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Win32Zbot.E


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#1 sonyu66

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Posted 02 November 2010 - 05:26 PM

Hi I just came home and AVG 2011 was finished installing an update and all of a sudden i get the AVG resident shield alert with a whole bunch of viruses found Win32/Zbot.E VBS/Generic .
I need some help getting rid of these thanks.

Edited by hamluis, 02 November 2010 - 06:39 PM.
Moved from XP forum to Am I Infected ~ Hamluis.


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#2 sonyu66

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Posted 02 November 2010 - 07:00 PM

HI my AVG resident shield is showing a lot of stuff infected , like all programs and data , need some help please.
the virus identified is " Win32/Zbot.E "

Edited by sonyu66, 02 November 2010 - 07:02 PM.


#3 quietman7

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Posted 03 November 2010 - 07:59 AM

I'm afraid I have very bad news.

Win32/Zbot, SHeur3.AQRA and VBS Generic are names used by AVG (see the link for Threat aliases below) for variants of Win32/Ramnit.A / Win32/Ramnit.B, file infectors 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.

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 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 sonyu66

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Posted 03 November 2010 - 08:05 AM

Thanks for your reply .

#5 quietman7

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Posted 03 November 2010 - 08:17 AM

You have a duplicate thread here.

Please do not start new threads or duplicate topics as this causes confusion and makes it more difficult to get the help you need to resolve your issues. Further, it necessitates staff spending time with housecleaning to remove or close those duplicate postings...time which could have been provided to others needing assistance. I have closed that thread to avoid confusion.


Hi thanks for your reply I was afraid it would come to reformatting .
If there is anything else that can be done let me know, I am at work right now so I will be tackling this when I get home.

I'm sorry but I do not know of any security vendor who will guarantee complete removal of file infectors like Virut or Ramnit. Even vendors like Kaspersky say there is no guarantee that some files will not get corrupted during the disinfection process. In my experience, users may find their system performing better for a short time after attempted disinfection only to have it become progressively worst again as the malware continues to reinfect thousands of files. Some folks will try every tool or rescue disk they can find which eventually leaves the computer in an unbootable state as a result of futile attempts to repair critical system files and drivers. In the end most folks end up reformatting out of frustration after spending hours attempting to repair and remove the infected files.

Further your machine has likely been compromised 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 the infection appears to have been removed.

Caution: If you are considering backing up data and reformatting or doing a factory restore with a vendor-specific Recovery Disk/Recovery Partition due to malware infection, keep in mind with file infectors, there is always a chance of backed up data reinfecting your system. If the data is that important to you, then you can try to salvage some of it but there is no guarantee so be forewarned that you may have to start over again afterwards if reinfected by attempting to recover your data. Only back up your important documents, personal data files, photos 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 adding to the existing 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 CD/DVD drive is unusable, another word of caution if you are considering backing up to an external usb hard drive as your only alternative. External drives are more susceptible to infection and can become compromised in the process of backing up data. I'm not saying you should not try using such devices but I want to make you aware of all your options and associated risks so you can make an informed decision if its worth that risk.Again, do not back up any files with the following file extensions: exe, .scr, .dll, .ini, .htm, .html, .php, .asp, .xml, .zip, .rar, .cab as they may be infected.
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