Red Team vs Purple Team: Which Fits Your Security?

This article compares red team and purple team penetration testing to help you decide which approach fits your organization’s security needs. You’ll learn what each team does, how they differ, and the key factors to consider when choosing. By the end, you’ll know which engagement type—or combination—makes sense for your maturity level, budget, and goals.

What Is a Red Team Engagement?

A red team engagement is an adversarial simulation where a team of security professionals acts like real attackers. They use the same tactics, techniques, and procedures (TTPs) as threat actors—reconnaissance, exploitation, lateral movement, privilege escalation, and data exfiltration—to test your entire security posture. Unlike a standard vulnerability scan or penetration test, a red team doesn’t just look for weaknesses; it tries to achieve specific objectives, such as accessing a critical server or stealing sensitive data, without being detected.

Red team engagements are typically goal-oriented and time-boxed. The team operates with minimal knowledge of your environment (or none at all, in a “black box” scenario) and is often allowed to use social engineering, physical intrusion, or phishing. The primary output is a detailed report that shows the attack path, what was compromised, and how long the team remained undetected.

What Is a Purple Team Engagement?

A purple team is not a separate group of attackers or defenders; it’s a collaborative exercise that combines the red team’s offensive skills with the blue team’s defensive knowledge. The term “purple” comes from mixing red (attack) and blue (defense). In a purple team engagement, the red and blue teams work together in real time, sharing information about attack techniques and defensive responses. The goal is to improve detection and response capabilities, not just to find vulnerabilities.

During a purple team exercise, the red team may simulate an attack while the blue team monitors their actions, asks questions, and adjusts detection rules on the fly. The output is often a set of actionable improvements: new alert rules, updated playbooks, or training recommendations. This approach is highly effective for validating that your security operations center (SOC) can actually detect and respond to the attacks you’re most worried about.

Key Differences: Red vs Purple

The table below highlights the main differences between the two approaches.

• Objective: Red team aims to breach defenses and achieve a specific goal; purple team aims to improve detection and response.
• Collaboration: Red team operates in isolation from defenders; purple team actively shares information between attackers and defenders.
• Scope: Red team tests the full attack chain, including physical and social vectors; purple team typically focuses on specific attack scenarios or TTPs.
• Outcome: Red team produces a report of vulnerabilities and attack paths; purple team produces improvements to monitoring, alerting, and response processes.
• Timeframe: Red team engagements can last weeks or months; purple team exercises are often shorter, lasting days or a week.

How to Choose Between Red and Purple

Choosing between red and purple teaming depends on your organization’s security maturity, budget, and specific goals. Here are the key factors to consider:

1. Security maturity: If you’re just starting to build your security program, a purple team is often more valuable because it helps your defenders learn and improve. If you have a mature SOC with robust monitoring, a red team can validate its effectiveness.
2. Budget: Red team engagements are typically more expensive due to their length and complexity. Purple team exercises are usually more cost-effective because they’re shorter and more focused.
3. Compliance requirements: Some regulations require regular penetration testing, which a red team can fulfill. Purple teaming is not a substitute for compliance-mandated testing but can complement it.
4. Specific concerns: If you want to test a particular incident response plan or a new security tool, a purple team is ideal. If you want to know whether an attacker can reach your crown jewels, a red team is better.

Common Misconceptions and Pitfalls

One common misconception is that a red team is always better than a standard penetration test. In reality, a red team is a form of penetration testing, but it’s more advanced and expensive. For many organizations, a standard pen test is sufficient to meet compliance and identify critical vulnerabilities.

Another pitfall is treating a purple team as a “lite” version of a red team. That’s not accurate—purple teaming requires a different mindset and skill set. It’s not about finding more vulnerabilities; it’s about improving the blue team’s ability to detect and respond. If your organization doesn’t have a dedicated blue team or SOC, a purple team exercise may not be effective.

Also, beware of “red team fatigue”—running a red team engagement too frequently can lead to alert fatigue and desensitization. Similarly, a purple team exercise that isn’t well-planned can become a chaotic free-for-all. Both require clear objectives, scope, and rules of engagement.

Costs and Resource Considerations

Red team engagements are typically the most expensive type of security testing, often costing tens of thousands of dollars or more, depending on the scope and duration. They require highly skilled testers, and the engagement may involve multiple phases over several weeks. In contrast, purple team exercises are generally less expensive because they’re shorter and more focused. However, they still require significant time from your internal security team, who must be actively involved in the exercise.

Beyond monetary cost, consider the resource drain on your staff. A red team engagement can be disruptive, as your SOC may be chasing false alarms or dealing with real attacks. A purple team exercise is more collaborative and can actually upskill your staff, but it requires dedicated time and attention.

Safety and Legal Considerations

Both red and purple team engagements involve simulated attacks that can cause real disruptions if not managed carefully. Always ensure you have written authorization from senior management and that the scope is clearly defined. Avoid testing systems that could cause physical harm or violate laws (e.g., attacking third-party systems). For purple team exercises, ensure that any changes to detection rules are reversible and that you have a rollback plan.

Frequently Asked Questions

Can I do both red and purple teaming?

Yes, many organizations do both, but often at different times. A common approach is to run a red team engagement to identify weaknesses, then follow up with a purple team exercise to address the gaps in detection and response. This combination provides a comprehensive view of your security posture.

Is a red team the same as a penetration test?

No, a red team is a specific type of penetration test that focuses on simulating a real attacker’s full kill chain, including evading detection. Standard penetration tests are typically less adversarial and focus on identifying vulnerabilities in a specific scope.

How long does a red team engagement take?

Red team engagements typically last 2-4 weeks, but can extend to several months for complex environments. The duration depends on the scope, objectives, and the level of stealth required.

Do I need a purple team if I already have a SOC?

If you have a SOC, a purple team exercise is highly beneficial to validate that your SOC can actually detect and respond to real attacks. It’s a practical way to test your detection rules and incident response playbooks.

What qualifications should I look for in a red team provider?

Look for providers with certifications like OSCP, OSCE, or CREST, and ask for references from similar organizations. Ensure they have experience with your technology stack and can provide a detailed report with actionable recommendations.

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