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Win32.zbot.a and S.Heur3AQRA detected by AVG


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#1 Hzle

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Posted 06 October 2010 - 03:23 AM

I'm getting the same infections detected by AVG as another member here. Was wondering if they were false positives (as I think AVG has updated) but some mysql .exe files do seem to have been modified on startup this morning so I'm a little concerned.

Would it be logical to assume it could be looking for mysql root paswords - or might it be looking for passwords stored by browsers I wonder? Or is AVG now seeing these where they don't exist?

tia for any help you can give.

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#2 Hzle

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Posted 06 October 2010 - 04:34 AM

Can't run kaspersky webscanner. Many html files have been snapped up by AVG I can't view them if I restore. Other members here have talked about code being injected into .html files

Looks like "Rammit"? I haven't been to any keygen or cracking sites, though

#3 quietman7

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Posted 06 October 2010 - 08:35 AM

I'm afraid I have very bad news.

Win32/Zbot.A is the name used by AVG for Win32/Ramnit.A, 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 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.

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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#4 cosmoe32

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Posted 12 October 2010 - 05:19 PM

Hi There I am having the same problem as the other user mentioned above. The virus has quickly infected my computer my girlfriend's computer- we think through a thumb drive. I have no idea how we got it. I have no problem wiping my computer and starting over, however, she has several hundred files that she has recently been working on that she wants to back up before wiping her computer. any suggestions? she is a bit desperate... Also, is there a better anti virus software out there that would have blocked this instead of just alerting me...? Thanks in advance for the help!

#5 quietman7

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Posted 12 October 2010 - 07:55 PM

Welcome to BC cosmoe32

If you have an issue or problem you would like to discuss, please start your own topic. Doing that will help to avoid the confusion that often occurs when trying to help two or more members at the same time in the same thread. Even if your problem is similar to the original poster's problem, the solution could be different based on the kind of hardware, software, system requirements, etc. you are using and the presence of other malware. Further, posting for assistance in someone else's topic is not considered proper forum etiquette.

Thanks for your cooperation.
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#6 cosmoe32

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Posted 13 October 2010 - 04:56 AM

Oh, very sorry! i posted a new topic! thanks for your help. Cosmoe32...

#7 quietman7

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Posted 13 October 2010 - 11:19 AM

I have replied to your topic.
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