Win32/LockScreen [Threat Name] go to Threat

Win32/LockScreen.AJT [Threat Variant Name]

Category trojan
Size 58368 B
Detection created Jan 23, 2012
Detection database version 6820
Aliases Trojan-Dropper.Win32.Injector.cgqq (Kaspersky)
  VirTool:Win32/VBInject (Microsoft)
  Trojan.MulDrop3.24681 (Dr.Web)
Short description

Win32/LockScreen.AJT is a trojan that blocks access to the Windows operating system. To regain access to the operating system the user is asked to send information/certain amount of money via Ukash, Paysafecard payment service. When the correct password is entered the trojan removes itself from the computer.

Installation

When executed, the trojan copies itself into the following location:

  • %appdata%\­12345\­12345.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]
    • "12345" = %appdata%\­12345\­12345.exe

The trojan can create and run a new thread with its own program code within the following processes:

  • explorer.exe
Information stealing

The trojan collects the following information:

  • information about the operating system and system settings
  • malware version

The trojan attempts to send gathered information to a remote machine.


The trojan contains an URL address. The HTTP protocol is used.

Other information

Win32/LockScreen.AJT is a trojan that blocks access to the Windows operating system.


The trojan displays the following dialog box:

To regain access to the operating system the user is asked to send information/certain amount of money via Ukash, Paysafecard payment service.


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:

  • 1029384756

The trojan blocks keyboard and mouse input.


The trojan terminates processes with any of the following strings in the name:

  • taskmgr.exe
  • regedit.exe
  • seth.exe
  • msconfig.exe
  • utilman.exe
  • narrator.exe

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