Security teams have become adept at probing individual defenses: whether an EDR agent blocks a specific payload, if a phishing simulation trips up users, or whether a SIEM rule fires on a given technique. But this piecemeal approach, the source argues, overlooks the fundamental nature of real attacks. Adversaries rarely rely on a single technique; they string together multiple steps—initial access, privilege escalation, lateral movement, exfiltration—into a coherent chain that achieves their objective.
Testing each link in isolation gives a false sense of security. A control might block a particular technique in a vacuum, yet fail when that technique is preceded or followed by others that alter the context, timing, or state of the system. The source contends that mature organizations already recognize this and are moving toward attack-chain simulation, where the entire sequence is rehearsed end-to-end. This approach reveals how techniques interact and where gaps emerge between controls.
The takeaway is not that individual testing is useless, but that it is insufficient. Security validation should mirror the adversary's playbook: full chains, not isolated moves. Only by testing the whole path can teams see what an attacker would actually experience—and what they would actually get away with.