Purple Team

A purple team is not usually a standing team at all — it's a way of working in which the offensive red team and the defensive blue team run an exercise together, in the open, iterating in real time. Where a classic red-team engagement is adversarial and unannounced (attack now, report in six weeks), a purple-team exercise is collaborative and immediate: execute a technique, check whether the defenders saw it, adjust the detection or the process, and run it again the same afternoon. The color mix is the point — the goal isn't for red to "win" but for blue to measurably improve before the engagement ends.

How it works

A purple-team session picks specific techniques — often mapped to frameworks like MITRE ATT&CK — and walks through them one by one: red executes, both teams watch the monitoring together, and every gap becomes an immediate fix-and-retest rather than a finding in a distant report. The same loop applies cleanly to the human layer. Red sends a targeted phishing lure while blue watches whether user reports arrive and how fast triage happens; red calls the help desk with a researched pretext while blue checks whether verification procedures hold and whether the failed attempt generates any alert; red drops lookalike-domain emails while blue tests whether finance's callback rule actually fires. Social engineering techniques are ideal purple-team material precisely because their detection depends on people and process — things that can be fixed and retested within hours, unlike a product vulnerability.

How to benefit

Use purple teaming as the tuning stage between training and full adversarial testing. Run the collaborative loop until detections, reporting flows, and verification procedures hold under a cooperative attacker, then validate with an unannounced red-team engagement — and feed both sets of results into simulation programs and your human risk metrics so improvement is tracked, not anecdotal. Teams that skip straight to adversarial testing pay a red team to document gaps a purple-team afternoon would have fixed.