Win32/LockScreen [Threat Name] go to Threat

Win32/LockScreen.AO [Threat Variant Name]

Category trojan
Size 18432 B
Aliases Trojan-Ransom.Win32.Blocker.ch (Kaspersky)
  Ransom!p (McAfee)
  Trojan:Win32/Ransom.F (Microsoft)
Short description

Win32/LockScreen.AO 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 is deactivated. The file is run-time compressed using UPX .

Installation

When executed, the trojan copies itself into the %appdata% folder using one of the following file names:

  • kurlc.exe
  • lilrn.exe
  • mobmx.exe
  • rqdjl.exe

In order to be executed on every system start, the trojan sets the following Registry entry:

  • [HKEY_CURRENT_USER\­Software\­Microsoft\­Windows\­CurrentVersion\­Run]
    • "wsc" = "%appdata%\­%filename%.exe"

A string with variable content is used instead of %filename% .

Other information

The trojan displays the following dialog box:

When the correct password is entered the trojan is deactivated.


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

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