Threat actor attribution is the process of linking a cyber incident, campaign, or artifact to a specific group, operator, or sometimes a state-linked team. It may be based on malware code, infrastructure, tactics, victim profile, language clues, or reuse of credentials and tooling. Attribution is often probabilistic, not absolute, because attackers can copy each other, reuse public tools, or deliberately plant false clues.
In cyber security, attribution matters because it helps defenders understand motivation, likely targets, and future behavior, and it can support hunting, detection engineering, and legal or policy decisions. In real attacks, a claim may name a known group and attach a hash, but that alone does not prove breach or identity. Good analysis separates evidence from assertion and validates attribution with logs, endpoint telemetry, network activity, and other independent indicators before treating the link as reliable.