Wednesday, November 23, 2005

2. NetBus

This backdoor Trojan first appeared in 1998 as a way to play pranks by flipping a user’s screen upside down, opening and closing the tray to the optical drive, and performing other seemingly harmless actions. However, installing the server version of NetBus lets a hacker use a remote computer to manipulate and control the victim’s computer.
There have been many reincarnations of NetBus over the last few years, and there are other backdoor Trojans, such as Back Orifice, that use similar techniques. The social engineering varies, but some messages entice users to launch NetBus by claiming it is a patch to repair a software problem or by coupling it with a game called Whack-A-Mole.
Once a user installs NetBus, a hacker can access files, programs, and even printers via his system. And because a victim’s computer essentially becomes a zombie, a hacker also can use it to transmit DoS attacks. NetBus behaves very much like networking software in that it installs server software on a victim’s computer that interacts with a hacker’s client software.


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