A zombie is a compromised computer that’s infected with a Trojan and is controlled remotely by the attacker. They’re combined into a botnet.
Botnet
Botnets are used to do the following :
- Distributed Denial of Service (DDoS) attacks : Overwhelming a system with traffic from the botnet.
- Spamming : Sending out large volumes of spam emails.
- Data theft : Harvesting sensitive info. from the zombie.
- Click fraud : Generating fake clicks, views, etc.