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Removal instructions for WindowsFixDisk

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#1
Metallica

Metallica

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Content is republished with permission from Malwarebytes.

What is WindowsFixDisk?

The Malwarebytes research team has determined that WindowsFixDisk 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 WindowsFixDisk?

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 these warnings:

Posted Image

Posted Image

Posted Image

Posted Image

How did WindowsFixDisk get on my computer?

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

How do I remove WindowsFixDisk?

Our program Malwarebytes' Anti-Malware can detect and remove this rogue application.

Note that this rogue hides many files on your computer, including most shortcuts on your desktop. You will have to set the folder options so that hidden files are shown.
Look here to find out how, if you don't know.

Posted Image

  • 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 WindowsFixDisk?

  • Your files and shortcuts could be hidden again. Look here to find out how to unhide them, if you don't know.
  • The shortcut called Windows Fix Disk on the desktop can be deleted if it belonged to the rogue.

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 WindowsFixDisk 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:
C:\Documents and Settings\All Users\Application Data\sAaAVcAvvOACS.exe

O4 - HKCU\..\Run: [sAaAVcAvvOACS] C:\Documents and Settings\All Users\Application Data\sAaAVcAvvOACS.exe

Alterations made by the installer:
  File System
  ===============
    In the existing folder C:\Documents and Settings\All Users\Application Data
      Adds the file ~18407220"="16:10 16/04/11 120 bytes
      Adds the file ~18407220r"="16:10 16/04/11 160 bytes
      Adds the file 18407220"="16:10 16/04/11 328 bytes
      Adds the file 18407220.exe"="16:09 16/04/11 475136 bytes
      Adds the file sAaAVcAvvOACS.exe"="09:12 15/04/11 552960 bytes
    In the existing folder C:\Documents and Settings\{username}\Desktop
      Adds the file Windows Fix Disk.lnk"="16:10 16/04/11 813 bytes
    Adds the folder C:\Documents and Settings\{username}\Start Menu\Programs\Windows Fix Disk
      Adds the file Windows Fix Disk.lnk"="16:10 16/04/11 825 bytes
      Adds the file Uninstall Windows Fix Disk.lnk"="16:10 16/04/11 897 bytes


  Registry
  ===============
    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system]
      "DisableTaskMgr"="1"
    [HKEY_CURRENT_USER\Control Panel\Desktop]
      "TileWallpaperOld"="'0'"
      "WallpaperOld"="'C:\WINDOWS\web\wallpaper\old.bmp'"
      "WallpaperStyleOld"="'2'"
      "Wallpaper"=""
    [HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Download]
      "CheckExeSignatures"="no"
    [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
      "Hidden"="0"
    [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
      "CertificateRevocation"="0"
      "WarnonBadCertRecving"="0"
    [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop]
      "NoChangingWallPaper"="1"
    [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Associations]
      "LowRiskFileTypes"="'/{hq:/s`s:/ogn:/uyu:/dyd:/c`u:/bnl:/ble:/sdf:/lrh:/iul:/iulm:/fhg:/clq:/kqf:/`wh:/lqf:/lqdf:/lnw:/lq2:/l2t:/v`w:/rbs:'"
    [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments]
      "SaveZoneInformation"="1"
    [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System]
      "DisableTaskMgr"="1"
    [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run]
      "sAaAVcAvvOACS"="'C:\Documents and Settings\All Users\Application Data\sAaAVcAvvOACS.exe'"


Malwarebytes' Anti-Malware log:
Malwarebytes' Anti-Malware 1.50.1.1100
www.malwarebytes.org

Database version: 6374

Windows 5.1.2600 Service Pack 3
Internet Explorer 8.0.6001.18702

4/16/2011 4:27:39 PM
mbam-log-2011-04-16 (16-27-39).txt

Scan type: Quick scan
Objects scanned: 131206
Time elapsed: 4 minute(s), 55 second(s)

Memory Processes Infected: 2
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 1
Registry Data Items Infected: 3
Folders Infected: 0
Files Infected: 2

Memory Processes Infected:
c:\documents and settings\all users\application data\saaavcavvoacs.exe (Trojan.FakeAlert) -> 168 -> Unloaded process successfully.
c:\documents and settings\all users\application data\18407220.exe (Trojan.FakeAlert) -> 2188 -> Unloaded process successfully.

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\sAaAVcAvvOACS (Trojan.FakeAlert) -> Value: sAaAVcAvvOACS -> Quarantined and deleted successfully.

Registry Data Items Infected:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop\NoChangingWallPaper (PUM.Hijack.DisplayProperties) -> Bad: (1) Good: (0) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableTaskMgr (PUM.Hijack.TaskManager) -> Bad: (1) Good: (0) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableTaskMgr (PUM.Hijack.TaskManager) -> Bad: (1) Good: (0) -> Quarantined and deleted successfully.

Folders Infected:
(No malicious items detected)

Files Infected:
c:\documents and settings\all users\application data\saaavcavvoacs.exe (Trojan.FakeAlert) -> Quarantined and deleted successfully.
c:\documents and settings\all users\application data\18407220.exe (Trojan.FakeAlert) -> 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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#2
damane2011

damane2011

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