The most potent weapon for Web gangsters is the botnet. A bot, broadly speaking, is a remote-controlled software program that is installed on a computer without the owner’s knowledge. Hackers use viruses, worms, or automated programs to scan the Internet in search of potential zombies. One recent study found that a new P.C., attached to the Internet without protective software, will on average be infected in about twenty minutes.
In the most common scenario, the bots surreptitiously connect hundreds, or thousands, of zombies to a channel in a chat room. The process is called “herding,” and a herd of zombies is called a botnet. The herder then issues orders to the zombies, telling them to send unsolicited e-mail, steal personal information, or launch attacks. Herders also trade, rent, and sell their zombies. “The botnet is the little engine that makes the evil of the Internet work,” Chris Morrow, a senior network-security engineer at M.C.I., said. “It makes spam work. It makes identity fraud work. It makes extortion, in this case, work.”
Less than five years ago, experts considered a several-thousand-zombie botnet extraordinary. Lyon now regularly faces botnets of fifty thousand zombies or more.
The Zombie Hunters
On the trail of cyberextortionists (New Yorker)
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