Win32/Bifrose [Threat Name]

Detection created2004-05-06
World activity peak 2008-07-16 (0.59 %)
Short description

The trojan serves as a backdoor. It can be controlled remotely.


When executed, the trojan copies itself in some of the the following locations:

  • %windir%\­%variable1%\­%variable2%.exe
  • %system%\­%variable1%\­%variable2%.exe
  • %programfiles%\­%variable1%\­%variable2%.exe

The following Registry entry is set:

  • [HKEY_LOCAL_MACHINE\­SOFTWARE\­Microsoft\­Active Setup\­Installed Components\­{%variable3%}]
    • "stubpath" = "%copiedfilepath% s"

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

The following Registry entries are created:

    • "nck" = "%variable5%"
  • [HKEY_CURRENT_USER\­SOFTWARE\­%variable4%]
    • "klg" = 0
    • "nck" = "%variable5%"

The trojan may set the following Registry entries:

  • [HKEY_CURRENT_USER\­SOFTWARE\­%variable4%]
    • "delay" = "%variable6%"
    • "plg1" = "%variable7%"
    • "tor" = "%variable8%

A string with variable content is used instead of %variable1-8% .

The trojan may delete the following Registry entries:

  • [HKEY_CURRENT_USER\­SOFTWARE\­Microsoft\­Active Setup\­Installed Components\­{%variable3%}]

The trojan launches the following processes:

  • %windir%\­explorer.exe
  • %defaultbrowser%

The trojan creates and runs a new thread with its own code within these running processes.

Information stealing

Win32/Bifrose is a trojan that steals sensitive information.

The trojan collects the following information:

  • computer IP address
  • computer name
  • user name
  • volume serial number
  • the path to specific folders
  • information about the operating system and system settings
  • current screen resolution

The trojan attempts to send gathered information to a remote machine.

Other information

The trojan serves as a backdoor. It can be controlled remotely.

The trojan acquires data and commands from a remote computer or the Internet.

The trojan contains a URL address. The TCP protocol is used.

It can execute the following operations:

  • download files from a remote computer and/or the Internet
  • run executable files
  • send files to a remote computer
  • send the list of running processes to a remote computer
  • send the list of disk devices and their type to a remote computer
  • send the list of files on a specific drive to a remote computer
  • create folders
  • delete folders
  • move files
  • terminate running processes
  • create Registry entries
  • show/hide application windows
  • log keystrokes
  • uninstall itself
  • stop itself for a certain time period
  • capture screenshots
  • capture webcam video/voice
  • execute shell commands

The trojan hides its running process.

Threat Variants with Description

Threat Variant Name Date Added Threat Type
Win32/Bifrose.NTA 2009-09-29 trojan
Win32/Bifrose.NEL 2008-08-29 trojan
Win32/Bifrose.ACI 2007-01-25 trojan

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