Win32/Bifrose [Threat Name] go to Threat

Win32/Bifrose.NTA [Threat Variant Name]

Category trojan
Size 891970 B
Detection created Sep 29, 2009
Detection database version 7470
Aliases Trojan.Win32.Refroso.gveu (Kaspersky)
  Backdoor:Win32/Bifrose.AE (Microsoft)
Short description

Win32/Bifrose.NTA installs a backdoor that can be controlled remotely.

Installation

When executed, the trojan copies itself into the following location:

  • %programfiles%/almalki/Explorer.EXE

The following Registry entry is set:

  • [HKEY_LOCAL_MACHINE\­SOFTWARE\­Microsoft\­Active Setup\­Installed Components\­{747D9915-6324-9FC7-1320-BF71255C5EAC}]
    • "stubpath" = "%programfiles%/almalki/Explorer.EXE"

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


The following Registry entries are created:

  • [HKEY_LOCAL_MACHINE\­SOFTWARE\­Bifrost]
    • "nck" = "%variable1%"
  • [HKEY_CURRENT_USER\­SOFTWARE\­Bifrost]
    • "klg" = 0
    • "nck" = "%variable1%"

The trojan may set the following Registry entries:

  • [HKEY_CURRENT_USER\­SOFTWARE\­Bifrost]
    • "delay" = "%variable2%"
    • "plg1" = "%variable3%"
    • "tor" = "%variable4%

A string with variable content is used instead of %variable1-4% .


The trojan may delete the following Registry entries:

  • [HKEY_CURRENT_USER\­SOFTWARE\­Microsoft\­Active Setup\­Installed Components\­{747D9915-6324-9FC7-1320-BF71255C5EAC}]

The trojan launches the following processes:

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

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

Information stealing

Win32/Bifrose.NTA 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

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