Fake Windows Defender Prevented Malicious Software Scam Removal Guide

  • December 2, 2016

What is Fake Windows Defender Prevented Malicious Software Scam?

Skip this and learn how to remove Fake Windows Defender Prevented Malicious Software Scam!

The Windows Defender Prevented Malicious Software Scam is a Trojan from the Trojan.Tech-Support-Scam family that displays a fake Windows login screen that pretends that the Windows defender has blocked access to the computer because malicious files were found. This is done to try and trick the user into calling the listed remote tech support number in order to sell them unnecessary software and services.

  • Fake Windows Defender Alert Screen
  • Activation Successful

The text of this alert is:

Please Enter Product Key

Windows Defender prevented an unrecognized and malicious software on your computer. Please enter your Windows Product Key. The Product Key should be on a label or the card inside the box that Windows Disk came in or in the confirmation email you recieved after buying it. if you have upgraded to Windows 10, you have a digital license instead of a key.

A product key is a 25 character code used to active Windows. It look like this:
PRODUCT KEY: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX

Customer Support : 1-877-360-0485

The good news is that this tech support scam comes with a build in passcode that you can enter to close the screen and scan your computer with a an anti-malware program. To close the screen you can enter THTY4-89LK6-RTI23-XZTOP-05ERY as the product key. Once the screen is closed you can then scan your computer to remove the infection.

How did the Windows Defender Prevented Malicious Software Scam get on my computer?

It is important to note that this Trojan is installed by other programs that did not adequately disclose that other software would be installed along with it. Therefore, it is important that you pay attention to the license agreements and installation screens when installing anything off of the Internet. If an installation screen offers you Custom or Advanced installation options, it is a good idea to select these as they will typically disclose what other 3rd party software will also be installed. Furthermore, If the license agreement or installation screens state that they are going to install a toolbar or other unwanted adware, it is advised that you cancel the install and not use the free software.

As you can see, this scam was created to trick you into calling the listed number so that the developers can try and convince you into purchasing unnecessary services or software. For no reason should you call this number, and if you have already have purchased services, I advise you to dispute the charges with your credit card company. To remove this Trojan and any related software for free, please use the removal guide below.

Fake Windows Defender Prevented Malicious Software Scam Removal Options

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 Fake Windows Defender Prevented Malicious Software Scam, follow these steps:

1

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.

2

Reboot your computer into Safe Mode with Networking using the instructions for your version of Windows found in the following tutorial:

How to start Windows in Safe Mode

When following the steps in the above tutorial, select Safe Mode with Networking rather than just Safe Mode. When the computer reboots into Safe Mode with Networking make sure you login with the username you normally use. When you are at your Windows desktop, please continue with the rest of the steps.

3

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.

img
Rkill

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.

4

Once it is downloaded, double-click on the iExplore.exe icon in order to automatically attempt to stop any processes associated with Fake Windows Defender Prevented Malicious Software Scam 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.

5

Now please download Emsisoft Anti-Malware, which will scan for and remove any other adware that may have been bundled with this adware. Please download and save the Emsisoft Anti-Malware setup program to your desktop from the link below:

img
Emsisoft Anti-Malware

The download is fairly large, so please be patient while it downloads.

6

Once the file has been downloaded, double-click on the EmsisoftAntiMalwareSetup_bc.exe icon to start the program. If Windows Smart Screen issues an alert, please allow it to run anyway.

If the setup program displays an alert about safe mode, please click on the Yes button to continue. You should now see a dialog asking you to agree to a license agreement. Please access the agreement and click on the Install button to continue with the installation.

7

You will eventually get to a screen asking what type of license you wish to use with Emsisoft Anti-Malware.

Select License Screen

If you have an existing license key or want to buy a new license key, please select the appropriate option. Otherwise, select the Freeware or Test for 30 days, free option. If you receive an alert after clicking this button that your trial has expired, just click on the Yes button to enter freeware mode, which still allows the cleaning of infections.

8

You will now be at a screen asking if you wish to join Emsisoft's Anti-Malware network. Read the descriptions and select your choice to continue.

9

Emsisoft Anti-Malware will now begin to update it's virus detections.

Downloading Updates

Please be patient as it may take a few minutes for the updates to finish downloading.

10

When the updates are completed, you will be at a screen asking if you wish to enable PUPs detection. We strongly suggest that you select Enable PUPs Detection to protect your computer from nuisance programs such as toolbars and adware.

11

You will now be at the final installation screen. Please click on the Finish Installation button end the setup and automatically launch Emsisoft Anti-Malware.

12

Emsisoft Anti-Malware will now start and display the start screen.

Emsisoft Anti-Malware Start Screen

At this screen, please left-click on the Scan section.

13

You will now be at a screen asking what type of scan you would like to perform.

Scan selection screen

Please select the Malware Scan option to begin scanning your computer for infections. The Malware Scan option will take longer than the Quick Scan, but will also be the most thorough. As you are here to clean infections, it is worth the wait to make sure your computer is properly scanned.

14

Emsisoft Anti-Malware will now start to scan your computer for rootkits and malware. Please note that the detected infections in the image below may be different than what this guide is for.

Scanning screen

Please be patient while Emsisoft Anti-Malware scans your computer.

15

When the scan has finished, the program will display the scan results that shows what infections where found. Please note, due to an updated version of Emsisoft Anti-Malware, the screenshot below may look different than the rest of the guide.

Scan Results

Now click on the Quarantine Selected button, which will remove the infections and place them in the program's quarantine. You will now be at the last screen of the Emsisoft Anti-Malware setup program, which you can close. If Emsisoft prompts you to reboot your computer to finish the clean up process, please allow it to do so. Otherwise you can close the program.

16

If your computer is still in Safe Mode with Networking, you can reboot your computer back to normal mode. Once your computer is rebooted and you are back at the desktop, you can proceed with the rest of the instructions.

17

Now please download AdwCleaner and save it to your desktop. AdwCleaner will scan your computer for adware programs that may have been installed on your computer without your knowledge. You can download AdwCleaner from the following URL:

img
AdwCleaner
18

When AdwCleaner has finished downloading, please double-click on the AdwCleaner.exe icon that now appears on your desktop. Once you double-click on the icon the AdwCleaner program will open and you will be presented with the program's license agreement. After you read it, click on the I agree button if you wish to continue. Otherwise, click on the I disagree button to close the program. If Windows prompts you as to whether or not you wish to run AdwCleaner, please allow it to run.

If you selected to continue, you will be presented with the start screen as shown below.

AdwCleaner Start Screen

19

Now click on the Scan button in AdwCleaner. The program will now start to search for known adware programs that may be installed on your computer. When it has finished it will display all of the items it has found in Results section of the screen above. Please look through the results and try to determine if the programs that are listed contain ones that you do not want installed. If you find programs that you need to keep, then uncheck the entries associated with them.

For many people, the contents of the Results section may appear confusing. Unless you see a program name that you know should not be removed,please continue with the next step.

20

To remove the adware programs that were detected in the previous step, please click on the Clean button on the AdwCleaner screen. AdwCleaner will now prompt you to save any open files or data as the program will need to close any open programs before it starts to clean.

Please save your work and then click on the OK button. AdwCleaner will now delete all detected adware from your computer. When it is done it will display an alert that explains what PUPs (Potentially Unwanted Programs) and Adware are. Please read through this information and then press the OK button. You will now be presented with an alert that states AdwCleaner needs to reboot your computer.

AdwCleaner Reboot Prompt

Please click on the OK button to let AdwCleaner reboot your computer.

21

When your computer reboots and you are logged in, AdwCleaner will automatically open a log file that contains the files, registry keys, and programs that were removed from your computer.

AdwCleaner Log

Please review this log file and then close the Notepad Window.

22

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

img
HitmanPro

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

23

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.

24

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.

25

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.

26

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 Fake Windows Defender Prevented Malicious Software Scam program. If your current security solution allowed this program on your computer, you may want to consider purchasing the full-featured version of Emsisoft 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 Emsisoft 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.

img

Emsisoft Anti-Malware

Purchase the full-featured version of Emsisoft Anti-Malware, which includes real-time protection and behavior blocker, to protect yourself against these types of threats in the future!


img

HitmanPro

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 Fake Windows Defender Prevented Malicious Software Scam Registry Information

HKCU\Software\Microsoft\Windows\CurrentVersion\Run\Adobe Flash Player [path_to]\Adobe Acrobat.exe

This is a self-help guide. Use at your own risk.

BleepingComputer.com 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.

Login

Remember Me
Sign in anonymously