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Help removing 67.201. 36.16 redirect


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#1 somename

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Posted 04 November 2009 - 05:14 AM

Hello. I was recently attacked by the virut virus, which loaded a large amount of malware onto my computer. I think it is now removed, but I am still getting a pop-up in Firefox, with two tabs, one to 67.201.36.16, one to a forbidden page on the mozilla website, and sometimes some tabs containing search terms recently used in Google. It pop-ups occasionally when I click a link. I have disabled access to the address through the firewall and it is rather minor but it is worrying that nothing can detect it. I assume it is a rootkit, as the rootkitrevealer tool I used from the Microsoft website found something suspicious (I had no idea what I was doing really, I can run it again if requested). Reading other posts I think I have to run this combofix program but as I need guidance for this I am posting here.

I am running Windows XP.
I have AVG running, COMODO Internet Security at high levels alerting me to everything that goes on (only since the Virut infection) and have run scans with MalwareBytes and Dr Web (which I think removed the last traces of virut). I cannot boot into Safe mode. Also, when I try to run the windows recovery console from the CD (I am missing a number of system files, such as iexplore.exe, after initially removing virut with AVG's tool) it says it cannot find any hard drives.

I may eventually do a format and reinstall on this computer but I would like to save some files onto another computer first and would really like to ensure it is clean before communicating with other computers on the network. I also am a bit concerned that after I format that I would still have the problem running the Windows Installation from the CD and be stuck not being able to install XP.

Thank you for any help.

edit: also strangely although AVG can find no actual virus apps, since a database update yesterday it finds "Trojan horse Agent_r.OT" in every process running. It claims to clean them but scanning again after a restart they are still there. I wonder if it is actually a virus or if it is clashing with COMODO.

Edited by somename, 04 November 2009 - 05:17 AM.


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#2 rigel

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Posted 04 November 2009 - 07:44 PM

I hate to tell you this, but you need to reload and reformat your computer.

Your system is infected with a nasty variant of Virut, a polymorphic file infector with IRCBot functionality which infects .exe, .scr files, downloads more malicious files to your system, and opens a back door that compromises your computer.

With this particular infection, the safest solution and only sure way to remove it effectively is to reformat and reinstall the OS.

According to this Norman White Paper Assessment of W32/Virut, some variants can infect the HOSTS file and block access to security related web sites. Other variants of virut can even penetrate and infect .exe files within compressed files (.zip, .cab, rar). The Virux variant is an even more complex file infector which can embed an iframe into the body of web-related files and infect script files (.php, .asp, .htm, .html, .xml ). When Virut creates infected files, it also creates non-functional files that are corrupted beyond repair and in some instances can disable Windows File Protection. In many cases the infected files cannot be disinfected properly by your anti-virus. When disinfection is attempted, the files become corrupted and the system may become irreparable. The longer virut remains on a computer, the more critical system files will become infected and corrupt so the degree of infection can vary.

The virus disables Windows File Protection by injecting code into the "winlogon.exe" process that patches system code in memory.

CA Virus detail of W32/Virut

The virus has a number of bugs in its code, and as a result it may misinfect a proportion of executable files....some W32/Virut.h infections are corrupted beyond repair.

McAfee Risk Assessment and Overview of W32/Virut

There are bugs in the viral code. When the virus produces infected files, it also creates non-functional files that also contain the virus...Due to the damaged caused to files by virut it's possible to find repaired but corrupted files. They became corrupted by the incorrect writing of the viral code during the process of infection. undetected, corrupted files (possibly still containing part of the viral code) can also be found. this is caused by incorrectly written and non-function viral code present in these files.

AVG Overview of W32/VirutThis kind of infection is often contracted and spread by visiting remote, crack and keygen sites. These type of sites are infested with a smörgåsbord of malware and a major source of system infection.

...warez and crack web pages are being used by cybercriminals as download sites for malware related to VIRUT and VIRUX. Searches for serial numbers, cracks, and even antivirus products like Trend Micro yield malcodes that come in the form of executables or self-extracting files...quick links in these sites also lead to malicious files. Ads and banners are also infection vectors...

Keygen and Crack Sites Distribute VIRUX and FakeAV

However, the CA Security Advisor Research Blog have found MySpace user pages carrying the malicious Virut URL. Either way you can end up with a computer system so badly damaged that recovery is not possible and it cannot be repaired. When that happens there is nothing you can do besides reformatting and reinstalling the OS.

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. You should change each password using a clean computer and 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:Since virut is not effectively disinfectable, your best option is to perform a full reformat as there is no guarantee this infection can be completely removed. In most instances it may have caused so much damage to your system files that it cannot be completely cleaned or repaired. In many cases the infected files cannot be deleted and anti-malware scanners cannot disinfect them properly. Many experts in the security community believe that once infected with this type of malware, the best course of action is to reformat and reinstall the OS. Reinstalling Windows without first wiping the entire hard drive with a repartition and/or format will not remove the infection. The reinstall will only overwrite the Windows files. Any malware on the system will still be there afterwards. Please read:

"In a world where you can be anything, be yourself." ~ unknown

"Fall in love with someone who deserves your heart. Not someone who plays with it. Will Smith


#3 somename

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Posted 05 November 2009 - 05:38 AM

Well I better just get on with it. It's the old problem of finding the Windows setup disc for this computer.

Is there anything special I need to consider when formatting a computer that may have a rootkit or is a format a format?

#4 rigel

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Posted 05 November 2009 - 01:25 PM

If you are good with Windows, I would remove and restore the partitions and reload that way. Else, if you used a restore disk, that should wipe it clean.

"In a world where you can be anything, be yourself." ~ unknown

"Fall in love with someone who deserves your heart. Not someone who plays with it. Will Smith


#5 somename

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Posted 06 November 2009 - 05:06 AM

Hmm well it seems the laptop came with no discs so that's very useful. There is no critical data on the laptop it's just a pain I don't feel safe using it now even though I can't find any evidence of trojans actually doing anything. I will sort something out eventually I suppose.

Thank you very much for your time anyway.

#6 rigel

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Posted 07 November 2009 - 06:28 PM

You are welcome

Best wishes and safe surfing... :thumbsup:

"In a world where you can be anything, be yourself." ~ unknown

"Fall in love with someone who deserves your heart. Not someone who plays with it. Will Smith





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