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win32.koobface & win32.virut.mtt


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#1 MrBruce1959

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Posted 19 November 2009 - 01:07 PM

Hi all! I have a laptop that my son gave me to check out for him.
The only program I got to run was Spy Bot search & destroy.
It found the Win32.koobface Trojan and a Win32.virut.mtt malware was on this PC and SB&D removed it.
Now I know there is still a virus or trojan present because although the computer connects to numorous websites. It can not connect to any web sites such as Windows update or any web sites that contain virus deffinitions. this includes Mc Affe, Microsoft's Security Esentuals and Symantec web sites.
Is there a work around that I could attempt to get a virus scanner to work?
I am well aware that what ever virus this is, it is blocking access to scanners and virus related web sites.
Besides the virus I listed above, I have no clue what viruses remain as a virus scanner will not work to reveal it.
Any help would be appreciated.
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#2 boopme

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Posted 19 November 2009 - 04:24 PM

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/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:
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#3 MrBruce1959

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Posted 23 November 2009 - 04:07 PM

First I want to thank BC for being here!
Second I want to say that I have done alot of research based on the quick reply I have received here on this forum and the time it took you to supply links to various solutions.
I am happy to reply with a message of success!
I ask you keep this thread open as I want time to add what I did and what my results were, hopefully it will help others!
Before I finish, I want to say that I succcessfully was able to get Microsoft's Security Essentuals to make it to the update website and it did a scan finding a trojanDownloader, but there is more to my story than that about how many .EXE, .DLLs and and other things I found manually before actually getting the updates to load from the internet.
I was also able to successfully go to Windows Update and install 24 updates!
I will post again soon about what I found and what I did.
I just wanted to post this to say thank you!!!!!!!!!!!!!!!!!!
Altough I may re-format eventually, the PC is running 100% better because of people like those who post here and Moderate this site really care!!!!!!!!!!!!!!1 :thumbsup:
Again Thank you all!
Welcome to Bleeping Computer! :welcome:
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My Career Involves 37 Years as an Electronics Repair Technician, to Which I am Currently Retired From.

I Am Currently Using Windows 10 Home Edition.

As a Volunteer Staff Member of Bleeping Computer, the Help That I Proudly Provide Here To Our BC Forum Board Membership is Free of Charge. :wink:




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