Remove AntivirusBest (Removal Guide)

  • June 28, 2009

AntivirusBest is a rogue anti-spyware program from the same family as Anti-Virus-1 and Anti-Virus Number 1. This program uses deceptive scan results and fake security warnings in order to convince you that you are infected. When AntivirusBest is installed on your computer it will be configured to start automatically. Once running the program will scan your computer and then show numerous infections that it states will not be removed unless you purchase the program. These infections, though, are all fake and do not exist anywhere on your computer and are only being shown to scam you into purchasing the program.

  • AntivirusBest Screen shot
  • Scan summary screen
  • Installer
  • Security Alert
  • Fake Blue Screen of Death
  • Fake reboot promoting AntivirusBest
  • Fake PC Magazine Review
  • Fake Security Alert  #1
  • Fake security alert #2
  • Fake Windows Security Center
  • Internet Explorer Hijack

While AntivirusBest is running you will see numerous pop-ups and alerts stating that your computer is under attack. Some of the alerts you may see are:

AntivirusBEST protection has detected Spyware program Win32.Monster.fx that is trying to attack your computer.
Do you want to block the attack?

System files modification alert!
Some critical files of your computer were modified by malicious programs. It may cause system instability and data loss. Click here to block unauthorised
<sic> modifications by removing threats.

Spyware activity alert!
Spyware.IEMonster activity detected. It is spyware that attempts to steal passwords from Internet Explorer, Mozilla Firefox, Outlook and other programs, including logins and passwords from online banking sessions, eBay, Paypal.

If you then click on any of these alerts you will be prompted to purchase AntivirusBest in order to protect yourself.

AntivirusBest also utilizes numerous other tactics to scare you into thinking there are infections on your computer. These include:

  • At random intervals a fake screen saver will appear that pretends to be a Blue Screen of Death, or Windows crash. This screen will state that your computer crashed because an malware called Malware.Monster.DX has infected your computer. It will then pretend to reboot your computer, and while rebooting, show a fake Windows boot up screen that recommends you purchase AntivirusBest.

  • A window that impersonates the Windows Security Center. This screen will state that Security Center recommends that you register the program.

  • An Internet Explorer hijack that displays a warnings whenever you visit a web site. This warning states that Internet Explorer has detected that AntivirusBest is not registered and that you should do so.

  • Last, but not least, AntivirusBest will modify your Windows HOSTS file and then randomly open fake review pages that appear to be from legitimate sites. These fake review sites are from well-known companies such as PC Magazine, CNET, ZDNet, Reevo, and

As you can see AntivirusBest is a program to avoid as it was created for one purpose; to steal your money. If you find that you are infected with this program, please do not purchase it, and instead use the free guide below to remove AntivirusBest and any related malware.

Self Help Guide

This guide contains advanced information, but has been written in such a way so that anyone can follow it. Please ensure your data is backed up before proceeding.

If you are uncomfortable making changes to your computer or following these steps, do not worry! Instead you can get free one-on-one help by asking in the forums.

To remove AntivirusBest, follow these steps:


This removal guide may appear overwhelming due to the amount of the steps and numerous programs that will be used. It was only written this way to provide clear, detailed, and easy to understand instructions that anyone can use to remove this infection for free. Before using this guide, we suggest that you read it once and download all necessary tools to your desktop. After doing so, please print this page as you may need to close your browser window or reboot your computer.


To terminate any programs that may interfere with the removal process we must first download the Rkill program. Rkill will search your computer for active malware infections and attempt to terminate them so that they wont interfere with the removal process. To do this, please download RKill to your desktop from the following link.


When at the download page, click on the Download Now button labeled iExplore.exe. When you are prompted where to save it, please save it on your desktop.


Once it is downloaded, double-click on the iExplore.exe icon in order to automatically attempt to stop any processes associated with AntivirusBest and other malware. Please be patient while the program looks for various malware programs and ends them. When it has finished, the black window will automatically close and a log file will open. Please review the log file and then close so you can continue with the next step. If you have problems running RKill, you can download the other renamed versions of RKill from the rkill download page. All of the files are renamed copies of RKill, which you can try instead. Please note that the download page will open in a new browser window or tab.

Do not reboot your computer after running RKill as the malware programs will start again.


At this point you should download Malwarebytes Anti-Malware, or MBAM, to scan your computer for any any infections or adware that may be present. Please download Malwarebytes from the following location and save it to your desktop:

Malwarebytes Anti-Malware

Once downloaded, close all programs and Windows on your computer, including this one.


Double-click on the icon on your desktop named mb3-setup-1878.1878- This will start the installation of MBAM onto your computer.


When the installation begins, keep following the prompts in order to continue with the installation process. Do not make any changes to default settings and when the program has finished installing, make sure you leave Launch Malwarebytes Anti-Malware checked. Then click on the Finish button. If MalwareBytes prompts you to reboot, please do not do so.


MBAM will now start and you will be at the main screen as shown below.

Malwarebytes Anti-Malware

We now need to enable rootkit scanning to detect the largest amount of malware that is possible with MalwareBytes. To do this, click on the Settings button on the left side of the screen and you will be brought to the general settings section.

Now click on the Protection tab at the top of the screen. You will now be shown the settings MalwareBytes will use when scanning your computer.

Malwarebytes Anti-Malware Detection and Protection Settings Page

At this screen, please enable the Scan for rootkits setting by clicking on the toggle switch so it turns green.


Now that you have enabled rootkit scanning, click on the Scan button to go to the scan screen.

Malwarebytes Anti-Malware Scan Screen

Make sure Threat Scan is selected and then click on the Start Scan button. If there is an update available for Malwarebytes it will automatically download and install it before performing the scan.


MBAM will now start scanning your computer for malware. This process can take quite a while, so we suggest you do something else and periodically check on the status of the scan to see when it is finished.

Malwarebytes Anti-Malware Scanning


When MBAM is finished scanning it will display a screen that displays any malware that it has detected. Please note that the infections found may be different than what is shown in the image below due to the guide being updated for newer versions of MBAM.

MalwareBytes Scan Results

You should now click on the Remove Selected button to remove all the selected malware. MBAM will now delete all of the files and registry keys and add them to the programs quarantine. When removing the files, MBAM may require a reboot in order to remove some of them. If it displays a message stating that it needs to reboot, please allow it to do so. Once your computer has rebooted, and you are logged in, please continue with the rest of the steps.


You can now exit the MBAM program.


Now you should download HitmanPro from the following location and save it to your desktop:


When you visit the above page, please download the version that corresponds to the bit-type of the Windows version you are using.


Once downloaded, double-click on the file named HitmanPro.exe (for 32-bit versions of Windows) or HitmanPro_x64.exe (for 64-bit versions of Windows). When the program starts you will be presented with the start screen as shown below.

HitmanPro Start Screen

Now click on the Next button to continue with the scan process.


You will now be at the HitmanPro setup screen. If you would like to install the 30 day trial for HitmanPro, select the Yes, create a copy of HitmanPro so I can regularly scan this computer (recommended) option. Otherwise, if you just want to scan the computer this one time, please select the No, I only want to perform a one-time scan to check this computer option.

Kickstart Setup Options

Once you have selected one of the options, please click on the Next button.


HitmanPro will now begin to scan your computer for infections. When it has finished it will display a list of all the malware that the program found as shown in the image below. Please note that the infections found may be different than what is shown in the image.

MalwareBytes Scan Results

You should now click on the Next button to have HitmanPro remove the detected infections. When it is done you will be shown a Removal Results screen that shows the status of the various infections that were removed. At this screen you should click on the Next button and then if prompted you should click on the Reboot button. If HitmanPro does not prompt you to reboot, please just click on the Close button.

Once your computer has has restarted or you pressed the Close button, you should now be at your Windows desktop.


As many malware and unwanted programs are installed through vulnerabilities found in out-dated and insecure programs, it is strongly suggested that you use Secunia PSI to scan for vulnerable programs on your computer. A tutorial on how to use Secunia PSI to scan for vulnerable programs can be found here:

How to detect vulnerable and out-dated programs using Secunia Personal Software Inspector

Your computer should now be free of the AntivirusBest program. If your current security solution allowed this program on your computer, you may want to consider purchasing the full-featured version of Malwarebytes Anti-Malware to protect against these types of threats in the future.

If you are still having problems with your computer after completing these instructions, then please follow the steps outlined in the topic linked below:

Preparation Guide For Use Before Using Malware Removal Tools and Requesting Help

Are Your Protected?

While Malwarebytes Anti-Malware & HitmanPro will scan and clean a computer for free, the free versions do not offer real-time protection. If you want to be fully protected at all times then it is recommended that you purchase a premium version.


Malwarebytes Anti-Malware

Purchase the full-featured version of Malwarebytes Anti-Malware, which includes real-time protection, scheduled scanning, and website filtering, to protect yourself against these types of threats in the future!



Purchase the full-featured version of HitmanPro, which includes discover viruses, trojans, rootkits, spyware and other malware on up-to-date and fully protected computers using cloud protection and behavioral detections, to protect yourself against these types of threats in the future!

Disclaimer: While we do earn a commission from the sale of the above products, rest assured we only recommend them due to their effectiveness.

View Associated AntivirusBest Files

c:\Documents and Settings\All Users\Application Data\AB c:\Documents and Settings\All Users\Application Data\AB\ABEST.CAB c:\Documents and Settings\All Users\Application Data\AB\abest.exe c:\Documents and Settings\All Users\Application Data\AB\Installer.exe c:\Documents and Settings\All Users\Application Data\AB\QWProtect.dll c:\Documents and Settings\All Users\Application Data\AB\svchost.exe c:\Documents and Settings\All Users\Desktop\AntivirusBEST.lnk c:\Documents and Settings\All Users\Start Menu\Programs\AntivirusBEST c:\Documents and Settings\All Users\Start Menu\Programs\AntivirusBEST\AntivirusBEST.lnk c:\Documents and Settings\All Users\Start Menu\Programs\AntivirusBEST\Uninstall.lnk

View Associated AntivirusBest Registry Information

HKEY_CURRENT_USER\Software\ABEST\ABEST HKEY_CLASSES_ROOT\AppID\{296A8A7F-B5AC-4789-9B33-F32C2F9A6ABD} HKEY_CLASSES_ROOT\AppID\QWProtect.DLL HKEY_CLASSES_ROOT\CLSID\{44B2C9F5-608D-46de-82E1-26C5BCB85193} HKEY_CLASSES_ROOT\Interface\{296A8A7F-B5AC-4789-9B33-F32C2F9A6ABD} HKEY_CLASSES_ROOT\QWProtect.QWProtectBHO HKEY_CLASSES_ROOT\QWProtect.QWProtectBHO.1 HKEY_CLASSES_ROOT\TypeLib\{684A7904-2593-4BBE-A90E-CDAF2AC606AE} HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{44B2C9F5-608D-46de-82E1-26C5BCB85193} HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run "AntivirusBEST"

This is a self-help guide. Use at your own risk. can not be held responsible for problems that may occur by using this information. If you would like help with any of these fixes, you can ask for malware removal assistance in our Virus,Trojan,Spyware, and Malware Removal Logs forum.

If you have any questions about this self-help guide then please post those questions in our Am I infected? What do I do? and someone will help you.


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