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Unable to remove virut


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#1 garyt83

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Posted 07 September 2009 - 02:59 PM

Hi,

I think I am infected with the virut virus and probably other malware as well. I am somewhat of an advanced user and in so many years never had a problem finding and removing virus on my computer and on others until now. That aside, let me begin with my story.

OS: WIndows Vista Business SP1
CPU: Intel Core 2 Duo E7400
AV/malware scanner: Avast/malwarebytes/spybot/adware/windows defender
Problems: Unable to connect to certain sites (eg; microsoft.com-no updates, some antivirus websites, repeated found virus/malwares/problems after scanners fixing it)

I wasn't sure how I was infected with a virus(most likely something I downloaded) but I ran malwarebytes almost every week or so and that is how i found out that i was hit. I usually find for solutions online and most of them being on bleepingcomputer.com. So i immediately started running a full scan on my system with avast, malwarebytes, and ad-aware. All 3 scanners found the problems and successfully remove the problems found. I even did a bootscan with avast and it removes all found problem. However, everytime i rescan my system again, the same problem is found so i figured that the original problem hasn't been fixed.

I then downloaded combofix and running it and that is when it gives the error
!! ALERT !! It is NOT SAFE to continue!
The contents of the ComboFix package has been compromised.
Please download a fresh copy from:
http://www.bleepingcomputer.com/combofix/how-to-use-combofix

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

So i searched for solutions to fix virut and most of them says to reformat which i did. Now the first thing after i reinstall vista, is to install avast and malwarebytes and do a scan which is the first thin i always do after reinstalling any OS. Now, my first scan turns out good and my system was clean. However, vista stores the old windows file in windows.old. I needed a bunch of files from my old windows such as my firefox profiles, outlook .pst files, and probably some pictures/audio files that may be on my desktop. Now I think that is where to problem is because once i started copying those files into my fresh vista install, the problems occured again.

I know the best way is to do a fresh install again and not used any of the old files but the firefox profiles and outlook pst is very important to me. Please advice. THANKS and sorry for the long story.

p/s: i already have hijackthis, combofix and pretty much every tool on my system. the only thing i dont know how to use is hijackthis because i dont have experience with the systemfiles/logfiles which i dont understand how to read

Edited by garyt83, 07 September 2009 - 03:01 PM.


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#2 boopme

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Posted 07 September 2009 - 03:19 PM

I'm afraid I have very bad news.

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. Other variants of virut can even penetrate and infect .exe files within compressed files (.zip, .cab, rar). 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, .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 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: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 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:
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#3 garyt83

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Posted 07 September 2009 - 09:54 PM

Ok. I can always re-download my emails and reconfigure firefox. I always save my mp3s & picture files in a secondary HDD. I also have Win XP running on another HDD. Will all the other drives be infected as well or is it safe? Because whatever that is important is pretty much on my secondary HDD. I hope those are safe as well, otherwise i may have to cry myself to sleep :thumbsup:

As for my router, all i need to do is change the password right? or do I need to reset/flash everything?

Another question is, how do i reinstall vista without having it save the old windows files?

Thanks
Gary

Edited by garyt83, 07 September 2009 - 09:59 PM.


#4 boopme

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Posted 08 September 2009 - 10:37 AM

I would recommmend you scan the other drive first.. Then read below as to which files are safe.
Not an unwise decision to make. In some instances an infection may have caused so much damage to your system that it cannot be completely cleaned or repaired. Wiping your drive, reformatting, and performing a clean install of the OS or doing a factory restore removes everything and is the safest action but I cannot make that decision for you.

Reformatting a hard disk deletes all data. If you decide to reformat, you can back up all your important documents, data files and photos. The safest practice is not to backup any autorun.ini or .exe files because they may be infected. Some types of malware may disguise itself by adding and hiding its extension to the existing extension of files so be sure you take a close look at the full name. After reformatting, as a precaution, make sure you scan these files with your anti-virus prior to copying them back to your hard drive.

The best proceedure is a low level format. This completely wipes the drive. Then reinstall the OS.
Use the free version of Active@ KillDisk.
Or Darik's Boot And Nuke

The best sources of Information on this are
Reformatting Windows XP
Michael Stevens Tech

Of course also feel free to ask anything on this in the XP forum. They'd be glad to help.

==============================

2 guidelines/rules when backing up

1) Backup all your important data files, pictures, music, work etc... and save it onto an external hard-drive. These files usually include .doc, .txt, .mp3, .jpg etc...
2) Do not backup any executables files or any window files. These include .exe/.scr/.htm/.html/.xml/.zip/.rar files as they may contain traces of malware. Also, .html or .htm files that are webpages should also be avoided.

Download Belarc Advisor - builds a detailed profile of your installed software and hardware, including Microsoft Hotfixes, and displays the results in your Web browser.
Run it and then print out the results, they may be handy.

Since we don't know exactly which infections we're dealing with here, we should take some precautions before we attempt to move files from the infected machine. Run the following on your clean computer, and make sure you insert your flash drives at the prompt.
Download and Run FlashDisinfector

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.


Reinstall Windows Vista
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#5 garyt83

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Posted 09 September 2009 - 08:48 PM

Ok did all of the above. COMPLETELY reformatted my computer with all my data gone. Installed brand new vista, installed avast and malwarebytes. Scan computer and everything is clean. Installed basic drivers like audio/video and applications like msft office/firefox/winamp. Scan computer again and no problem whatsoever. Did a windows update and then scan computer again with no problems. Then tried to connect to microsoft.com and "server not found" error. I couldn't even ping microsoft.com. So I downloaded combofix and tried running it and it says the same thing again that I may be infected with virut.

What the hell??? :flowers: :trumpet: :thumbsup: I've got a feeling I may not be infected with virut but one of microsoft's update is causing this. Please help!!

Thanks
gary

#6 boopme

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Posted 10 September 2009 - 10:16 AM

Looks like you will need to run HJT/DDS. mention that you formatted and are still getting that notice.
Please follow this guide. go and do steps 6 thru 8 ,, Preparation Guide For Use Before Using Hijackthis. Then go here HijackThis Logs and Virus/Trojan/Spyware/Malware Removal ,click New Topic,give it a relevant Title and post that complete log.

Let me know if it went OK.
How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook




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