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Bleeped-up computer - several viruses


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#1 kevalmiller

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Posted 25 February 2014 - 11:12 AM

Newbie here.  First post.  Background is that I'm a moderately competent computer user, and in the past I've been pretty successful diagnosing and eradicating viruses, but I'm currently over my head with my desktop computer. 

 

A week or so ago I tried to log into a site that I THOUGHT was for viewing Sochi Olypics events live via streaming.  It had a .RU extension, but I didn't think that was odd given the location of the games.  The site looked VERY professional, on par with ESPN or CNN.com.   The US/Russia hockey game, which was currently live, was listed as an option to stream, so I clicked it.   I am typically very skeptical online, but nothing raised any red flags (<---not a communist joke). 

 

The computer immediately started acting funny.   I run AVG 2014 Free and have had good success with it on all my machines.  I also have Spybot S&D and Malwarebytes (current versions).   I ran scans with all three.   S&D kept finding  win.downloader.gen and had trouble getting rid of it.  Eventually I though it was cleared up.

 

Yesterday, however, AVG stated that win32/zperm had been found.   I started doing scans again, and don't feel like things are right yet. 

 

I downloaded ClamWin and it found a plethora of trojans.   It found sixteen infected files:

 

Win.Trojan.Ramnit-567

Win.Trojan.Ramnit-196

Win.Trojan.Delf-12000

 

Also some "false positives". 

 

 

HELP! 

 

One more tidbit....I tried Ad-aware and it didn't work properly.   It also didn't uninstall properly using Windows, so I had to force the install.  I found various comments online about people getting malware when using or downloading Ad-aware, and I think I am in that group as well.

 

Where should I start? 

 

 

 



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#2 boopme

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Posted 25 February 2014 - 11:59 AM

I'm afraid I have very bad news. Win32/Ramnit (and related variants) is a dangerous 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 or VBS/Generic. 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 damage 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. However, a variant called the Ramnit worm targets Facebook users....can bypass two-factor authentication and transaction signing systems, gain remote access to financial institutions and compromise online banking. In my opinion, Ramnit 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. Security vendors that claim to be able to remove file infectors cannot guarantee that all traces of it will be removed as they may not find all the remnants. If something goes awry during the malware removal process there is always a risk the computer may become unstable or unbootable and you could loose access to all your data. 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 security expert miekiemoes has to say: Virut and other File infectors - Throwing in the Towel?

If I guide someone with Virut (or any other File Infector) present and their Antivirus cannot properly disinfect it, then I recommend a format and reinstall...dealing with such infections is a waste of time and that's why I prefer the fastest and safest solution - which is a format and reinstall...After all, I think it would be irresponsible to let the malware "stew" (download/spread/run more malware) for another couple of days/weeks if you already know it's a lost case.

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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#3 docdavies

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Posted 25 February 2014 - 12:01 PM

In this case I would probably start off by using a 'Live CD Rescue disc' to scan the HDD for virus and malware infections. The good thing about these is that you set your PC to boot from the disc so Windows is not actually running when it's being scanned, so there should not be any virus running at the time, making them easier to detect! That's probably too simplistic an explanation, but kind of how I see it and i've definitly had great success using them!

AVG, Kaspersky and Bit Defender all do the 'Rescue Discs', you download an ISO and burn that to a CD or DVD and then set your PC to boot from it and start the scan off. All the websites have fuller instructions on how to use them, so have a look there first. Once that's done, possibly boot into Safe Mode' (F8 on boot usually), and run something like 'Rkill' to stop any rogue processes that may be running and then scan again with a good malware scanner like Malwarebytes.

That should detect most nasty stuff I hope!

 

Regards,

 

Doc



#4 docdavies

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Posted 25 February 2014 - 12:04 PM

Blimey!

I bow to Boopme's experience, that seems to be a more thourgh examination of your infection!

Remember to save / backup your data first mind you!!

Doc


Edited by docdavies, 25 February 2014 - 12:06 PM.


#5 kevalmiller

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Posted 25 February 2014 - 01:39 PM

Blimey!

I bow to Boopme's experience, that seems to be a more thourgh examination of your infection!

Remember to save / backup your data first mind you!!

Doc

I did an online backup with SOS, but I didn't have that running prior to the infection.   Would the data files that I uploaded to SOS be clean if I do a reformat, and then restore the data files? 



#6 boopme

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Posted 25 February 2014 - 02:15 PM

If the back up is after the infection then I cannot say yes that there is no infection. But you can scan all those files first,


Further info I borrowed from our quietman7

If you have made a disk image with an imaging tool (i.e. Acronis True Image, Drive Image, Ghost, Macrium Reflect, etc.) before your system was infected, then using it is another option. Disk Imaging allows you to take a complete snapshot (image) of your hard disk which can be used for system recovery in case of a hard disk disaster or malware resistent to disinfection. The image is an exact, byte-by-byte copy of an entire hard drive (partition or logical disk) which can be used to restore your system at a later time to the exact same state the system was when you imaged the disk or partition. Essentially, it will restore the computer to the state it was in when the image was made. You will then have to reinstall all programs that you added afterwards. This includes all security updates and patches from Microsoft.

Reformatting a hard disk deletes all data. You can back up all your important documents, personal data files, photos, music, videos to a CD or DVD drive, not a flash drive or external hard drive as they may become compromised in the process. The safest practice is not to backup any executable files (*.exe), screensavers (*.scr), dynamic link library (*.dll), autorun (.ini) or script files (.php, .asp, .htm, .html, .xml) files because they may be infected by malware. Avoid backing up compressed files (.zip, .cab, .rar) that have executables inside them as some types of malware can penetrate compressed files and infect the .exe files within them. Other types of malware may even disguise itself by hiding a file extension or by adding double file extensions and/or space(s) in the file's name to hide the real extension as shown here (click Figure 1 to enlarge) so be sure you look closely at the full file name. If you cannot see the file extension, you may need to reconfigure Windows to show file name extensions. Then make sure you scan the backed up data with your anti-virus prior to to copying it back to your hard drive.

If your computer will not boot properly, please refer to:

If you need additional assistance with reformatting, partitioning or reinstalling the OS, you can start a new topic in the Operating Systems Subforums.


How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook




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