TechSpot

[Not curable - Ramnit) Win32 virus.....How do I remove it!

By hdrever
Mar 25, 2012
  1. An hour or so ago I received a sheild alert from avg of a threat detection....something called sooi832.bin

    I found and deleted the file but avg has continued finding more and more threats in my existing folders and it can't access them to remove them. After a quick google I've realised that this isn't a quick one-click fix job and I'm going to need some proper advice. Can anyone help me please?
  2. hdrever

    hdrever Newcomer, in training Topic Starter

    Malwarebytes

    Also, I already had Malwarebytes on my laptop but now it will not run. I've tried re-installing and re-naming it with a different title and .bat & .com extensions but still no joy.
  3. hdrever

    hdrever Newcomer, in training Topic Starter

    Also it's called win32/zbot
  4. Broni

    Broni Malware Annihilator Posts: 46,492   +252

    I'm afraid I have very bad news.

    You're infected with Ramnit file infector virus.

    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:
    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?.

    Important Note:: 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 to include those used for banking, email, eBay, paypal and any online activities which require a username and password. 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. Banking and credit card institutions should be notified of the possible security breach. Failure to notify your financial institution and local law enforcement can result in refusal to reimburse funds lost due to fraud or similar criminal activity.
  5. hdrever

    hdrever Newcomer, in training Topic Starter

    Oh dear. hank you for the prompt response. Could it have infected my external hard disk too? Or any ipods etc? In other words, can I copy data back off these after reinstalling the OS?

    Should I therefore assume that all files on my computer could be corrupted and therefore could bring the worm/trojan back if I were to save some to a usb etc and copy them back at a later date?

    Thanks
  6. Broni

    Broni Malware Annihilator Posts: 46,492   +252

    You can save anything you want for now.

    Then when you reinstall Windows....
    Install Panda USB Vaccine, or BitDefender’s USB Immunizer on GOOD computer to protect it from any infected USB device.

    Now you're safe to plug in any external device with your saved files and scan them with your AV program BEFORE putting anything back.


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