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Removal instructions for WinDefrag

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Content is republished with permission from Malwarebytes.

What is WinDefrag?

The Malwarebytes research team has determined that WinDefrag is a fake anti-malware application. These so-called "rogues" use intentional false positives to convince users that their systems have been compromised. Then they try to sell you their software, claiming it will remove these threats. In extreme cases the false threats are actually the very trojans that advertise or even directly install the rogue. You are strongly advised to follow our removal instructions below.

How do I know if I am infected with WinDefrag?

This is how the main screen of the rogue application looks:

Posted Image

You will find these icons on your desktop and in your taskbar:

Posted Image

And see this type of warnings:

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How did WinDefrag get on my computer?

Rogue programs use different methods for spreading themselves. This particular one was installed by a trojan.

How do I remove WinDefrag?

Our program Malwarebytes' Anti-Malware can detect and remove this rogue application.
  • Please download Malwarebytes' Anti-Malware to your desktop.
  • Double-click mbam-setup.exe and follow the prompts to install the program.
  • At the end, be sure a check-mark is placed next to the following:

    • Update Malwarebytes' Anti-Malware
    • Launch Malwarebytes' Anti-Malware
  • Then click Finish.
  • If an update is found, it will download and install the latest version.
  • Once the program has loaded, select Perform quick scan, then click Scan.
  • When the scan is complete, click OK, then Show Results to view the results.
  • Be sure that everything is checked, and click Remove Selected. Reboot your computer if prompted.
  • When completed, a log will open in Notepad. The rogue application should now be gone.

Is there anything else I need to do to get rid of WinDefrag?

  • No, Malwarebytes' Anti-Malware removes WinDefrag completely.

How would the full version of Malwarebytes' Anti-Malware help protect me?

We hope our application has helped you eradicate this malicious software. If your current security solution let this infection through, you might please consider purchasing the FULL version of Malwarebytes' Anti-Malware for additional protection.

As you can see below the full version of Malwarebytes' Anti-Malware would have protected you against the WinDefrag rogue. It would have warned you before the rogue could install itself, giving you a chance to stop it before it became too late.

Posted Image

Technical details for experts

Signs in a HijackThis log:

O4 - HKCU\..\Run: [98f926] C:\DOCUME~1\{username}\LOCALS~1\Temp\98f926.exe

Note: the filename is random.

Alterations made by the installer:

  File System
    In the existing folder C:\Documents and Settings\{username}\Desktop
      Adds the file Win Defrag.lnk"="12:21 28/12/10 784 bytes
    In the existing folder C:\Documents and Settings\{username}\Local Settings\Temp
      Adds the file 98f926"="12:21 28/12/10 344 bytes
      Adds the file 98f926.exe"="15:27 30/11/10 358400 bytes
    Adds the folder C:\Documents and Settings\{username}\Start Menu\Programs\Win Defrag
      Adds the file Win Defrag.lnk"="12:21 28/12/10 796 bytes
      Adds the file Uninstall Win Defrag.lnk"="12:21 28/12/10 868 bytes


Malwarebytes' Anti-Malware log:
Malwarebytes' Anti-Malware

Database version: 5406

Windows 5.1.2600 Service Pack 3
Internet Explorer 6.0.2900.5512

12/28/2010 12:30:41 PM
mbam-log-2010-12-28 (12-30-41).txt

Scan type: Quick scan
Objects scanned: 119737
Time elapsed: 2 minute(s), 32 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 1
Folders Infected: 1
Files Infected: 4

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\98f926 (Rogue.WinDefrag) -> Value: 98f926 -> Quarantined and deleted successfully.

Folders Infected:
c:\documents and settings\{username}\start menu\Programs\win defrag (Rogue.WinDefrag) -> Quarantined and deleted successfully.

Files Infected:
c:\Documents and Settings\{username}\Local Settings\Temp\98f926.exe (Rogue.WinDefrag) -> Delete on reboot.
c:\documents and settings\{username}\start menu\Programs\win defrag\win defrag.lnk (Rogue.WinDefrag) -> Quarantined and deleted successfully.
c:\documents and settings\{username}\start menu\Programs\win defrag\uninstall win defrag.lnk (Rogue.WinDefrag) -> Quarantined and deleted successfully.
c:\documents and settings\{username}\Desktop\win defrag.lnk (Rogue.WinDefrag) -> Quarantined and deleted successfully.

As mentioned before the full version of Malwarebytes' Anti-Malware could have protected your computer against this threat.
We use different ways of protecting your computer(s):
  • Dynamically Blocks Malware Sites & Servers
  • Malware Execution Prevention
Save yourself the hassle and get protected.
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