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Win32:VITRO and possible Virut

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#1 mokpok


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Posted 27 June 2010 - 07:25 AM


Yesterday I got this problem on my machine. I realized about it when I started getting messages that a lot of my 'normal' software became a virus.
It came from a file which I downloaded, it was WatchTV software. I think person who from I was downloading either did that or purpose or also have similar problem without maybe knowing about it.

Computer after restarting was stopping completely. Sometimes was stopping very early so that even Start menu was not visible. Sometimes it went further however I never got it to start completely.
Then I started in Safe Mode which was working. Now I am also running in safe mode. I found some additional positions under msconfig startup menu, but turning them off did not do the job and now i just noticed that i have them back there. Additional positions were i.e. 717.exe and vsbntlo.exe.
I did full scan with Malwarebytes and removed all what it found, however problem is back.
I also run scaning with Avast Home, and it told me that basically every exe file is infected with Win32:Vitro. Fixing method in Avast did not work for this files.
I did try to run ComboFix but it gave me information:

!! ALERT !! It is NOT SAFE to continue!

The contents of the ComboFix package has been compromised.
Please download a fresh copy from:


Note: You may be infected with a file patching virus 'Virut'

Operating system is Windows XP Professional SP3, english version, 32bit

I just noticed that also cannot open kaspersky.com page, and google search redirects to other sites or back to google page.

Could you advice the procedure for repairing?

Best Regards

Edited by mokpok, 27 June 2010 - 09:15 AM.

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#2 mokpok

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Posted 04 July 2010 - 04:28 AM


I had to reinstall Windows.
Case closed - no other way I guess. Pretty bad thing.
This Win32:Vitro was downloading additional crap from network.
When i removed it from msconfig startup then anyway something was putting it back because it was appearing again and again under new names - so it was hopeless. I guess it was those infected .exe files which were making it. Additionally i could only start in safe mode.
However all infected exe files were not damaged, i could still without any problems run infected programs (they were not damaged but modified).

I deleted all infected exe files from my data on other drives before installing new system.
I only did not delete those which were anyway to be removed by formating (which were on C drive) some of which were actually part of Windows like explorer.exe. Also some .inf files were infected (like autorun.inf on usb drives). It infected all connected drives so even if i had copy of some files on other drives they anyway would be infected because drive was connected.

After reinstalling windows i scanned all data and still found one or two infected files (autorun.inf on USB) - deleted. Now is okej but I lost some installation programs but i am recovering :thumbsup:

Lesson to be learned - do not be too quick in marking files as: 'false positive' meaning false alarm from Antivirus !!


#3 Orange Blossom

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Posted 04 July 2010 - 12:33 PM


I missed this topic earlier, and yes, the only option for you was a reformat and clean install. Please read below for more information about VIRUT and about some additional precautions you need to take as a result of the infection.

Your system was 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 and Win32/Virut.17408 variants are an even more complex file infectors 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/VirutVirut is commonly spread via a flash drive (usb, pen, thumb, jump) infection using RUNDLL32.EXE and other malicious files. It 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:Orange Blossom :thumbsup:
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