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Have I gotten rid of viruses? Is it safe?


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#1 Rex Hamilton

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Posted 02 February 2013 - 01:58 AM

Windows XP, recently had problems with AVG antivirus being disabled and not scanning or updating. But it brought up a warning about an infection by itself without any scan with the option to quarantine it. It would keep bringing this up any time I restarted Windows having clicked on the quarantine option before. Also noticed that I couldn't access the Windows firewall and couldn't get online to certain sites like the AVG site or microsoft site to fix things. I was able to download Avast and Malwarebytes, both of which caught things. Avast also ran a boot scan. These were what came up:

Win32: Downloader-DXP
Win32: Agent-AKYA
Win32: Ramnit-F
HTML:Iframe-inf
JS:Prontexi-N

After the intial scans that brought these up and quarantined them, have since run multiple scans with Avast and Malwarebytes and they keep coming up clean now. I was also able to access the firewall again. I also went through a thread on here about the Agent-AKYA one and followed all the steps/downloaded all the software in that. But looking up the Ramnit-F one I gather this could still be around even if scans say things are clear? Is there a way to know/ensure that they've all really gone? I don't want to format and re-install. Also what kind of dangers do these pose?
Should I keep files in quarantine in Malwarebytes or delete them?

Also having problems at startup, instead of booting up the fan in the hard drive starts going loudly and the monitor won't come on. Can still get it to boot up by ejecting the CD/DVD tray at the right time. This was happening weeks before the virus issues started.

Edited by Rex Hamilton, 02 February 2013 - 02:14 AM.


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#2 Broni

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Posted 02 February 2013 - 12:27 PM

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:

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).



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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