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Red Team vs Blue Team vs Purple Team: The Complete Guide to Security Operations

Red Team vs Blue Team vs Purple Team: The Complete Guide to Security Operations

Red team, blue team, purple team: what's the difference

Security teams organize into offensive (red), defensive (blue), and collaborative (purple) roles. Here's what each does.

Red team

Red teamers simulate real attackers. The goal is to test whether defenses actually work against someone trying to break in - not just whether they exist on paper.

What they do:

  • Gain initial access (phishing, exploiting public-facing services, physical intrusion)
  • Establish persistence without getting caught
  • Move laterally through the network
  • Reach objectives: domain admin, sensitive data, critical systems

How it differs from pentesting: Pentests have defined scope and timeframes. Red team engagements are goal-oriented and may use any technique an attacker would - social engineering, physical access, custom malware. The blue team usually doesn't know it's happening.

Tools: C2 frameworks (Cobalt Strike, Sliver), custom implants, social engineering platforms.

Blue team

Blue teamers build and maintain defenses. They're the ones watching dashboards, writing detection rules, and responding when something goes wrong.

What they do:

  • Monitor security events through SIEM
  • Write and tune detection rules
  • Hunt for threats that evade automated detection
  • Respond to incidents
  • Manage vulnerabilities and patches

Tools:EDR solutions, network detection systems, SIEM platforms, threat intelligence feeds.

Purple team

Purple teaming puts red and blue in the same room. Instead of red team running an engagement and delivering a report weeks later, both sides work together in real time.

How it works:

  • Red team executes a specific technique (say, Kerberoasting)
  • Blue team tries to detect it
  • If detection fails, they figure out why and fix it immediately
  • Repeat for the next technique

Why it matters: Traditional red team engagements produce reports that sit in backlogs. Purple teaming creates immediate feedback loops. Defenders learn attacker techniques; attackers learn what gets detected.

When to use each

This depends on your maturity level:

  1. Starting out: Focus on vulnerability assessments and basic pentesting
  2. Intermediate: Add periodic red team engagements to test defenses
  3. Mature: Implement purple team exercises for continuous improvement

If your blue team can't detect basic attacks, a full red team engagement will just produce a long list of failures without actionable improvements. Build detection capability first.