Red teaming is a goal-based, stealthy, adversarial simulation across a broad scope — technical, human and sometimes physical — designed to test whether you detect and respond to a real attacker, not just whether vulnerabilities exist. It differs from a penetration test, which openly and comprehensively finds weaknesses in a defined scope. A red team assumes you already run regular pentests, have security monitoring, and have an incident-response process to exercise. If you don't, you're not ready — and a purple team (red and blue working together) is usually the better next step. Explore our red team service.
// 01 What red teaming actually is
A red team is handed an objective — reach the payment database, obtain domain admin, exfiltrate a specific dataset — and told to achieve it however a real adversary would, without being caught. That framing changes everything. Unlike a penetration test, the red team is not trying to catalogue every vulnerability; it is trying to reach a goal by the path of least resistance, using whatever works: technical exploitation, phishing and social engineering, and sometimes physical access. Crucially, the defenders — your blue team — usually don't know it's happening. That's the point: the engagement measures your detection and response under realistic conditions.
// 02 Red team vs penetration test
| Penetration Test | Red Team | |
|---|---|---|
| Objective | Find & prove vulnerabilities | Achieve a specific goal |
| Scope | Defined systems | Broad (tech + people + physical) |
| Coverage | Comprehensive | Path of least resistance |
| Stealth | Open, coordinated | Covert |
| Measures | Weaknesses | Detection & response |
| Blue team aware? | Yes | Usually no |
| Prerequisite | None | Mature vuln management |
Both are human-led and valuable, but they answer different questions. If you want to know your weaknesses, run a penetration test. If you want to know whether your security operations would catch a real intrusion, run a red team — once you're ready.
// 03 The honest signs you're not ready
A red team measures detection and response. If you have little of either, it will produce an expensive report confirming what you could have guessed. You are probably not ready if:
- You have no security monitoring or detection capability (SIEM, EDR, a SOC or managed equivalent) to evaluate.
- You have never run a penetration test, or you have unfixed findings from the last one.
- You have no incident-response process to exercise when the red team is detected.
- You're buying it for the label rather than to answer a specific question about your defences.
None of this is a criticism — it's a sequencing point. A red team is the capstone of a maturing programme, not the entry point.
// 04 The path to being ready
The route is straightforward, and each step has standalone value:
Regular pen testing
Annual (or more) penetration tests, with findings actually remediated and retested.
Detection & IR
Monitoring and an incident-response plan you've rehearsed — the thing a red team measures.
// 05 Why purple teaming is often the smarter first step
If your goal is better defences rather than a score of them, purple teaming beats a covert red team for most organisations building detection. In a purple team, the red and blue teams work together in real time: the red team runs attack techniques mapped to MITRE ATT&CK while the blue team watches, and every detection gap is found and closed on the spot. You get the adversary perspective and immediate improvement, instead of waiting weeks for a report that says you didn't see the attack. When your detection is genuinely mature, graduate to a full covert red team to prove it under realistic conditions.
// 06 Frequently asked questions
What is red teaming?
A goal-based, stealthy adversarial simulation across a broad scope (technical, human, sometimes physical) that tests whether you detect and respond to a real attacker — not just whether vulnerabilities exist. The blue team is usually unaware it's happening.
Red teaming vs penetration testing?
A pentest openly finds and proves as many vulnerabilities as possible in a defined scope. A red team pursues one objective stealthily across a broad scope and measures detection and response. Pentest: "what are our weaknesses?" Red team: "would we notice a real attacker?"
When are you not ready for a red team?
If you lack security monitoring/detection, haven't run regular pentests or haven't fixed the findings, or have no incident-response process to exercise. Without those, a red team just confirms what you already know at higher cost.
What is purple teaming?
Red and blue teams working together in real time — the red team runs techniques while the blue team watches, so detection gaps are fixed immediately. It's often a better first step than a covert red team for organisations building detection.
// 07 References
- MITRE ATT&CK — adversary tactics and techniques used to plan and map engagements.
- Related: our red team and purple team services, and what penetration testing is.