Win32/Ransom [Threat Name] go to Threat

Win32/Ransom.G [Threat Variant Name]

Category trojan
Size 139264 B
Aliases Trojan-Ransom.Win32.Blocker.w (Kaspersky)
  Trojan:Win32/SMSer.B (Microsoft)
  Trojan.Winlock.55 (Dr.Web)
Short description

Win32/Ransom.G 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.


When executed the trojan displays the following dialog box:

The trojan does not create any copies of itself.

The following Registry entry is set:

  • [HKEY_LOCAL_MACHINE\­SOFTWARE\­Microsoft\­Windows NT\­CurrentVersion\­Winlogon]
    • "UserInit" = "%system%\­userinit.exe,%filepath%"

This causes the trojan to be executed on every system start, even in Safe Mode.

Other information

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

The trojan may perform operating system restart.

The trojan creates the following files:

  • a.bat
  • %filename%.bin

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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