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strange viruses


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#1 nicole85

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Posted 30 November 2010 - 04:01 PM

I apologize in advance for not attaching logs to my post. I did read the preparation guide and I tried to run the DDS Tool, but it froze my computer instead of running for me. I then tried to run the GMER program, which gave me a big blue screen with a stop error and I had to restart. So, unfortunately, I have no log files to attach, but hopefully someone could try to help me anyway, since I did try to follow the instructions.

The problems started almost immediately after reinstalling Windows XP from a new windows cd. I downloaded Microsoft Security Essentials which told me that I had viruses called Ramnit A and Ramnit B, which it could not remove. It thought it could, and told me it did, but they're always still there in the scan results screen. I googled and googled and searched and tried forever to remove these viruses, but I just can't. I downloaded Avast which seems to stop the virus from working; it keeps giving me messages saying a harmful url was blocked, which almost always starts with "z0g7yail0.com" and then a bunch of random characters. It also redirects me to other random websites when I click on google search results. Sometimes my task bar turns gray. Once when I logged out, it told me that other users were logged onto the system and that logging out may cause them to lose their saved data. I tried scanning with avg, which also didn't help fix the problem. I've used Combofix in the past successfully to remove problems, but with this problem when I try to run it, it just freezes the same way the DDS Tool froze when I tried to run that. When I try to run RKill, which I also used successfully in the past, it tells me that the process running that it kills is itself.

From this point I haven't got the slightest clue what to do. Help would be greatly appreciated.

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#2 Noviciate

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Posted 30 November 2010 - 04:08 PM

Good evening. :)

I'm afraid I have very bad news.

Win32/Ramnit.A is a file infector with IRCBot functionality which infects .exe, and .HTML/HTM files, and opens a back door that compromises your computer. Using this backdoor, a remote attacker can access and instruct the infected computer to download and execute more malicious files. The infected .HTML or .HTM files may be detected as Virus:VBS/Ramnit.A. Win32/Ramnit.A!dll is a related file infector often seen with this infection. It too has IRCBot functionality which infects .exe, .dll and .HTML/HTM files and opens a back door that compromises your computer. This component is injected into the default web browser by Worm:Win32/Ramnit.A which is dropped by a Ramnit infected executable file.

-- Note: As with most malware infections, the threat name may be different depending on the anti-virus or anti-malware program which detected it. Each security vendor uses their own naming conventions to identify various types of malware.
With this particular infection the safest solution and only sure way to remove it effectively is to reformat and reinstall the OS.

Why? The malware injects code in legitimate files similar to the Virut virus and in many cases the infected files (which could number in the thousands) cannot be disinfected properly by your anti-virus. When disinfection is attempted, the files often become corrupted and the system may become unstable or irreparable. The longer Ramnit.A remains on a computer, the more files it infects and corrupts so the degree of infection can vary.

Ramnit is commonly spread via a flash drive (usb, pen, thumb, jump) infection where it copies Worm:Win32/Ramnit.A with a random file name. The infection is often contracted 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.

In my opinion, Ramnit.A is not effectively disinfectable, so 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. Further, your machine has likely been compromised by the backdoor Trojan and there is no way to be sure the computer can ever be trusted again. It is dangerous and incorrect to assume the computer is secure even if your anti-virus reports that the malware appears to have been removed.

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. Please read:

Whenever a system has been compromised by a backdoor payload, it is impossible to know if or how much the backdoor has been used to affect your system...There are only a few ways to return a compromised system to a confident security configuration. These include:
• Reimaging the system
• Restoring the entire system using a full system backup from before the backdoor infection
• Reformatting and reinstalling the system

Backdoors and What They Mean to You

This is what Jesper M. Johansson at Microsoft TechNet has to say: Help: I Got Hacked. Now What Do I Do?.

The only way to clean a compromised system is to flatten and rebuild. That’s right. If you have a system that has been completely compromised, the only thing you can do is to flatten the system (reformat the system disk) and rebuild it from scratch (reinstall Windows and your applications).


So long, and thanks for all the fish.

 

 


#3 nicole85

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Posted 30 November 2010 - 04:18 PM

Thanks for the reply. The fact that it infects USB drives explains why I had it right after reinstalling windows from the install cd... I was really hoping that it wouldn't have to come to that (again), but I guess that's what I'll do. And so much for my USB drive, lol.. pretty hardcore virus.

I just wish I knew where I picked this thing up in the first place, so that I don't do it again.

Edited by nicole85, 30 November 2010 - 04:22 PM.





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