What is Purple Teaming?
Purple Teaming is a collaborative security practice in which offensive (red) and defensive (blue) teams work together in real time to test attacks, observe how defenses respond, and immediately improve detection and response capabilities. It is used to close gaps between what attackers do and what defenders can see.
What it is
Purple Teaming is a structured collaboration between the people who simulate attacks and the people who defend against them. In a traditional red team exercise, attackers operate in secret and defenders only see results after the fact. Purple Teaming removes that separation. Both sides work in the same room, or on the same call, at the same time.
A typical session looks like this:
- The red team executes a specific attack technique, such as credential dumping or lateral movement via a remote service.
- The blue team watches their detection tools, such as a SIEM or XDR platform, to see whether an alert fires.
- If no alert fires, the detection engineering team writes or tunes a rule on the spot.
- The red team runs the technique again to confirm the new detection works.
- The cycle repeats across a list of techniques, often mapped to the MITRE ATT&CK framework.
The output is a set of confirmed, tested detections rather than a report that sits unread.
Why it matters
Red team reports often list findings that the blue team cannot act on quickly. Purple Teaming converts those findings into working detections during the exercise itself. Teams leave with measurable coverage improvements, not just a list of gaps. It also builds shared knowledge. Defenders learn how attacks actually look on the wire and in logs. Attackers learn which of their techniques are already caught, so future exercises focus on real blind spots.
How tools address it
Purple Teaming is a practice, not a product. However, several tool categories support it directly. Adversary emulation platforms in the Red-Team & Adversary Emulation category can replay specific ATT&CK techniques on demand, giving the red team a repeatable playbook. Detection Engineering platforms help the blue team write and test rules in real time. SIEM and XDR tools provide the log and alert visibility the blue team monitors during each technique run. Cyber Range environments let teams run exercises in isolated labs without touching production systems.