CEH

272 Chapter 11 ■ Denial of Service

Handler

Master / Attacker

Zombies

Handler

Victim

Handler

FIGURE 11.3 DDoS attack setup

A common method of covertly installing a bot on a handler or client is a Trojan horse

that carries the bot as a payload. Once the handler and subsequent zombies have been

infected, the attacker communicates remotely with the so-called botnet via communication

channels such as Internet Relay Chat (IRC) or Peer-to-Peer (P2P).