Red Team vs Blue Team vs Purple Team: Which One Do You Need First?

Red team, blue team and purple team describe three different jobs in cyber security, not three ranks of the same job. A red team tries to break in, a blue team tries to stop them, and a purple team is the exercise where both compare notes. The question most IT managers actually need answered is not what the words mean. It is which one their business should commission next, and in what order.

The Order Most Businesses Get Wrong

It is tempting to jump straight to the most dramatic option. Red teaming sounds impressive, and plenty of vendors are happy to sell it. But a red team exercise against an organisation with no monitoring in place mostly proves what everyone already suspected: that nobody was watching.

The UK’s National Cyber Security Centre compares a penetration test to a financial audit. It checks that internal processes are actually working, rather than replacing those processes in the first place. The same logic scales up. Blue team basics come first, testing comes second, and red or purple team work comes once there is something worth stress-testing.

Red Team: What It Tells You, and What It Assumes

The US National Institute of Standards and Technology defines a red team as a group “authorized and organized to emulate a potential adversary’s attack or exploitation capabilities.” That is a formal way of saying they behave like a real intruder, chaining weaknesses across systems and people rather than checking one box at a time.

Because a red team exercise is often unannounced to the organisation’s own defenders, it assumes there is a defensive function worth testing. Skip that step and you are not measuring detection, because there was nothing there to detect anything in the first place.

Blue Team: The Job That Never Stops

NIST’s definition of a blue team is the group “responsible for defending an enterprise’s use of information systems by maintaining its security posture.” Where a red team engagement has a start and end date, blue team work is continuous. It means watching a SIEM platform such as Splunk or the ELK stack, and running endpoint detection and response tools. It also means hunting for the things automated alerts miss, according to Aardwolf Security’s own guidance for security practitioners.

This is the part of the puzzle businesses most often underfund, because it does not produce a dramatic report the way a red team engagement does. It just quietly reduces how much damage every other kind of attack can do.

Purple Team: Where the Other Two Meet

Wikipedia’s overview of the practice calls a purple team “the temporary combination of both teams,” assembled so red and blue can compare findings while the exercise is still happening rather than weeks later in a written report. It is not a department anyone hires permanently. It is a structured way of running the exercise.

MITRE’s ATT&CK framework is described on its own site as “a globally-accessible knowledge base of adversary tactics and techniques based on real-world observations.” It gives both sides something to point at together. A red teamer no longer describes an attack in one vocabulary while a blue teamer checks logs in another. Both work from the same list of techniques instead.

A Simple Way to Decide What You Need Next

1. No regular testing yet? Start with a scoped penetration test. It is cheaper, faster to arrange, and gives you a baseline.
2. Testing in place but no dedicated monitoring? Invest in blue team capability, whether that is in-house staff, a managed detection service, or both.
3. Both of those already working? A red team assessment will tell you how they hold up against a realistic, sustained attempt.
4. Already running red team exercises? A purple team format gets more value from each one, because the lessons get shared in real time instead of buried in a report nobody rereads.

If you are not sure which stage your business is at, that is a normal position to be in. A short conversation with a penetration testing provider usually places you within a few minutes. Feel free to get in touch and talk it through before committing to anything.

Red Team vs Blue Team vs Purple Team at a Glance

Signs You Are Choosing for the Wrong Reasons

A few patterns crop up again and again when a business ends up buying the wrong service. Watch out for these before signing anything.

• A provider recommends a red team exercise before asking a single question about your current monitoring. That is a sales pitch, not a proper scoping conversation.
• Nobody can tell you what a “purple team” service actually includes beyond a vague promise of collaboration. Ask them to describe the exercise format directly.
• Your last penetration test findings are still open, and someone is proposing a bigger, more expensive engagement instead of fixing what the last one found.
• You are choosing based on what a competitor did, rather than what your own security programme actually needs right now.

None of that means red or purple team work is a bad idea. It means sequencing matters, and a good provider will tell you to wait if you are not ready, rather than book the engagement anyway. A short scoping call should always come before a quote, and if it does not, treat that as a warning sign on its own.

Frequently Asked Questions

What is the difference between a red team and a penetration test?

Scope and secrecy, mainly. A penetration test targets an agreed system in an agreed window, with defenders aware it is happening. A red team engagement is broader and often unannounced, so it tests detection as much as the breach itself.

Can a small business realistically run all three?

Not usually at once, and it does not need to. Most small and mid-sized organisations build up to it: testing first, defensive monitoring second, red or purple team work once both are established.

Is purple teaming just a marketing term?

No, though it gets used loosely. At its core it describes a specific format, red and blue working the same exercise together, rather than a red team report landing on a blue team’s desk afterwards.

Do blue teams use the same tools everywhere?

The categories are consistent even if the products differ: SIEM platforms for log analysis, EDR tools on endpoints, and threat hunting to catch what automated alerts do not.

How do we know if we are ready for a red team exercise?

If you already have monitoring in place and recent penetration test findings have mostly been remediated, you are in a reasonable position to consider it. If not, address those first.

What does a purple team exercise actually look like on the day?

Typically both teams sit in the same session, live or joined remotely. The red side runs a technique, and the blue side checks in real time what their tools logged and alerted on. Any gap gets discussed immediately instead of waiting for a final report.