How botnets work

A single computer in the network is called a zombie computer. The total number of zombie computers in the world is estimated at several million - can not be accurately determined because it is constantly growing. Worms spread by exploiting various bugs in the software or the ignorance of computer users. Currently, besides the most popular e-mail, send out new worms are also using instant messaging clients like MSN Messenger, MSN Messenger, ICQ, Konnekt, Jabber, and AIM. Experts point to a tendency to create ever smaller, and at the same time much harder to detect botnets. Already a botnet consisting of approximately 3000-7000 computers can cause serious risks if only computers connected to it have a suitably fast Internet connections.