MSIL/LockScreen [Threat Name] go to Threat

MSIL/LockScreen.B [Threat Variant Name]

Category trojan
Size 28672 B
Detection created Oct 23, 2009
Detection database version 4535
Short description

MSIL/LockScreen.B 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.

Installation

The trojan is often included in the installation packages of games downloaded from untrustworthy sources.


The trojan does not create any copies of itself.


The trojan creates the following files:

  • %startup%\­system32.lnk

This causes the trojan to be executed on every system start.

Other information

The trojan displays the following dialog box:

When the correct password is entered the trojan is deactivated.


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

  • AgcI

Some examples follow.

The trojan creates the following files:

  • c:\­windows\­pocitanicko
  • c:\­windows\­res

Trojan requires the Microsoft .NET Framework to run.

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