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Virut, Couple Trojans on Computer


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#1 Snuupy

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Posted 08 March 2010 - 09:00 PM

Hi there.

This all first started when I magically got a virus. Somehow.

So, thinking this was a simple one that I usually get, I backed up my files on C:\ and formatted. (I have 2 partitions)

Usually, it fixes the simple viruses.

But this wasn't the case :thumbsup:


The virus would corrupt system files, put porn links on my desktop, and spread itself.

Finally, after reinstalling a couple times and formatting, I got some friends help, and they told me to use a BartPE, and to use a2 scanner there.

It seemed that if I got the Virut, it would corrupt system files.

So I ran MBAM in safe mode, and it did find quite a few.
I found out it corrupted system files b/c when I ran windows in reg. mode, it said services.exe error.


Next, I found that I had the Win32/Virut virus, and me running files from D:\, my other partition gave me the virus, since I didn't format D. It had my files there, and MAYBE the virut or other viruses installed their stuff there.

To remove SOME of the viruts, I used the AVG Virut remover, and it found 1500 files, and repaired all of them.

My friend[s] have also told me that usually, viruses/trojans will install other viruses on my system, so right now, my C:\ partition is clean. I have not yet run any files from D:\.

However, my backups are in D:\, and I need most of those files.

How would I make sure my D:\ stuff is ok, and even if there are false positives, how do I make sure I can use the stuff from D:\ again? Everything there is important...so is there a way to make sure there aren't any viruses in D:\?

Right now, I can run windows, and it's not corrupted or anything yet, it's a fresh install.

I've really tried to put as much info as I could, how do I fix this?

Is it because it's a complicated problem, that no one's replying, or am I not doing something right in my post?

Edited by Snuupy, 08 March 2010 - 10:08 PM.


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#2 Orange Blossom

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Posted 09 March 2010 - 10:55 PM

Hello,

Your backup reinfected the computer after the reformat.

2 guidelines 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 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.

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 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:
Help us help you. If HelpBot replies, you MUST follow step 1 in its reply so we know you need help.

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#3 Snuupy

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Posted 10 March 2010 - 03:33 PM

thanks for your reply.

I've backed up my files, is .doc, .docx and other MS Office stuff ok?

I've put it on a thumb drive, but do I still do a reinstall (format>reinstall) again, if I haven't run ANYTHING (from my D:\) after (Formatting) reinstalling last time?

Edited by Snuupy, 10 March 2010 - 03:37 PM.


#4 boopme

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Posted 10 March 2010 - 03:36 PM

In some instances (and Always with Virut) 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 Snuupy

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Posted 10 March 2010 - 04:49 PM

what I mean is that I've backed up my stuff, and reinstalled. Then, I came here for help.

my backuped stuff was in D:\, and since I came here, I backed up the "allowed" files.

I have NOT run anything from D:\ before formatting, so I don't have to reinstall, is that correct?

also, do you mean that the virut may have spread to my USB Drives?

also, before coming here, I've shift-plugged in USB drive, and formatted it before. Do I still need the USB Flash drive fix thing?
Edit: anyways, I did that.

Edited by Snuupy, 10 March 2010 - 05:41 PM.





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