A Distributed Denial of Service (DDoS) is a DoS attack that is carried out in a network from many computers. Incybercrime, it is often carried out in botnets. The DDoS attack is launched from different computers at the same time, making it difficult to locate and even more difficult to stop.
As with the DoS attack, in the DDoS attack the attacked computer is bombarded with faulty and intentionally misaddressed IP packets, intensively until the attacked server has to stop its service or crashes.
The DDoS attacks are coordinated from the attacker or the botnet operator, who can activate the malware, spams or Trojans dropped on the infected botnet machines at the same time. Since the actual attacks are carried out via the many botnet computers, it is difficult to determine the originator, especially since fast-fluxing is often used, which means that the domain names change permanently.