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System 32 Ramnit-I Virus


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#1 dwneal

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Posted 16 November 2010 - 10:14 AM

I got this virus and am having great difficulty getting rid of it. Microsoft Security Essential found it but could not get rid of it. It replicates and puts over 1000 of them on my computer. I used combofix and it fixed my internet connectivity but when I reinstalled Microsoft Security Essentials it found 1600 instances of this virus again and says it cleaned it but when I run it again it finds more.

I have the log from combo fix does anyone know how to interpret or have a solution. I would appreciate any help anyone can provide. I have attached the Combo Fix Log FileAttached File  ComboFix.txt   20.88KB   8 downloadsAttached File  combo fix log.txt   20.88KB   6 downloadsAttached File  ComboFix.txt   20.88KB   8 downloadsAttached File  combo fix log.txt   20.88KB   6 downloads

Edited by hamluis, 16 November 2010 - 10:27 AM.
Moved from XP to Malware Removal Logs ~ Hamluis.


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#2 quietman7

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Posted 16 November 2010 - 11:42 AM

I'm afraid I have very bad news.

Your system is seriously infected.

While ComboFix is very good and appears to have removed some nasties already, it cannot perform miracles and cannot repair the damage caused by a file infector. As you are already finding out, this malware keeps infecting more and more files.

Win32/Ramnit.A / Win32/Ramnit.B is a dangerous 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 The infected .HTML or .HTM files may be detected as Virus:VBS/Ramnit.A or VBS/Generic. 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 damage 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 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. Security vendors that claim to be able to remove file infectors cannot guarantee that all traces of it will be removed as they may not find all the remnants. If something goes awry during the malware removal process there is always a risk the computer may become unstable or unbootable and you could loose access to all your data.

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).


In addition, there is also evidence of a TDSS rootkit infection. To learn more about that, please refer to:
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