Back Orifice 2000

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
Back Orifice 2000
Developer(s)Dildog (cDc) (original code)
BO2k Development Team (current maintenance)
Stable release
1.1.6 (Windows), 0.1.5 pre1 (Linux) / March 21, 2007
Operating systemMicrosoft Windows,
Linux (client only)
TypeRemote administration
Back Orifice 2000 advertisement (featuring the original logo)

Back Orifice 2000 (often shortened to BO2k) is a computer program designed for remote system administration. It enables a user to control a computer running the Microsoft Windows operating system from a remote location. The name is a pun on Microsoft BackOffice Server software.

BO2k debuted on July 10, 1999, at DEF CON 7, a computer security convention in Las Vegas, Nevada. It was originally written by Dildog, a member of US hacker group Cult of the Dead Cow. It was a successor to the cDc's Back Orifice remote administration tool, released the previous year. As of 2007, BO2k was being actively developed.

Whereas the original Back Orifice was limited to the Windows 95 and Windows 98 operating systems, BO2k also supports Windows NT, Windows 2000 and Windows XP. Some BO2k client functionality has also been implemented for Linux systems. In addition, BO2k was released as free software, which allows one to port it to other operating systems.


BO2k has a plugin architecture. The optional plugins include:

  • communication encryption with AES, Serpent, CAST-256, IDEA or Blowfish encryption algorithms
  • network address altering notification by email and CGI
  • total remote file control
  • remote Windows registry editing
  • watching at the desktop remotely by streaming video
  • remote control of both the keyboard and the mouse
  • a chat, allowing administrator to discuss with users
  • option to hide things from system (rootkit behavior, based on FU Rootkit)
  • accessing systems hidden by a firewall (the administrated system can form a connection outward to the administrator's computer. Optionally, to escape even more connection problems, the communication can be done by a web browser the user uses to surf the web.)
  • forming connection chains through a number of administrated systems
  • client-less remote administration over IRC
  • on-line keypress recording


Back Orifice and Back Orifice 2000 are widely regarded as malware, tools intended to be used as a combined rootkit and backdoor. For example, at present many antivirus software packages identify them as Trojan horses.[1][2][3][4][5] This classification is justified by the fact that BO2k can be installed by a Trojan horse, in cases where it is used by an unauthorized user, unbeknownst to the system administrator.

There are several reasons for this, including: the association with cDc; the tone of the initial product launch at DEF CON[6] (including that the first distribution of BO2k by cDc was infected by the CIH virus[7]); the existence of tools (such as "Silk Rope"[8]) designed to add BO2k dropper capability to self-propagating malware; and the fact that it has actually widely been used for malicious purposes.[9][10][11] The most common criticism is that BO2k installs and operates silently, without warning a logged-on user that remote administration or surveillance is taking place.[12] According to the official BO2k documentation, the person running the BO2k server is not supposed to know that it is running on their computer.[13]

BO2k developers counter these concerns in their Note on Product Legitimacy and Security, pointing out—among other things—that some remote administration tools widely recognized as legitimate also have options for silent installation and operation.[14]

See also[edit]

External links[edit]


  1. ^ Symantec press release, dated 12 July 1999, accessed 8 August 2006
  2. ^ ISS press release[permanent dead link], dated 13 July 1999, accessed 8 August 2006
  3. ^ Trend Micro press release Archived 2007-03-11 at the Wayback Machine, dated 12 July 1999, accessed 8 August 2006
  4. ^ CA threat description Archived 2007-03-12 at the Wayback Machine, dated 30 November 2005, accessed 8 August 2006
  5. ^ F-secure threat description, accessed 8 August 2006
  6. ^ report "Bad rap for Back Orifice 2000?", dated 21 Jul 1999, accessed 8 August 2006
  7. ^ ZDNet news "Back Orifice CDs infected with CIH virus", dated 14 July 1999, accessed 8 August 2006
  8. ^ "Trend Micro threat description". Archived from the original on 2002-10-20. Retrieved 2020-06-21.
  9. ^ mailing list archive, Rik van Riel report dated 3 October 2000, accessed 8 August 2006
  10. ^ Security Focus "Airport PCs stuffed with meaty goodness", dated 21 September 2005, accessed 8 August 2006
  11. ^ Microsoft Security Administrator article "Danger: Remote Access Trojans", September 2002 edition, accessed 8 August 2006
  12. ^ Bruce Schneier's Crypto-Gram Newsletter, dated 15 August 1999, accessed 8 August 2006
  13. ^ "Official BO2k Documentation: Basic Setup". Archived from the original on 2012-07-10. Retrieved 2007-05-10.
  14. ^ "Legitimacy". Archived from the original on 2005-04-07. Retrieved 2006-08-05.