BleepingComputer.com: How To Remove Cydoor

How to remove the Cydoor Adware

What this program does:

Cydoor is a component that allows applications that use it deliver ads to their users. This type of adware is usually installed when a program is offered for free to allow the author to make money by delivery ads using this program.

Tools Needed for this fix:

• HijackThis
  

Related Tutorials:

• How to use HijackThis to remove Browser Hijackers & Spyware
  

Symptoms in a HijackThis Log (Maybe different entries but will contain the same domains and hostnames):

O4 - HKLM\..\Run: [Cydoor] CD_Load.exe

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Removal Instructions:

1. Download HijackThis from the above link and extract it to c:\hijackthis.
   
   
2. Print out these instructions.
   
   
3. Navigate to the c:\hijackthis directory and double-click on HijackThis
   
   
4. When the program starts, double-click on the HijackThis icon and then click on the Scan button.
   
   
5. Put a checkmark next to the following entries if they exist:
   
   O4 - HKLM\..\Run: [Cydoor] CD_Load.exe
   
   
6. Then click the Fix button
   
   
7. Exit HijackThis.
   
   
8. Reboot your computer
   
   
9. Press control-alt-delete and end the following processes if they are running:
   
   sahdownloader.exe
   cd_install.exe
   cfd.exe
   cd_install_291.exe
   sahagent.exe
   cd_install_202.exe
   cydoor_uninstall.exe
   cd_load.exe
   cydoor.exe
   
   
10. For each of the following files, click on the Start menu, then click on Run, and in the Open: field type the following and press the OK button:
    
    regsvr32 /u filename
    
    For example: regsvr32 /u cbanner2.dll
    
    cbanner2.dll
    cd_clint.dll
    cd_html.dll
    common.dll
    cd_htm.dll
    cd_swf.dll
    gdnp.dll
    gr02.dll
    netpal.dll
    im64.dll
    cd_gif.dll
    kernellos.dll
    toolbar.dll
    gdnp.dll
    
    
11. Then delete the following files if they exist:
    
    sahdownloader.exe
    cd_install.exe
    cfd.exe
    cd_install_291.exe
    sahagent.exe
    cd_install_202.exe
    cydoor_uninstall.exe
    cd_load.exe
    cydoor.exe
    cbanner2.dll
    cd_clint.dll
    cd_html.dll
    common.dll
    cd_htm.dll
    cd_swf.dll
    gdnp.dll
    gr02.dll
    netpal.dll
    im64.dll
    cd_gif.dll
    kernellos.dll
    toolbar.dll
    gdnp.dll
    
    
12. Then delete these directories:
    
    c:\windows\system\Adcache
    c:\windows\system32\Adcache
    c:\windows\system\Roodyc
    c:\windows\system32\Roodyc
    
    
13. Reboot your computer and you are now clean.

Now your computer should no longer be infected with Cydoor. It may be possible that you still have some spyware or malware installed on your computer. If you feel this is the case, follow the instructions below to post a HijackThis log and someone will help you to remove the rest.

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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 post a HijackThis log in our HijackThis Logs and Analysis forum.

If you have any questions about this self-help guide then please post those questions in our AntiVirus, Firewall and Privacy Products and Protection Methods forum and someone will help you.