Win32/Bifrose [Threat Name] go to Threat

Win32/Bifrose.ACI [Threat Variant Name]

Category trojan
Size 398848 B
Aliases Backdoor.Win32.Bifrose.drls (Kaspersky)
  Backdoor:Win32/Bifrose (Microsoft)
Short description

Win32/Bifrose.ACI installs a backdoor that can be controlled remotely. The file is run-time compressed using IExpress, UPX .


When executed, the trojan creates the following files:

  • %temp%\­IXP%random%.TMP\­server.exe (27517 B, Win32/Bifrose.ACI)
  • %system%\­晝vt\­server.exe (27517 B, Win32/Bifrose.ACI)

The following Registry entry is set:

  • [HKEY_LOCAL_MACHINE\­SOFTWARE\­Microsoft\­Active Setup\­Installed Components\­{B7ABDAA0-C932-B55E-44D5-658EC0E97E59}]
    • "stubpath" = "%system%\­晝vt\­server.exe s"

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

The following Registry entries are created:

    • "nck" = "%variable1%"
    • "klg" = 0
    • "nck" = "%variable1%"

The trojan may set the following Registry entries:

    • "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_LOCAL_MACHINE\­SOFTWARE\­Microsoft\­Active Setup\­Installed Components\­{B7ABDAA0-C932-B55E-44D5-658EC0E97E59}]

The trojan launches the following processes:

  • %windir%\­explorer.exe
  • %defaultbrowser%
  • %programfiles%\­Internet Explorer\­iexplore.exe

The trojan creates and runs a new thread with its own program code within the following processes:

  • %windir%\­explorer.exe
  • 滞砩.exe
  • %defaultbrowser%
  • %programfiles%\­Internet Explorer\­iexplore.exe
Information stealing

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 an 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 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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