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Virut.BG


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#1 eeghead

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Posted 17 October 2009 - 11:06 AM

AVG Resident Shield keeps popping up an identified Trojan Horse in the "ndis.sys" file. After a little research, I believe its win32.virut.bg, though I've also seen "Trojan Horse Dropper.Bravix.Q" in a temp file "Dc97.tmp." I've gone into safe mode and deleted all the temp files, then run AVG, Spybot, AdAware, Trend Micro's House Call and MS Malicious Software Removal tool to no avail. Please Help!

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#2 eeghead

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Posted 18 October 2009 - 11:57 AM

Is there anything short of reformatting that can be done? AVG Resident Shield actually shows the infected file to be: C:\Windows\System32\Drivers\ndis.sys and that the infection is a "Trojan Horse Rootkit-Agent.DI" Awaiting some helo. Research on your forum and others regarding Virut does seem very promising. Can data files be safely saved?

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Hello

While we understand your frustration at having to wait, please note that Bleeping Computer deals with several hundred requests for assistance such as yours on a daily basis. As a result, our backlog is quite large as are other comparable sites that help others with malware issues. Although our HJT Team members work on hundreds of requests each day, they are all volunteers who work logs when they can and are able to do so. No one is paid by Bleeping Computer for their assistance to our members.

Further, our malware removal staff is comprised of team members with various levels of skill and expertise to deal with thousands of malware variants, some more complex than others. Although we try to take DDS/HJT logs in order (starting with the oldest), it is often the skill level of the particular helper and sometimes the operating system that dictates which logs get selected first. Some infections are more complicated than others and require a higher skill level to remove. Without that skill level attempted removal could result in disastrous results. In other instances, the helper may not be familiar with the operating system that you are using, since they use another. In either case, neither of us want someone to assist you who is not familiar with your issue and attempt to fix it.

We ask that once you have posted your log and are waiting, please DO NOT "bump" your thread or make further replies until it has been responded to by a member of the HJT Team. The reason we ask this or do not respond to your requests is because that would remove you from the active queue that Techs and Staff have access to. The malware staff checks the forum for postings that have 0 replies as this makes it easier for them to identify those who have not been helped. If you post another response, there will be 1 reply. A team member, looking for a new log to work may assume another HJT Team member is already assisting you and not open the thread to respond.

That is why I have made an edit to your last post, instead of a reply. Please do not multiple post here, as that only pushes you further down the queue and causes confusion to the staff.

Please be patient. It may take a while to get a response but your log will be reviewed and answered as soon as possible.

Thank you for understanding.

Orange Blossom ~ forum moderator

Edited by Orange Blossom, 23 October 2009 - 07:48 PM.


#3 myrti

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Posted 29 October 2009 - 05:31 PM

Hi,

sorry for the delay. If you have contracted virut only a reformat will save you, I'm sorry to say.

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. URL=http://blog.trendmicro.com/virux-cases-escalate/]Virux[/URL] 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:regards _temp_

is that a bird?  a plane? nooo it's the flying blueberry!

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#4 eeghead

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Posted 30 October 2009 - 11:30 AM

Thanks, I guess! Is there any way to determine if the router has been compromised? I have it protected with a strong passphrase. What's the chance that other computers on my home network have also been infected? I've seen no evidence of that, but just wondering how invasive this bug is? eeg

#5 myrti

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Posted 31 October 2009 - 06:14 AM

Hi,

virut is network aware, it will try to infect other PC over the network, eg by infecting executables in shared folders. I would advise that you run a virus scan on every PC in that network, most anti virus program will pick up the infection, if they are still running.

regards _temp_

is that a bird?  a plane? nooo it's the flying blueberry!

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#6 myrti

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Posted 05 November 2009 - 05:30 PM

Due to lack of feedback, this topic is now Closed

If you need this topic reopened, please send me a PM.
Please include the address of this thread in your request.
This applies only to the original topic starter.

Everyone else please start a new topic.

With Regards,
_temp_

is that a bird?  a plane? nooo it's the flying blueberry!

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