Win32/LockScreen [Threat Name] go to Threat

Win32/LockScreen.JQ [Threat Variant Name]

Category trojan
Size 92040 B
Detection created Jan 26, 2010
Detection database version 4807
Aliases Trojan-Ransom.Win32.PogBlock.wm (Kaspersky)
  Trojan.Winlock.980 (Dr.Web)
  Injector.HY (AVG)
Short description

Win32/LockScreen.JQ 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. The file is run-time compressed using UPACK .

Installation

When executed, the trojan creates the following files:

  • %appdata%\­autocfgr.exe (92040 B)
  • %appdata%\­upr%variable%.dll (49152 B)
  • %appdata%\­tmp%variable%.tmx

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


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

  • [HKEY_CURRENT_USER\­Software\­Microsoft\­Windows\­CurrentVersion\­Run]
    • "Windows Update Service" = "%appdata%\­autocfgr.exe"

The following Registry entries are created:

  • [HKEY_CURRENT_USER\­Software\­Microsoft\­Windows\­CurrentVersion\­Policies\­System]
    • "DisableTaskMgr" = 1
    • "DisableLockWorkstation" = 1
    • "DisableChangePassword" = 1
  • [HKEY_CURRENT_USER\­Software\­Microsoft\­Windows\­CurrentVersion\­Policies\­Explorer]
    • "NoLogoff" = 1
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:

  • 3097

The trojan contains a list of (1) URLs. It can send various information about the infected computer. The HTTP protocol is used.

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