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Removal instructions for Antivirus 2011 Edition limitée

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Content is republished with permission from Malwarebytes.

What is Antivirus 2011 Edition limitée?

The Malwarebytes research team has determined that Antivirus 2011 Edition limitée 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 Antivirus 2011 Edition limitée?

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

Posted Image

And you might see these warnings:

Posted Image

Posted Image

How did Antivirus 2011 Edition limitée get on my computer?

Rogue programs use different methods for spreading themselves. This particular one was installed by infected sites.

How do I remove Antivirus 2011 Edition limitée?

Using Task Manager

Since this rogue attempts to hide your taskbar and your desktop icons, you may have to use another method to run programs.

  • Open the Task Manager by pressing Ctrl+Shift+Esc on your keyboard or by right-clicking on your taskbar (assuming it's visible) and clicking on Start Task Manager
  • Click on File at the top and select New Task (Run...)
  • In the Create New Task box type mbam and press Enter or click on OK Note: If Malwarebytes' Anti-Malware is currently not installed, you can instead use the Browse... button and locate the setup file for Malwarebaytes' Anti-Malware if you've already downloaded it, if you haven't, then you can instead type or copy/paste http://malwarebytes.org/mbam-download.php into the box and press Enter or click on OK to download and run Malwarebytes' Anti-Malware's setup file

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 Antivirus 2011 Edition limitée?

  • No, Malwarebytes' Anti-Malware removes Antivirus 2011 Edition limitée 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 Antivirus 2011 Edition limitée rogue. It would have warned you before the rogue could install itself, giving you a chance to stop it before it became too late.

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Technical details for experts

Signs in a HijackThis log:
C:\Documents and Settings\{username}\Desktop\avupdt4126.exe
C:\Documents and Settings\{username}\Application Data\AVS\svchost.exe

O4 - HKLM\..\Run: [Windows upgrade] C:\Documents and Settings\{username}\Application Data\AVS\svchost.exe
O4 - HKCU\..\Run: [Windows upgrade] C:\Documents and Settings\{username}\Application Data\AVS\svchost.exe

Note: I ran the installer from the desktop, so the path to avupdt4126.exe can be different in other cases.

Alterations made by the installer:

  File System
    Adds the folder C:\Documents and Settings\{username}\Application Data\AVS
      Adds the file svchost.exe"="10:47 09/08/11 1102336 bytes

      "Windows upgrade"="'C:\Documents and Settings\{username}\Application Data\AVS\svchost.exe'"
      "Windows upgrade"="'C:\Documents and Settings\{username}\Application Data\AVS\svchost.exe'"

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

Database version: 7640

Windows 5.1.2600 Service Pack 3
Internet Explorer 8.0.6001.18702

9/3/2011 10:08:43 AM
mbam-log-2011-09-03 (10-08-43).txt

Scan type: Quick scan
Objects scanned: 143306
Time elapsed: 1 minute(s), 2 second(s)

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

Memory Processes Infected:
c:\documents and settings\{username}\Desktop\avupdt4126.exe (Rogue.Installer) -> 1008 -> Unloaded process successfully.

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows upgrade (Rogue.Installer) -> Value: Windows upgrade -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows upgrade (Rogue.Installer) -> Value: Windows upgrade -> Quarantined and deleted successfully.

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
(No malicious items detected)

Files Infected:
c:\documents and settings\{username}\Desktop\avupdt4126.exe (Rogue.Installer) -> Quarantined and deleted successfully.
c:\documents and settings\{username}\application data\AVS\svchost.exe (Rogue.Installer) -> 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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