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unusually ferocious trojan and/or combo of trojan and win32 variants...Delf?


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#1 megafari

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Posted 31 March 2010 - 07:42 PM

2 days ago I got into a nasty virus from a celebrity website that I grabbed a random image of 'Nicole Sherzinger' off of.

48+ hrs later and not even our battle scarred IT guy can get rid of it.

We have narrowed it down to a 'Delf.'

It will not let me go to mcafee, norton, ewido, or even to hijackthis.com (i got the hjt log from runalyzer).
Everytime we think we have it isolated it comes back.

Spybot always finds these and says it fixes them but does not:

Win32.delf.uc
Refpron
Win32.virut.bg
Win32.agent.icb
Win32.seneka.rtk
Win32.virut.ag

(sorry I posted the HJT log!!)

Edited by megafari, 31 March 2010 - 08:47 PM.


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#2 boopme

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Posted 31 March 2010 - 08:50 PM

Hello ,I have some good and bad news .The good is the IT guy is not crazy.. He'll never clean these..
The bad news is.............
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:
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

#3 megafari

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Posted 31 March 2010 - 09:14 PM

good god man

thanks for the really good info all the same.

#4 boopme

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Posted 31 March 2010 - 09:38 PM

You're welcome. Sorry ,I don't enjoy that post either. Many views of it and seen too many failed attempts to remove it.
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

#5 Gaijin

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Posted 01 April 2010 - 12:28 AM

I have had some sucess removing virut, Dr. Web will detect it, but the real problem is it infects nearly every file on the HD, even with a removal tool it will reinfect files that have just been cleaned on access as they are being cleaned. The way to beat it is boot from a PE, like bart PE or Microsoft DART, or ERD Commander. Then run the Dr. Web Cureit launch.exe and do a complete scan on the entire HD (Not a quick scan). After that do it one more time for good measure (hope you have a few hours to spare, if you miss even one file and it will come back with a vengence. Its the fastest spreading virus ever) You cant even keep backups normally.

I would post the download link but I don't know if thats Kosher, just thought I would give my 2 cents.

Hopefully that helps
Tom Mills

Edited by Gaijin, 01 April 2010 - 12:30 AM.


#6 boopme

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Posted 01 April 2010 - 10:21 AM

If you insist on trying to fix this infection instead of following our advice to reformat and reinstall your operating system, there are some tools and various rescue disks available from major anti-virus vendors. You can try them or booting from every rescue disk you can find but they will likely leave you computer in an unbootable state as a result of futile attempts to repair critical system files and drivers. Even the vendors like Kaspersky say there is no quarantee that some files will not get corrupted during the disinfection process. In the end most folks end up reformatting out of frustration after spending hours attempting to repair and remove infected files. IMO the safest and easiest thing to do is just reformat and reinstall Windows.

Bleeping Computer DOES NOT assume any responsibility for your attempt to repair this infection using any of the following tools. You do this at your own risk and against our advice.

These are links to Anti-virus vendors that offer free LiveCD or Rescue CD utilities that are used to boot from for repair of unbootable and damaged systems, rescue data, scan the system for virus infections. Burn it as an image to a disk to get a bootable CD. All (except Avira) are in the ISO Image file format. Avira uses an EXE that has built-in CD burning capability.If you are not sure how to burn an image, please read How to write a CD/DVD image or ISO. If you need a FREE utility to burn the ISO image, download and use ImgBurn.
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

#7 megafari

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Posted 02 April 2010 - 02:20 PM

thanks all...

I booted from disk...from erd commander actually. still came back...it even tried to attack the disc, which of course it couldnt..but still..erd boot didnt work. but i didnt have those newer links from tom mills and from you boopme.

get this.....I went and reinstalled windows....it wouldnt let me delete my partition! so long story short....it came back!!!

this thing is like the bacteria that live at the 2800 degree thermal vents in the deep ocean...impossible life form.

#8 Gaijin

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Posted 03 April 2010 - 10:01 PM

This is the tool I use to remove Virut from ERD...

http://ftp.drweb.com/pub/drweb/cureit/launch.exe

Good luck, Like I said, full scan, run it twice. Do not run any item on the hard drive. When ERD wants to mount to a windows installation choose "None - do not mount to a windows installation". If you mount your registry it will load more junk from Virut.

The fact that you could not delete your partition has nothing to do with the virus. If you were doing this in ERD and mounted your windows directory, that is why. Its best to delete your partition with your windows install disc. If you are ok with deletign your partition it is probabaly best to do that. CLeaning is only an option if you don't really want to do that. One thing to note, if you back up things to take to your new installation scan them through ERD before you copy them back to your drive.

Good luck.

Tom Mills

Edited by Gaijin, 03 April 2010 - 10:05 PM.


#9 Gaijin

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Posted 08 April 2010 - 09:06 PM

I had a virut infection just today, and have not previously seen it in years, it must be back in style. I thought I would note that you can no longer run Dr Web in ERD or Dart. There is not a big enough RAMdisk to decompress it. You have to mount the drive to another computer. Just be careful not to run anything off the drive.

#10 boopme

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Posted 08 April 2010 - 09:16 PM

As mentioned,you can try all you like and make your self happy that you removed it . That may al be fine depending on what you do with the machine.

But if you do any financials on a machine infected with Virut you do so at your own risk of Identity theft and loss.
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

#11 Computer Repair

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Posted 09 April 2010 - 12:10 AM

I got three desktop computers and one laptop 2 days ago. All of them are infected with W32.Virut.CF and W32.Virut.CE. Very nasty Viruses. Most of the system files were infected with Virut.CF and Virut.CE. More than 12 hours trying to remove them with different utilities; scripts, Symantic removal, Kaspersky removal, ZAV...etc. None of them could remove them. This Virut uses XOR algorithm, which I think it's impossible to remove it.
A2Z PC

#12 Gaijin

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Posted 12 April 2010 - 08:30 PM

I managed to finally get it clean. Its definatly a new variant, nothings out there. I just used dr web but it does not detect all of the files, only some, I noticed that avg of all things detects all the infected files but will not remove system files. I wnsws up mounting the drive and setting avg to delete all infected files, then did a repair install of windows to get it back up, after monitoring for 2 days it appears clean. The customer noted they cliocked on a youtube link which redirected somewhere else to get it, for what its worth.




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