Threat description




Backdoor:W32/Bifrose.BGE may arrive on the system as a drop file of other malware packages or may be downloaded from the Internet by other malware or unknowing users. When Running, this malware will constantly connect to a remote site where it awaits commands from a remote user.


Automatic action

Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.

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You may also refer to the Knowledge Base on the F-Secure Community site for more information.

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Technical Details

Upon execution, Bifrose.BGE, drops a text file and opens it using Internet Explorer in an attempt to mask its malicious behavior.The text file is created on the user's Desktop as:

  • 36146.txt

The main malware component is then dropped and executed in the system as:

  • %My Documents%\msnmsgr_plugin.exe

Once the control has been transfered, this malware then creates a copy of itself in the following folder:

  • %Program Files%\Microsoft Live

The copy is named MsnMsgr.exe with the file and folder attributes set to hidden.A startup registry entry is then created:

  • HKLM\Software\Microsoft\Active Setup \Installed Components\{B05ADB07-A675-7D8C-6914-85FBE370B83E} stubpath=%Program Files%\Microsoft Live\MsnMsgr.exe s

An additional registry entry is also created:

  • HKLM\Software\msnmsgr

This entry holds data needed by this malware.Once loaded in memory, this malware then injects its code to Explorer's process space where when executed, it will spawn a hidden browser process that will constantly connect to:

  • Artkill.Dyndns.Org TCP PORT 81

It then receives commands from the remote attacker and downloads other components that it needs.When an Internet connection is detected, the malware will download an additional component to be saved as TORplugin.dat, which when configured, will provide basic stealth using the TOR network.

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