Trojan Horse is Not Virus!
Strickly speaking, a trojan horse is NOT a virus because it does
not replicate like ordinary viruses do. A trojan horse is an unfriendly
program which will appear to be something other than what it is, for example
a program that is disguised as a legitimate software program.
Below are some common trojans:
Back Orifice 2000 : BO2K allows outsiders to access and modify
any information on a Windows 95, 98 and NT machines through an
invisible server program installed by the program. It also allows
outsiders to spy on what user is doing. BO2K is expected to be released
on 10/7/1999. Users are advised not to run executables from un-secured
source and updates their antivirus tools periodically.
Details can be found at
Back Orifice: This trojan horse allows an intruder to monitor
and tamper with Windows 95 and Windows 98 computers over the Internet.
There is no easy way for a computer user to know the attack is taking
place, and there is no easy way to stop the attack once Back Orifice has
installed itself on the computer. The ver 1.2 of Back Orifice cannot be
installed on Windows NT system. Click
NetBus: NetBus is a remote administration tool, much like the
infamous Back Orifice tool. However, Netbus predates Back Orifice by
several months and is also capable of working under Windows NT in
addition to Windows 95 and 98. Click
here for details.