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Every time I format and reinstall Windows, I almost automatically have a virus


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#1 silmatharien

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Posted 02 April 2010 - 11:25 AM

Hi everyone,

The computer I'm working on has Windows XP Pro running. Anyway, I've reinstalled XP a couple times now, I'm able to do a few updates and suddenly Windows Update won't load anymore, antivirus related sites are blocked and if I do have an antivirus/spyware program installed, I can't update. Looking through my msconfig and running Hijack this I'm seeing weird items like

peresvc.exe and msyblkya.dll (both in \system32).

I think they're related to something called Virut which I have (unsuccessfully) tried to remove. Basically I'm at a loss for what to do at this point because I can't seem to avoid getting the viruses. I guess I am looking for a little guidance into how I can avoid running into this.

Thank you.

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#2 Blade

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Posted 02 April 2010 - 01:02 PM

Hi silmatharien and :thumbsup: to BleepingComputer.


Virut is one of the nastiest infections out there. Your probable cause of reinfection is via infected files being restored to the machine after the reformat. The virus could also be hiding on any writable external media (flash/USB drives, external hard drives, etc.) you connected to the system since the original infection.

Here's some information on Virut.

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. 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. Virux 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, and .html). When Virut creates infected files, it also creates non-functional files that are corrupted beyond repair. 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 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 contracted and spread by visiting remote, crack and keygen sites. These type of sites are infested with a smörgåsbord of malware and an increasing source of system infection. However, the CA Security Advisor Research Blog says they 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.

...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

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:There is no guarantee this infection can be completely removed. In some instances it 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. 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:***************************************************

basically. . . getting rid of Virut is requires a "sweep and clear" tactic. The most successful approach is to back up nothing. However, as this is not usually a reasonable approach, the following filetypes should not be backed up under any circumstances whatsoever.

Do NOT backup any applications/installers and Do NOT backup any files with the following extensions
  • .exe
  • .scr
  • .htm
  • .html
  • .xml
  • .zip
  • .rar
This because these files may be infected as well. If you back them up and replace them afterwards, it will infect your computer again.

***************************************************

As a further precaution, all drives which you are using to back up data prior to the reformat should be sterilized prior to connecting them to the infected machine using the following method with a clean computer.

Please download Flash_Disinfector.exe by sUBs and save it to your desktop.
  • Double-click Flash_Disinfector.exe to run it and follow any prompts that may appear.
  • The utility may ask you to insert your flash drive and/or other removable drives. Please do so and allow the utility to clean up those drives as well.
  • Hold down the Shift key when inserting the drive until Windows detects it to keep autorun.inf from executing if it is present.
  • Wait until it has finished scanning and then exit the program.
  • Reboot your computer when done.
Note: As part of its routine, Flash_Disinfector will create a hidden folder named autorun.inf in each partition and every USB drive that was plugged in when you ran it. Do not delete this folder...it will help protect your drives from future infection by keeping the autorun file from being installed on the root drive and running other malicious files.

Hopefully that helps some. . . feel free to reply back with any further questions or if something is not clear.

~Blade

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#3 silmatharien

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Posted 02 April 2010 - 06:46 PM

Thank you for your suggestions. They worked great and everything is running fine now. The problem was I had saved the driver installers from the previous installation and they had become infected.

#4 Blade

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Posted 02 April 2010 - 08:27 PM

Glad to hear it. :thumbsup:

~Blade

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