What is "bifrost"

In Norse mythology, Bifröst ( or sometimes Bilröst or Bivrost) is a burning rainbow bridge that reaches between Midgard (the world) and Asgard, the realm of the gods. The bridge is attested as Bilröst in the Poetic Edda; compiled in the 13th century from earlier traditional sources, and as Bifröst in the Prose Edda; written in the 13th century by Snorri Sturluson, and in the poetry of skalds. Both the Poetic Edda and the Prose Edda alternately refer to the bridge as Ásbrú ( Old Norse " Æsir's bridge").

According to the Prose Edda, the bridge ends in heaven at Himinbjörg, the residence of the god Heimdallr, who guards it from the jötnar. The bridge's destruction during Ragnarök by the forces of Muspell is foretold. Scholars have proposed that the bridge may have originally represented the Milky Way and have noted parallels between the bridge and another bridge in Norse mythology, Gjallarbrú.

Bifrost is a backdoor trojan horse family of more than 10 variants which can infect Windows 95 through Windows 7. Bifrost uses the typical server, server builder, and client backdoor program configuration to allow a remote attacker, who uses the client, to execute arbitrary code on the compromised machine (which runs the server whose behavior can be controlled by the server editor).

The server component (29,053 bytes) is dropped to C:\Program Files\Bifrost\server.exe with default settings and, when running, connects to a predefined IP address on TCP port 81, awaiting commands from the remote user who uses the client component. It can be assumed that once all three components are operational, the remote user can execute arbitrary code at will on the compromised machine. The server components can also be dropped to C:\Windows and file attributes changed to "Read Only" and "Hidden". Casual users may not see the directories by default due to the "hidden" attributes set on the directory. Some anti-virus programs (example AVG - 17th Feb 2010) seem to miss the file entirely.

The server builder component has the following capabilities:

• Create the server component
• Change the server component's port number and/or IP address
• Change the server component's executable name
• Change the name of the Windows registry startup entry
• Include rootkit to hide server processes
• Include extensions to add features (adds 22,759 bytes to server)
• Use persistence (makes the server harder to remove from the infected system)

The client component has the following capabilities:

• Process Manager (Browse or kill running processes)
• File manager (Browse, upload, download, or delete files)
• Window Manager (Browse, close, maximize/minimize, or rename windows)
• Get system information
• Extract passwords from machine
• Keystroke logging
• Screen capture
• Webcam capture
• Desktop logoff, reboot or shutdown
• Registry editor
• Remote shell

On December 28, 2005, the Windows WMF exploit was used to drop new variants of Bifrost to machines. Some workarounds and unofficial patches were published before Microsoft announced and issued an official patch on January 5, 2006. The WMF exploit is to be considered extremely dangerous.

Older variants of Bifrost used different ports, e.g. 1971, 1999; had a different payload, e.g. C:\Winnt\system32\system.exe; and/or wrote different Windows registry keys.

Bifrost is a Danish rock band. The early band was considered one of the last of the Danish flower power revolution bands, and is best known for the songs Hej Maria (Hello, Maria) and Det er morgen (translated: "It's Morning"), both written and sung by keyboardist Tom Lundén. While leading Bifrost, Lundén also wrote the 1976 protest song I kan ikke slå os ihjel (translated: "You cannot kill us") as an anthem for the revolutionary hippie commune of Christiania. Founded in 1974. The early band consisted of Tom Lundén, Ida Klemann, Finn Jensen, Torben Andersen, Asger Skjold-Rasmussen, Mogens Ficher and dancer and singer Annapurna. In 1977 Mikael Miller replaced Finn Jensen on guitar. In 1978 an additional guitarist, John Teglgaard, joined the group. Between 1976 and 1996, Bifrost released nine albums on the CBS and Mercury Records labels.

Bifröst is a small settlement in western Iceland, in the Mýrasýsla county.

It is located in the Northwest Political constituency and is the site of Bifröst University, a small private campus university. In the town of Bifröst there is a convenience store called Samkaup strax, a coffee house, a kindergarten and a gym among other things.

Bifrost is a lightweight distribution of Linux optimized for networking. It is named after Bifröst, the bridge which connects the world and the land of Gods in Nordic mythology.

Bifrost is a French science fiction magazine that is published every three months. It was first published in April 1996.

Bifrost is a role-playing game published by Skytrex Ltd. (U.K) in 1982.

Bifrost or Bifröst is a bridge in Norse mythology.

Bifrost may also refer to:

• Rural Municipality of Bifrost, Manitoba, Canada
• Bifröst (town), a small town in Iceland
  • Bifröst University, in Bifröst, Iceland
• Bifrost Ledge, Victoria Land, Antarctica
• Bifrost (Trojan horse), Windows malware
• Bifrost (band), a Danish "flower power" rock band of the '70s and '80s
• Bifrost (operating system), a lightweight Linux distribution optimized for networking
• Bifrost (magazine), a French science fiction magazine
• Bifrost (microarchitecture), microarchitecture for GPU by ARM
• Åsatrufellesskapet Bifrost, a Norwegian association for modern Asatru
• Bifrost (role-playing game), a role-playing game