What types of threats exist on these servers? These servers can host exploit kits, which are malicious tools that attackers use to compromise your computer. Kits are methods of injecting malware onto an unsuspecting user’s device through a software vulnerability. The Botnet Command and Control Center is the main controller of the botnet. Botnets are computers infected with malware that allow a hacker to take control in order to send spam, malware and spyware, and control other computers.