I'm afraid I have very bad news.With this particular infection the safest solution and only sure way to remove it effectively is to reformat and reinstall the OS
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.
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
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:Backdoors and What They Mean to You
• Reimaging the system
• Restoring the entire system using a full system backup from before the backdoor infection
• Reformatting and reinstalling the system
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).