Win 7 Defender is one of the recent rogue security software being installed by Trojan FakeRean. This trojan chooses randomly from a list of names each time it is installed. It has the following list of names for Windows 7:

Win 7 Security, Win 7 Defender, Win 7 Defender Pro, Total Win 7 Security, Win 7 Smart Security 2010, Win 7 Internet Security, Win 7 Security Tool, Win 7 Antimalware, Antispyware Win 7.

A rogue security software such as Win 7 Defender belongs to a family of software products that call themselves as antivirus, antispyware or registry cleaners and often use deceptive or high pressure sales tactics and deliberate false positives to convince users into buying a license/subscription. They are often repackaged and renamed. They do not actually remove malware instead many of them add more malware of their own. Users should not fall for the fake alerts and must not buy the scareware. They need to be removed immediately from your system.

Win 7 Defender executable

The trojan dropper identified as SHA1:91b06687c5ef5ce690e7e0048843c4ee0d27b692 was about 204288 bytes in size. It is detected by over 75% of the antivirus engines available at VirusTotal.

This trojan drops a file named “ave.exe” with hidden and system attributes in the “local” folder in %appdata% folder. The file ave.exe in turn drops a file without extension named “y7V11” in various system folders. You may need to enable “Show hidden files, folders and drives” and disable “hide protected operating system files” in Folder Options control panel to view these files.

The trojan modifies the Windows registry so that:
  • ave.exe is executed whenever a .exe file is run, it’s a devious way to start with Windows and restart the trojan if it is killed via Task Manager.
  • Sets Internet Explorer as the default browser and sets itself to start whenever IE is started.
  • Hijacks Internet Explorer to display a fake security alert when run.
  • Creates fake Windows Action Center and suppresses genuine Windows Action Center alerts.
  • Disables Windows Firewall



http://www.malwarehelp.org/win-7-defender-removal.html