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  3. Backdoor.Bifrose


Risk Level 1: Very Low

October 12, 2004
October 12, 2004 1:44:30 PM
Infection Length:
72,397 bytes
Systems Affected:
Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP
Backdoor.Bifrose is a Trojan horse that uses a back door server to send information to a remote server. It then uploads one or more files and runs them on the compromised computer.

Antivirus Protection Dates

  • Initial Rapid Release version October 12, 2004
  • Latest Rapid Release version May 4, 2015 revision 021
  • Initial Daily Certified version October 12, 2004
  • Latest Daily Certified version May 4, 2015 revision 037
  • Initial Weekly Certified release date October 13, 2004
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment


  • Wild Level: Low
  • Number of Infections: 0 - 49
  • Number of Sites: 0 - 2
  • Geographical Distribution: Low
  • Threat Containment: Easy
  • Removal: Moderate


  • Damage Level: Medium
  • Payload: Downloads and executes files.
  • Releases Confidential Info: Collects system information and sends it to the hacker.


  • Distribution Level: Low
  • Ports: TCP port 1971
Note: On May 14, 2015, modifications will be made to the threat write-ups to streamline the content. The Threat Assessment section will no longer be published as this section is no longer relevant to today's threat landscape. The Risk Level will continue to be the main threat risk assessment indicator.
Writeup By: Candid Wueest

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