Threat Encyclopedia

Selected viruses, spyware, and other threats: sorted alphabetically

Short description
Win32/LockScreen.AH is a trojan that blocks access to the Windows operating system. To regain access to the operating system the user is asked to send an SMS message to a specified telephone number in exchange for a password. When the correct password is entered the trojan removes itself from the computer.
Installation
When executed, the trojan copies itself into the following location:
  • %windir%\Media\sound.exe
In order to be executed on system start, the trojan sets the following Registry entry:
  • [HKEY_LOCAL_MACHINE\Microsoft\Windows\CurrentVersion\RunOnce]
    "sound" = "%windir%\Media\sound.exe"
Other information
The trojan displays the following dialog box:
When the correct password is entered the trojan removes itself from the computer.

The password to regain access to the operating system is one of the following:
  • 69b453


The trojan disables the following key combinations: ALT + F4 .