Back Orifice is one of the most common backdoor programs, and one of the most deadly. The name may seem like a joke, but sure, the threat is real. Back Orifice was established in Cult of the Dead Cow group. Back Orifice is an Open Source Program. The main Threat of this software is that by making some changes in the code anybody can make it undetectable to the Anti virus Program running on the Victim’s computer. Apart from the strange title, the program usually gets port 31337, the reference to “Lit” phenomenon is popular among hackers.
Back Orifice uses a client-server model, while the server and client is the victim attacker. What makes Back Orifice so dangerous that it can install and operate silently. There is not required interaction with the user in, meaning you could its on your computer right now, and do not know.
Companies such as Symantec have taken steps to protect computers against programs that they consider dangerous. But even more attacks using Back Orifice 2000. This is due partly to the fact that it is still evolving, as open source. As stated in the documentation the goal is ultimately the presence of the Back Orifice 2000 unknown even to those who installed it.
Back Orifice 2000, developed for Windows 95, Windows 98, Windows NT, Windows 2000 and Windows XP.
Where can I download Back orifice 2000?
Back Orifice 2000 can be downloaded at the following address: http:*//sourceforge.net/*projects*/bo2k/ (remove *)
I infected! How do I remove it?
1. Click Start> Run, and type “Regedit”(without the quotes)
2. Follow the path below: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServices “
3. Now looking in the right box: “The umgr32 = ‘c: \ windows \ system \ umgr32.exe”
4. Right-click on this entry and click Remove. Now restart your computer.
5. After restarting only open Windows Explorer. Make sure you can see all registered extensions. To do so, select “View Options and configure the appropriate settings.
6. Go to the WINDOWS \ SYSTEM directory, and find “umgr32.exe” file. Once you find it, delete it.
7. Exit Windows Explorer and reboot again.
source- Google :)
Regards - eddy aka ethi hackah