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SHeur3.AQRA / Win32/ZBot.B


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#1 celfxd

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Posted 23 September 2010 - 02:11 PM

hi everyone,
i recently got infected with these 2 annoying trojans. i keep getting reports from avg 9.0 resident shield of files beeing infected as soon as i try to open programs, etc..
i have installed and ran gmer, but got a bsod.
malwarbytes anti malware didnt completely removed the threat, and so it keeps infecting files when i restart my pc. (i got a VBS generic virus report for these files on avg) is it a rootkit?
i ve been trying to solve it and searching trough this and other forums, and decided to download and run combofix, but my problem persists.
Can someone here kindly help me out? Im ready to supply every necessary info. thx in advance

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#2 boopme

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Posted 23 September 2010 - 02:18 PM

Hello, you may not like my help here as I don't.

I'm afraid I have very bad news.

Your system is infected with a Win32/Ramnit.A!dll, a file infector with IRCBot functionality which infects .exe, .dll and .HTML files and opens a back door that compromises your computer.

Ramnit.A!dll is a component injected into the default web browser by Worm:Win32/Ramnit.A which is dropped by a Win32/Ramnit.A infected executable file. Ramnit.A also infects .exe, and .HTML/HTM files, downloads more malicious files to your system, and opens a back door that compromises your computer. The infected .HTML or .HTM files may be detected as Virus:VBS/Ramnit.A

In many cases the infected files cannot be disinfected properly by your anti-virus. When disinfection is attempted, the files become corrupted and the system may become irreparable. The longer Ramnit.A remains on a computer, the more files will become infected and corrupt so the degree of infection can vary.

Ramnit.A is commonly spread via a flash drive (usb, pen, thumb, jump) infection which is often contracted and spread 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. In many cases the infected files cannot be deleted and anti-malware scanners cannot disinfect them properly. 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).


Credit quietman7

Edited by boopme, 23 September 2010 - 02:32 PM.

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#3 celfxd

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Posted 23 September 2010 - 02:25 PM

thank you for your fast reply. im considering the option of formatting my pc, but would prefer not to, since i have valuable information on it for my studies. are you sure of that ramnit.A? because i havent seen that name in any of the scans i've made so far.

#4 boopme

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Posted 23 September 2010 - 02:33 PM

Run DrwWeb and see what it shoes.

Before we start fixing anything you should print out these instructions or copy them to a NotePad file so they will be accessible. Some steps will require you to disconnect from the Internet or use Safe Mode and you will not have access to this page.

Please download Dr.Web CureIt and save it to your desktop. DO NOT perform a scan yet.
alternate download link
Note: The file will be randomly named (i.e. 5mkuvc4z.exe).

Reboot your computer in "Safe Mode" using the F8 method. To do this, restart your computer and after hearing your computer beep once during startup (but before the Windows icon appears) press the F8 key repeatedly. A menu will appear with several options. Use the arrow keys to navigate and select the option to run Windows in "Safe Mode".

Scan with Dr.Web CureIt as follows:
  • Double-click on the randomly named file to open the program and click Start. (There is no need to update if you just downloaded the most current version
  • Read the anti-virus check by DrWeb scanner prompt and click Ok where asked to Start scan now? Allow the setup.exe to load if asked by any of your security programs.
  • The Express scan will automatically begin.
    (This is a short scan of files currently running in memory, boot sectors, and targeted folders).
  • If prompted to dowload the Full version Free Trial, ignore and click the X to close the window.
  • If an infected object is found, you will be prompted to move anything that cannot be cured. Click Yes to All. (This will move any detected files to the C:\Documents and Settings\userprofile\DoctorWeb\Quarantine folder if they can't be cured)
  • After the Express Scan is finished, put a check next to Complete scan to scan all local disks and removable media.
  • In the top menu, click Settings > Change settings, and uncheck "Heuristic analysis" under the "Scanning" tab, then click Apply, Ok.
  • Back at the main window, click the green arrow "Start Scanning" button on the right under the Dr.Web logo.
  • Please be patient as this scan could take a long time to complete.
  • When the scan has finished, a message will be displayed at the bottom indicating if any viruses were found.
  • Click Select All, then choose Cure > Move incurable.
  • In the top menu, click file and choose save report list.
  • Save the DrWeb.csv report to your desktop.
  • Exit Dr.Web Cureit when done.
  • Important! Reboot your computer because it could be possible that files in use will be moved/deleted during reboot.
  • After reboot, post the contents of the log from Dr.Web in your next reply. (You can use Notepad to open the DrWeb.cvs report)

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