What is a botnet asks Security Focus?
Today it's an illegal collection of hundreds, thousands, tens of thousands or even hundreds of thousands of compromised computers all being controlled with a common infrastructure. There's even one case where a real botnet was found with about 1.5m machines under one person's control. Incredible. According to Symantec's latest Internet Threat Report, 26 per cent of all bot-infected computers are also located in the United States, making it the number one source of bots