Threat Encyclopedia

Selected viruses, spyware, and other threats: sorted alphabetically

Short description
Win32/LockScreen.AR 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%\Help\hlp.exe
In order to be executed on every system start, the trojan sets the following Registry entries:
  • [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
    CurrentVersion\Run]
    "sound" = "%windir%\Help\hlp.exe"
  • [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\
    CurrentVersion\Winlogon]
    "Userinit" = "%windir%\Help\hlp.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:
  • 5748839
The trojan disables the following key combinations: ALT + F4 .

The trojan creates the following files:
  • c:\del.bat
  • %windir%\Help\tm