Red Team vs Blue Team vs Purple Team Explained

The red team vs blue team model is a foundational concept in cybersecurity operations. Borrowed from military war games, the terminology has been adapted to describe the adversarial dynamics of modern security programs. Understanding each team’s role, tools, and objectives — and how purple teams bridge the gap — is essential for anyone pursuing a career in security or trying to build a mature security organization.

Red Team: The Simulated Adversary

A red team operates as a realistic adversary. Unlike a penetration test — which typically focuses on discovering as many vulnerabilities as possible within a defined scope — red team engagements simulate a specific threat actor’s TTPs (Tactics, Techniques, and Procedures) to test an organization’s ability to detect and respond to a real attack.

Red Team Objectives

• Achieve specific mission objectives: Exfiltrate a particular file, reach a specific system, or demonstrate domain compromise
• Operate with stealth: Avoid detection by the blue team throughout the engagement
• Validate defensive controls: Prove or disprove whether security investments actually stop attackers
• Emulate real threat actors: Use techniques documented by groups like APT29, Lazarus, or FIN7

Red Team Methodology

Red team engagements typically follow a kill chain:

1. Reconnaissance: OSINT, LinkedIn scraping, Shodan, certificate transparency
2. Initial Access: Phishing, exploiting public-facing applications, supply chain
3. Execution: Running implants, living off the land
4. Persistence: Scheduled tasks, registry keys, WMI subscriptions
5. Privilege Escalation: Kerberoasting, token impersonation, misconfigurations
6. Defense Evasion: AMSI bypass, log clearing, process injection
7. Lateral Movement: Pass-the-hash, psexec, WMI
8. Exfiltration: DNS tunneling, HTTPS to C2 server

Red Team Tools

Category	Tools
C2 Frameworks	Cobalt Strike, Brute Ratel C4, Sliver, Havoc
Phishing	GoPhish, Evilginx2, modlishka
AD Attacks	Impacket, BloodHound, Rubeus, Mimikatz
Evasion	Donut, Scarecrow, Shellter, manual syscall techniques
Recon	Maltego, Amass, Shodan, theHarvester
Post-Exploitation	PowerSploit, Covenant, Empire

MITRE ATT&CK for Red Teams

The MITRE ATT&CK framework documents real-world adversary behaviors in a structured taxonomy. Red teams use it to:

• Plan operations: Choose techniques that emulate specific threat actors
• Ensure coverage: Make sure the engagement tests techniques across multiple tactics
• Report findings: Map discovered gaps to ATT&CK technique IDs (e.g., T1059.001 — PowerShell)

Browse the matrix at attack.mitre.org and use the ATT&CK Navigator to build heat maps of techniques covered.

Blue Team: The Defenders

The blue team is responsible for protecting, monitoring, and responding to threats. They operate the security infrastructure and investigate alerts generated by both real attackers and red team simulations.

Blue Team Responsibilities

• Security Operations Center (SOC): Monitor SIEM alerts, investigate incidents, triage threats
• Incident Response (IR): Contain, eradicate, and recover from breaches
• Threat Intelligence: Track emerging TTPs and apply them to detection engineering
• Hardening: Patch management, configuration baselines, attack surface reduction
• Detection Engineering: Write detection rules in SIEM and EDR platforms

Blue Team Tools

Category	Tools
SIEM	Splunk, Microsoft Sentinel, Elastic SIEM, IBM QRadar
EDR	CrowdStrike Falcon, SentinelOne, Microsoft Defender for Endpoint
Network Analysis	Zeek (Bro), Wireshark, Suricata, NetworkMiner
Log Management	Graylog, Logstash, Fluentd
Threat Intel	MISP, OpenCTI, VirusTotal, Recorded Future
DFIR	Velociraptor, Volatility, KAPE, Autopsy

MITRE ATT&CK for Blue Teams

Blue teams use ATT&CK to build detection coverage maps. Each technique has documented data sources — the logs and telemetry needed to detect it. For example:

• T1059.001 PowerShell: Requires PowerShell script block logging (Event ID 4104) and command-line auditing (Event ID 4688)
• T1003.001 LSASS Memory: EDR process access monitoring, Event ID 4656/4663 on lsass.exe

Use the ATT&CK Navigator to visualize which techniques you have detections for and identify blind spots.

Purple Team: Bridging the Gap

Purple teaming is a collaborative approach where red and blue team members work together in real-time, rather than the red team operating in secrecy. The goal is to maximize learning — the blue team sees exactly what the red team is doing and can immediately measure whether their detections fire.

Purple Team Exercise Structure

1. Select a technique: Choose from ATT&CK (e.g., T1055.001 — Dynamic-link Library Injection)
2. Red team executes: The red team runs the technique on a test system
3. Blue team checks: Did the SIEM alert fire? Did the EDR detect it?
4. Gap identified: If no alert, the blue team writes a new detection rule
5. Validate: Re-run the technique and confirm detection
6. Document: Record the detection, its coverage, and any evasion variants

Purple Team Tools

• Atomic Red Team (Red Canary): A library of small, focused ATT&CK test scripts for any platform:

# Install on Linux/macOS
gem install atomicredteam

# Run a specific technique (PowerShell execution - T1059.001)
Invoke-AtomicTest T1059.001

• VECTR: A collaborative platform for tracking purple team exercises and measuring detection coverage
• Caldera (MITRE): An automated adversary emulation platform for running ATT&CK-mapped operations
• Prelude Operator: A commercial purple team platform

Career Paths

Breaking Into Red Teaming

Red teaming is not an entry-level role. Most practitioners start with:

1. Penetration testing: Build offensive skills and methodology
2. CTF competitions: HackTheBox, TryHackMe, PicoCTF build practical skills
3. Home labs: Set up Active Directory labs, practice with Impacket, Cobalt Strike trial

Relevant certifications:

• OSCP (Offensive Security Certified Professional) — the industry standard starting point
• CRTO (Certified Red Team Operator) — focused on Cobalt Strike and AD
• CRTE (Certified Red Team Expert) — advanced AD attacks
• CRTL (Certified Red Team Lead) — operational planning and leadership

Breaking Into Blue Teaming

Blue team roles are more accessible to newcomers:

1. SOC Analyst (Tier 1/2): Alert triage, incident escalation — the typical entry point
2. Threat Intelligence Analyst: Researching adversary groups and IOCs
3. Detection Engineer: Writing SIEM and EDR detection rules
4. Incident Responder: Hands-on forensics and containment

Relevant certifications:

• CompTIA Security+ — foundational
• Blue Team Labs Online (BTLO) certifications — practical, hands-on
• Splunk Core Certified User/Power User
• Microsoft SC-200 (Security Operations Analyst)
• GCIA / GCIH (GIAC) — network and incident handling

Purple Team Roles

Purple teaming is typically not a standalone career path but a function performed by experienced red or blue team members. Seek out organizations that run formal purple team exercises as part of their security program.

Which Path Is Right for You?

Prefer	Consider
Breaking things, creative problem solving, stealth	Red Team
Defending, forensics, log analysis, detection	Blue Team
Collaboration, teaching, measuring security	Purple Team

Both sides benefit enormously from understanding the other’s perspective. The best red teamers understand how detections work and deliberately evade them. The best blue teamers understand attacker techniques well enough to write precise, low-noise detection rules. Purple team exercises are the fastest way to compress that cross-pollination of knowledge.