Win32/LockScreen [Threat Name] go to Threat

Win32/LockScreen.AMI [Threat Variant Name]

Category trojan
Size 207782 B
Detection created Aug 17, 2012
Detection database version 7394
Aliases Trojan:Win32/Meredrop (Microsoft)
  SFX:LockScreen-A (Avast)
Short description

Win32/LockScreen.AMI is a trojan that blocks access to the Windows operating system. The file is run-time compressed using RAR SFX .

Installation

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

  • C:\­%randomnumber%.exe

The variable %randomnumber% represents a number in the range 1-99000 .


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

  • [HKEY_LOCAL_MACHINE\­SOFTWARE\­Microsoft\­Windows NT\­CurrentVersion\­Winlogon]
    • "Userinit"="userinit.exe,\­"C:\­\­\­\­%randomnumber%.exe\­" %variable%"

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

Other information

Win32/LockScreen.AMI 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 requested to comply with given conditions in exchange for a password/instructions.


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

  • 29371602741 - 7u

When the correct password is entered the trojan removes itself from the computer.


The trojan hides the windows of certain running applications.

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