[Not curable - Ramnit] Zbot.g help

By pepsimax2k
Nov 13, 2011
  1. Hey all, just picked up what looks like a fun little bug. AVG reported a few threats, cleaned them, a few more, noticed microsoft.com wasn't loading, ran a full scan, then it reported loooads of Zbot.g infections. I've since disconnected from net, removed / cleaned anything that came up in AVG, uninstalled AVG and was about to run ComboFix (seems to be the suggested solution in most threads) until I realised it wasn't XP x64 compatible.

    So now I have an XP x64 machine, no AVG on it, and zbot.g probably still doing whatever it does, so if anyone's kind enough to help out I'd be very happy :)

    First up - what's best to do right away (other than ripping out the cat5, obviously). Should I get AVG back on? Should I turn off th PC or keep it turned on (I never like rebooting things unless it doesn't start up, or does something worse). I have files on a seperate drive/partition, though none looked infected - should I physically remove the second drive? Also all files / virus updates are being put on to the machine via USB stick - should I treat this as infected and run virus scans on it etc too?

    Worst comes to worst, I can re-install the OS, just trying to save time by trying the easy things first :(

    Thanks for the help.


    EDIT: Rebooted once. Haven't killed it yet. Just half the programs :p Soo what next, reinstall AVG? Run loads of random scans (seems you liek that kinda thing :eek:) ) ? Or just re-install the OS?
  2. Broni

    Broni Malware Annihilator Posts: 45,175   +242

    Welcome aboard [​IMG]

    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.


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