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Remove Windows System Defender (Uninstall Guide)

By on October 21, 2009 @ 09:38 PM | Read 41,999 times.
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Windows System Defender is a rogue anti-spyware program that uses fake malware files and false scan detections to trick you into thinking that you are infected. When installed, Windows System Defender will be configured to start automatically when Windows boots. The installer will also create numerous files on your computer that will then be detected as malware when the program scans your computer. If you try to remove these supposed infections with Windows System Defender, though, it will state that you first need to purchase the program before it will do so. This tactic of creating fake malware files that will then be detected by the rogue program is a common one used by rogues to trick you into thinking you are infected.

 

Windows System Defender screen shot
Windows System Defender screen shot
For more screen shots of this infection click on the image above.
There are a total of 3 images you can view.

 

While Windows System Defender is running you will be constantly shown fake security alerts and nag screens that are used to further scare you into thinking that you are infected. These alerts will state that infections have been found, your computer is sending private information, or something is attacking your computer. All of these alerts are fake and the same ones are shown on everyone's computer that has the Windows System Defender infection. Therefore, please do not purchase this software based on anything these alerts tell you.

As you can see, this program is a scam and should not be purchased. If you have already purchased it, then please contact your credit card company and dispute the charges. Finally, to remove this infection, please use the removal guide below.

 

Threat Classification:

 

Advanced information:

View Windows System Defender files.
View Windows System Defender Registry Information.

 

Tools Needed for this fix:

 

Symptoms that may be in a HijackThis Log:

O4 - HKLM\..\Run: [Windows System Defender] "C:\Documents and Settings\All Users\Application Data\61a60\WS83b.exe" /s /d

 

Guide Updates:

10/21/09 - Initial guide creation.

 


Automated Removal Instructions for Windows System Defender using Malwarebytes Anti-Malware:

 

  1. Print out these instructions as we will need to close every window that is open later in the fix.

  2. Download Malwarebytes Anti-Malware, or MBAM, from the following location and save it to your desktop:

    Malwarebytes Anti-Malware Download Link (Download page will open in a new window)


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

  4. Double-click on the icon on your desktop named mbam-setup.exe. This will start the installation of MBAM onto your computer.

  5. 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 both the Update Malwarebytes Anti-Malware and Launch Malwarebytes Anti-Malware checked. Then click on the Finish button.

  6. MBAM will now automatically start and you will see a message stating that you should update the program before performing a scan. As MBAM will automatically update itself after the install, you can press the OK button to close that box and you will now be at the main program as shown below.


    MalwareBytes Anti-Malware Screen

  7. On the Scanner tab, make sure the the Perform full scan option is selected and then click on the Scan button to start scanning your computer for Windows System Defender related files.

  8. MBAM will now start scanning your computer for malware. This process can take quite a while, so we suggest you go and do something else and periodically check on the status of the scan. When MBAM is scanning it will look like the image below.


    MalwareBytes Anti-Malware Scanning Screen

  9. When the scan is finished a message box will appear as shown in the image below.


    MalwareBytes Anti-Malware Scan Finished Screen

    You should click on the OK button to close the message box and continue with the Windows System Defender removal process.

  10. You will now be back at the main Scanner screen. At this point you should click on the Show Results button.

  11. A screen displaying all the malware that the program found will be shown as seen 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 Remove Selected button to remove all the listed 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.

  12. When MBAM has finished removing the malware, it will open the scan log and display it in Notepad. Review the log as desired, and then close the Notepad window.

  13. You can now exit the MBAM program.

Your computer should now be free of the Windows System Defender program. If your current anti-virus solution let this infection through, you may want to consider purchasing the PRO 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

 


 

Associated Windows System Defender Files:

%UserProfile%\Application Data\Windows System Defender
c:\Documents and Settings\All Users\Application Data\61a60\WSDDSys
c:\Documents and Settings\All Users\Application Data\61a60
c:\Documents and Settings\All Users\Application Data\61a60\WS83b.exe
c:\Documents and Settings\All Users\Application Data\61a60\8727.mof
c:\Documents and Settings\All Users\Application Data\61a60\mozcrt19.dll
c:\Documents and Settings\All Users\Application Data\61a60\sqlite3.dll
c:\Documents and Settings\All Users\Application Data\61a60\WSD.ico
c:\Documents and Settings\All Users\Application Data\61a60\WSDDSys\vd952342.bd
c:\Documents and Settings\All Users\Application Data\WSDDSys
c:\Documents and Settings\All Users\Application Data\WSDDSys\wsd.cfg
%UserProfile%\Application Data\Microsoft\Internet Explorer\Quick Launch\Windows System Defender.lnk
%UserProfile%\Application Data\Windows System Defender\cookies.sqlite
%UserProfile%\Desktop\Windows System Defender.lnk
%UserProfile%\Recent\ANTIGEN.dll
%UserProfile%\Recent\cid.dll
%UserProfile%\Recent\ddv.dll
%UserProfile%\Recent\eb.sys
%UserProfile%\Recent\eb.tmp
%UserProfile%\Recent\energy.sys
%UserProfile%\Recent\exec.dll
%UserProfile%\Recent\exec.tmp
%UserProfile%\Recent\FS.exe
%UserProfile%\Recent\kernel32.drv
%UserProfile%\Recent\PE.drv
%UserProfile%\Recent\PE.sys
%UserProfile%\Recent\PE.tmp
%UserProfile%\Recent\ppal.dll
%UserProfile%\Recent\SICKBOY.exe
%UserProfile%\Start Menu\Windows System Defender.lnk
%UserProfile%\Start Menu\Programs\Windows System Defender.lnk
c:\Program Files\Mozilla Firefox\searchplugins\search.xml

File Location Notes:

%UserProfile% refers to the current user's profile folder. By default, this is C:\Documents and Settings\<Current User> for Windows 2000/XP, C:\Users\<Current User> for Windows Vista/7/8, and c:\winnt\profiles\<Current User> for Windows NT.

 

Associated Windows System Defender Windows Registry Information:

HKEY_USERS\.DEFAULT\Software\Microsoft\Internet Explorer\SearchScopes "URL" => "http://search-gala.com/?&uid=222&q={searchTerms}"
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Download "RunInvalidSignatures" => "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run "Windows System Defender"

 


 

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.


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