Purple Teaming: What It Is and How to Run an Effective Exercise

Purple teaming is a collaborative security exercise where offensive (red) and defensive (blue) teams work together in real time to test and improve detection and response. Instead of the red team attacking in secret and reporting weeks later, both sides share knowledge during the exercise: the red team runs a known attack technique, the blue team checks whether it was detected, and together they tune the controls until it is. The goal isn't to "win" — it's to close detection gaps fast.

Red team vs. purple team: what's the difference?

A red team simulates a real adversary covertly. Success is measured by how far they get without being caught — they emulate a specific threat actor, stay stealthy, and deliver findings at the end. The defensive (blue) team usually doesn't know an exercise is happening.

A purple team removes the secrecy. The two sides operate as one feedback loop:

• Red executes a technique and announces exactly what they did and when.
• Blue confirms whether the SIEM, EDR, or logs generated an alert.
• If nothing fired, they build or tune a detection rule and the red team re-runs the technique to validate it.

Red teaming answers "can we be breached?" Purple teaming answers "will we see it when we are?" — and fixes the answer on the spot. Purple teaming is cheaper to run repeatedly and produces immediate, measurable improvement in detection coverage.

How to run a purple team exercise with MITRE ATT&CK

Structure the exercise around a shared framework so both teams speak the same language. MITRE ATT&CK is the industry-standard knowledge base of adversary tactics and techniques, with 14 tactics and over 200 techniques catalogued from real-world intrusions. Use it as your test plan.

A practical workflow:

• Scope: Pick 10–15 ATT&CK techniques relevant to threats targeting your industry — for example, T1059 (Command and Scripting Interpreter), T1003 (OS Credential Dumping), and T1486 (Data Encrypted for Impact) if ransomware is your concern.
• Execute: Run each technique one at a time in a controlled environment. Tools like Atomic Red Team provide pre-built, ATT&CK-mapped test cases.
• Observe: For each technique, record whether you got a prevention, a detection, or nothing.
• Tune: Where detection failed, write a new rule and immediately re-test. Track your coverage as a percentage of attempted techniques detected.
• Report: Produce a coverage heatmap over the ATT&CK matrix so leadership can see exactly which tactics you can and can't detect.

The single most important metric is detection coverage improvement from start to finish — e.g. "we detected 4 of 15 techniques at the start and 13 of 15 after tuning."

Where the CIA triad fits in

Every technique you test maps back to a business risk defined by the three pillars of the CIA triad:

• Confidentiality — preventing unauthorized access (credential dumping, data exfiltration techniques).
• Integrity — ensuring data isn't altered without authorization (defense evasion, data manipulation).
• Availability — keeping systems and data accessible (impact techniques like ransomware or service destruction).

Prioritize the ATT&CK techniques that threaten the pillar your business cares about most. A healthcare provider with strict availability and confidentiality requirements should weight its purple team exercises toward credential access and impact techniques rather than, say, obscure persistence methods.

Careers: purple team jobs, salary, and certification

Purple teaming is now a recognized specialization, not just a one-off exercise. Roles appear as "Purple Team Engineer," "Detection Engineer," or "Threat Detection Analyst." A realistic roadmap looks like this:

• Foundation: Learn one offensive discipline (pen testing fundamentals) and one defensive discipline (SIEM/EDR, log analysis, detection engineering).
• Framework fluency: Get comfortable mapping real attacks to MITRE ATT&CK and writing detections in Sigma or your SIEM's query language.
• Tooling: Practice with Atomic Red Team, Caldera, and your own EDR's detection rules.
• Certification: Relevant credentials include the Certified Red Team Professional (CRTP), GIAC GCDA/GCIA on the defensive side, and dedicated purple team courses that teach adversary emulation plus detection tuning together.

Compensation tracks senior security engineering because the role demands both offensive and defensive skill — expect purple team and detection engineering salaries to sit at the upper end of the security-engineering band, typically above generalist SOC analyst pay.