Backdoor:W32/Bifrose.SN

Classification

Trojan

Backdoor

W32

Bifrose.SN, Backdoor.Win32.Bifrose.sn

Summary

Bifrose.SN is a variant of the Bifrose family of backdoors.

Automatic action

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

Suspect a file is incorrectly detected (a False Positive)?

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest detection database updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    NOTE If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note You need administrative rights to change the settings.

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User Guide

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Submit a sample

Submit a file or URL for further analysis.

Technical Details

Installation to the System

When run, Bifrose.SN copies itself under %SysDir% directory using the name winampxp.exe. It installs the following registry key to make sure it will be executed next time the system is started:

  • [HKLM\Software\Microsoft\Windows\CurrentVersion\Run]"startkey" = "winampxp.exe"

Backdoor Functions

After the installation, Bifrose.SN tries to locate a web browser and inject code into it. The injected code is the actual backdoor. The backdoor starts to communicate with the following servers using a specially crafted HTTP queries:

  • bfrost.gardenparadise.co.uk:4444
  • zingg.no-ip.org:4444
  • zingg2.no-ip.org:4444

The servers can instruct the backdoor to execute the following actions:

  • Basic file operations (copy, delete, rename, find, execute)
  • Download/upload files
  • Process operations (list, kill)
  • Registry operations (create/delete keys/values)
  • Create screenshots of the desktop