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Removing Ramnit Virus


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#1 Fran_661

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Posted 07 March 2011 - 04:48 PM

Hi, I have been trying to remove the Ramnit Virus from my computer over the past few days, I have run Norton Power Erase, Malwarebytes and also Dr Web Cure-it and the computer has been acting normal since then. However I suspected there may still be infected files on the computer so I have run Combofix which has produced a log file, I would really appreciate it if someone could have a look at the log file and give me a second opinion on it!

I am also running a scan with SUPERantispyware which is picking up lots of traking cookies but nothing else, I have also scanned with NOD32 which is my main antivirus this afternoon and that didnt pick anything up. My main concern is that there may be a backdoor opened into my computer by a rootkit, I have heard of this happening with the Ramnit virus, not really sure of the best way of detecting this...

Any help with either of these isssues would be greatly appreciated! :)

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Edited by Fran_661, 07 March 2011 - 04:58 PM.


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#2 SweetTech

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Posted 08 March 2011 - 07:53 PM

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).


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The instructions seen in this post have been specifically tailored to this user and the issues they are experiencing with their computer. If you think you have a similar problem, please first read this topic, and then begin your own, new thread. I do not offer private support via Private Message.


#3 Fran_661

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Posted 08 March 2011 - 08:00 PM

Thanks for the reply, are you sure there is no way to tell if the system has been compromised? I really don't want to reformat the computer and reinstall Windows, I don't have a back up disk for Windows - the computer came with software to back up the system on to the computer's other hard drive, so the operating system is on C and the back up on D, chances are that the back up is also infected :(

#4 SweetTech

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Posted 08 March 2011 - 08:08 PM

You can always contact the manufacturer of your PC and see if they can send you one.

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#5 Fran_661

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Posted 08 March 2011 - 08:30 PM

I might try that but it is a Samsung and its a couple of years out of warrenty so I doubt they will be able to do anything, if I have to reinstall Windows I think I will have to buy a new copy.

Is there really no way of telling if the system has been compromised? I have got Zone Alarm monitering everything that is being sent in and out of the computer, it is yet to pick up anything odd, also I have been keeping an eye on task manager and as far as I can tell everything seems to be normal there too.

When the virus was on my computer the main thing it seemed to be trying to do was send me to phishing websites asking for Facebook login details and things like that, it also opened some fake looking pages telling me to update Windows. Since I have got rid of the virus the computer has been acting normal as far as I can tell...

#6 Fran_661

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Posted 08 March 2011 - 08:33 PM

Do you think there would be any way to trick it in to possibly revealing if the computer has been compromised? For example by setting up a fake Facebook account and seeing if it gets hacked?

#7 SweetTech

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Posted 09 March 2011 - 10:00 AM

Do the following:


Scanning with MalwareBytes' Anti-Malware
Please download Malwarebytes' Anti-Malware to your desktop.

  • Double-click mbam-setup.exe and follow the prompts to install the program.
  • At the end, be sure a checkmark is placed next to Update Malwarebytes' Anti-Malware and Launch Malwarebytes' Anti-Malware, then click Finish.
  • If an update is found, it will download and install the latest version.
  • Once the program has loaded, select Perform quick scan, then click Scan.
  • When the scan is complete, click OK, then Show Results to view the results.
  • Be sure that everything is checked, and click Remove Selected.
  • When completed, a log will open in Notepad. Please save it to a convenient location and post the results.
Extra Note: If MBAM encounters a file that is difficult to remove, you will be presented with 1 of 2 prompts, click OK to either and let MBAM proceed with the disinfection process, if asked to restart the computer, please do so immediately.



NEXT:



Kaspersky Online Scanner
Using Internet Explorer or Firefox, visit Kaspersky Online Scanner

1. Click Accept, when prompted to download and install the program files and database of malware definitions.

2. To optimize scanning time and produce a more sensible report for review:
  • Close any open programs
  • Turn off the real time scanner of any existing antivirus program while performing the online scan. Click HERE to see how to disable the most common antivirus programs.
3. Click Run at the Security prompt.

The program will then begin downloading and installing and will also update the database.
Please be patient as this can take quite a long time to download.
  • Once the update is complete, click on Settings.
  • Make sure these boxes are checked (ticked). If they are not, please tick them and click on the Save button:
    • Spyware, adware, dialers, and other riskware
    • Archives
    • E-mail databases
  • Click on My Computer under the green Scan bar to the left to start the scan.
  • Once the scan is complete, it will display if your system has been infected. It does not provide an option to clean/disinfect. We only require a report from it.
  • Do NOT be alarmed by what you see in the report. Many of the finds have likely been quarantined.
  • Click View report... at the bottom.
  • Click the Save report... button.

    Posted Image

  • Change the Files of type dropdown box to Text file (.txt) and name the file KasReport.txt to save the file to your desktop so that you may post it in your next reply

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The instructions seen in this post have been specifically tailored to this user and the issues they are experiencing with their computer. If you think you have a similar problem, please first read this topic, and then begin your own, new thread. I do not offer private support via Private Message.


#8 SweetTech

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Posted 12 March 2011 - 11:44 AM

Due to the lack of feedback, this topic is now closed.In the event you still have problems, please send me or any Moderator a Private Message and ask them to reopen this topic within the next 5 days.

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The instructions seen in this post have been specifically tailored to this user and the issues they are experiencing with their computer. If you think you have a similar problem, please first read this topic, and then begin your own, new thread. I do not offer private support via Private Message.





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