing came up at all for the tyozshrv.sys. As malewarebytes asked to restart my computer, I noticed the other computer on my LAN running fine, at regular internet speeds, so I'm pretty much certain that it is something to do with my main computer.

Following this reboot I ran combofix, as these are my two programs I usually turn to when I encounter a virus. It did it's thing and I decided to do malewarebytes again just to check. Sure enough, the tyozshrv.sys is still there being detected. I really just don't have anymore ideas. Having never heard of this file, and no idea what's constantly sending out data, I just don't know what to do. Anyone have some advice?

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#2 boopme

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Posted 28 August 2010 - 08:09 PM

Hello, Here's my suggestiions. That is the random name of the Rootkit. This Rootkit may have compromised the=is PC's Security.
Rootkits, backdoor Trojans, Botnets, and IRC Bots are very dangerous because they compromise system integrity by making changes that allow it to by used by the attacker for malicious purposes. Rootkits are used by Trojans to conceal its presence (hide from view) in order to prevent detection of an attacker's software and make removal more difficult. Many rootkits can hook into the Windows 32-bit kernel, and patch several APIs to hide new registry keys and files they install. They can disable your anti-virus and security tools to prevent detection and removal. Remote attackers use backdoors as a means of accessing and taking control of a computer that bypasses security mechanisms. This type of exploit allows them to steal sensitive information like passwords, personal and financial data which is send back to the hacker. To learn more about these types of infections, you can refer to:

What danger is presented by rootkits?
Rootkits and how to combat them
r00tkit Analysis: What Is A Rootkit

If your computer was used for online banking, has credit card information or other sensitive data on it, you should 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 and change each password using a clean computer, not the infected one. If not, an attacker may get the new passwords and transaction information. If using a router, you need to reset it with a strong logon/password so the malware cannot gain control before connect again. 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?
What Should I Do If I've Become A Victim Of Identity Theft?
Identity Theft Victims Guide - What to do


Although the infection 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 the computer is secure even if the malware appears to have been removed. In some instances an infection may have caused so much damage to your system that it cannot be completely cleaned or repaired so you can never be sure that you have completely removed a rootkit. The malware may leave so many remnants behind that security tools cannot find them. Tools that claim to be able to remove rootkits cannot guarantee that all traces of it will be removed. 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. Some infections are difficult to remove completely because of their morphing characteristics which allows the malware to regenerate itself. Sometimes there is another hidden piece of malware which has not been detected by your security tools that protects malicious files and registry keys (which have been detected) so they cannot be permanently deleted. Disinfection will probably require the use of more powerful tools than we recommend in this forum. Before that can be done you will need you to create and post a DDS/HijackThis log for further investigation. Let me know how you wish to proceed.


To clean,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.
Let me know if that went well.
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