Purple Teaming: Turning Offense Into Detection
There is a failure mode in red teaming that looks like success: the red team achieves its objective, writes a report proving you were exposed, and leaves — and six months later you are exposed to the same technique because nothing about your detection actually changed. Purple teaming fixes that. It puts the attackers and defenders in the same room, running attacks collaboratively so that every technique either gets caught or becomes a detection you keep. Offense stops being a scoreboard and becomes a way to build defence.
"Purple" is red and blue working together rather than in opposition. Instead of the red team attacking in secret and revealing the results at the end, the two sides collaborate in real time: the red team executes a specific technique, the blue team watches their telemetry to see whether it was detected, and together they close the gap on the spot. The output is not a list of the ways you lost — it is a set of validated, improved detections for the techniques that matter to you.
From one-time result to lasting capability
The distinction that makes purple teaming worth it is durability. A classic red-team finding is a moment in time — you were beaten by technique X on this date. A purple-team finding is a capability — you can now detect technique X, and you have the detection to prove it, forever. The exercise converts the ephemeral value of "we got caught being exposed" into the permanent value of "we built the detection that closes it." Every session should leave your detection coverage measurably higher than it started.
Structured around real technique
Good purple teaming is methodical, not a free-for-all. It works technique by technique against a framework like MITRE ATT&CK, deliberately covering the behaviours relevant to your actual threat model. For each one the question is concrete: can we execute it, do we detect it, and if not, what would we need to change? This turns an abstract worry — "could we catch a real attacker?" — into a coverage map you can point at, with gaps that are specific and fixable rather than vague and dreaded.
- Run it collaboratively and in the open. The value is in the shared learning moment, not in a surprise. Red and blue watching the same technique together is the whole point.
- Map to a framework. Working through ATT&CK techniques systematically turns ‘are we covered?’ into a specific, prioritised list rather than a feeling.
- Keep every detection you build. The retained, versioned detection is the deliverable. A session that ends with no lasting detection was a demo, not a purple team.
- Re-run to prevent regression. Detections break as environments change. Periodically re-testing the techniques you closed confirms they’re still closed.
- Pick one technique you believe you’d detect — say, a common credential-dumping method — and have someone safely execute it while you watch your tooling. Whether it fires or not, you’ve just learned something concrete about your coverage.
- Ask whether your last offensive exercise left behind any new, retained detections. If the answer is ‘just a report,’ you paid for a finding and banked no lasting defence.
Running structured, technique-by-technique purple-team exercises that leave your team with validated, retained detections — not just a report — is exactly what our assessment and SecStudio agents are built to deliver, turning every attack into a defence you keep.
Purple teaming is the most efficient way to convert offensive effort into defensive capability, because nothing is wasted — every technique tested either confirms a detection works or produces a new one. It reframes the whole point of attacking yourself: not to prove you can be beaten, which is always true, but to systematically shrink the set of attacks that would go unnoticed. And you can only build detections for the techniques you thought to test against the environment you actually mapped.