What is a threat actor?

A threat actor is best defined as any individual or group that poses a threat to security, which encompasses a wide range of potential threats. This can include malicious hackers, cybercriminals, state-sponsored attackers, and even insider threats. The focus is on the intent and capability to cause harm or compromise security, rather than on the specific methods or tools they use.

This definition encompasses not just those who actively engage in attacks but also organizations and groups that may facilitate harm or promote vulnerabilities in systems. Understanding who threat actors are is essential for assessing risks and developing appropriate strategies to protect against various types of security threats.

In contrast, other options limit the definition and scope of a threat actor. For instance, a person trained in security systems focuses on defensive roles rather than offensive threats. An organization specializing in threat detection is more about mitigating risks rather than being the source of those risks. Lastly, software designed to block threats refers to protective measures rather than the individuals or groups that create threats, which further emphasizes that the term "threat actor" centers around those who initiate harmful actions rather than those who defend against them.