MITRE ATT&CK
ATT&CK is a shared catalogue of what adversaries have actually been observed doing, organised by tactic and technique.
Its value is a common vocabulary: detections, intelligence, testing and gap analysis can all reference the same identifiers. It describes behaviour rather than prescribing controls, which makes it a map of what to be able to see rather than a list of what to buy.
Checked against the primary source.
