Threat Encyclopedia

Selected viruses, spyware, and other threats: sorted alphabetically

Short description
Win32/Delf.OHJ 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.
Installation
The trojan does not create any copies of itself.

In order to be executed on every system start, the trojan sets the following Registry entry:
  • [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
    CurrentVersion\Run]
    "ekzabc" = "%filepath%"
The following Registry entries are created:
  • [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\EC]
    "dw"
  • [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\EC]
    "dh"
The following Registry entry is deleted:
  • [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\
    SafeBoot]
Other information
The trojan displays the following dialog box:

The dialog box contains the following text:
  • Операцеонной системой была обнаружена проблема, которая может повродеить вашем
  • Драйвер устройства, вызвавший повреждения был обезврежен
  • Нарушенный драйвер на стеке ядра должны быть заменены рабоч
  • Technical information:
  • ***STOP: 0x000000C4 (0x0000003C, 0x00000000, 0x00000000)

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:
  • vash

The trojan creates the following files:
  • gg.cmd