Red Team vs. Penetration Test: A Practical Guide to Choosing the Right Security Assessment for Your Organization
Pentestas Team
Security Analyst
💫 Key Takeaways
- A penetration test finds vulnerabilities in a defined scope. A red team engagement tests whether your security team can detect and stop a realistic attack.
- If you haven't done at least 3 thorough penetration tests and remediated the findings, you are not ready for a red team
- Red teams that find critical vulnerabilities in the first hour aren't testing detection — they're doing an expensive pen test
- The right assessment depends on your security maturity, not your budget or what sounds more impressive to the board
- Purple teaming — collaborative testing between attackers and defenders — delivers more value per dollar than either approach alone for most organizations
Last quarter, we had a conversation with the CISO of a mid-size healthcare company. She wanted to hire us for a red team engagement. Her reasoning: the board had read about a competitor's breach in the news and wanted assurance that their security was battle-tested. Red teaming sounded appropriately aggressive.
We asked a few questions. Did they have an internal SOC or managed detection and response (MDR) service? No — they relied on antivirus alerts and manual log reviews. Had they conducted penetration tests before? Once, two years ago, on their public-facing web application only. Did they have an incident response plan? A draft document from 2023 that no one had tested.
We told her the truth: a red team engagement would be a waste of her budget. Without detection capabilities in place, the red team would move through their environment unopposed, and the final report would essentially say “you have no ability to detect or respond to attacks.” That's useful information, but you don't need a $150,000 engagement to learn it.
What she needed was a comprehensive penetration test across her network, applications, and cloud infrastructure, followed by remediation, followed by building basic detection capabilities. Then a red team engagement would provide genuine value by testing whether those defenses actually work under pressure.
Clear Definitions
What Each Assessment Actually Tests
| Dimension | Penetration Test | Red Team Engagement |
|---|---|---|
| Primary goal | Find as many vulnerabilities as possible within a defined scope | Test the organization's ability to detect, respond to, and contain a realistic attack |
| Scope | Defined and agreed upon before testing begins (specific apps, networks, or systems) | Broad, often the entire organization. Scope restrictions are minimal. |
| Who knows | IT team is informed. Often IT provides credentials, documentation, and network access. | Only executive sponsor and legal know. The SOC/security team is being tested and should not be informed. |
| Stealth | Not a priority. Testers may run noisy scans because detection evasion isn't the point. | Critical. Red teamers operate covertly, mimicking real adversary tradecraft and TTPs. |
| Duration | 1–4 weeks typically | 4–12 weeks. Sometimes longer for persistent campaigns. |
| Typical cost | $10,000 – $80,000 depending on scope | $40,000 – $250,000+ depending on objectives and duration |
| Deliverable | Detailed vulnerability report with CVSS scores, proof-of-concept exploits, remediation guidance | Attack narrative, detection gap analysis, recommendations for improving security operations |
The analogy I use with clients: a penetration test is like hiring a locksmith to check every lock in your building and tell you which ones can be picked. A red team engagement is like hiring someone to break in without getting caught, and seeing if your security guards, cameras, and alarm systems notice.
If you don't have security guards, cameras, or alarms yet, testing whether they work is a meaningless exercise.
Security Maturity
Which Assessment Matches Your Current Posture
Here's a simple framework we use internally to recommend the right engagement type:
Level 1 — Foundational: You have basic security controls (firewalls, antivirus, patching) but haven't done formal security testing. Start with: Vulnerability assessment + focused penetration test on your highest-risk assets.
Level 2 — Developing: You've done pen tests, remediated critical findings, and have some detection capability (SIEM, MDR, or internal SOC). Start with: Comprehensive penetration test across all attack surfaces. Consider an assumed-breach exercise.
Level 3 — Established: You have a mature security program with detection, response playbooks, and have remediated pen test findings to a manageable baseline. Start with: Purple team engagement or tabletop red team exercise.
Level 4 — Advanced: You have a dedicated security team, established detection engineering practice, and incident response has been tested multiple times. Start with: Full red team engagement with specific objectives (e.g., can an attacker reach the crown jewels?).
Most companies that contact us are at Level 1 or 2. That's not a criticism — it's the reality of where most organizations are. The problem is when a Level 1 company buys a Level 4 service because someone on the executive team read a LinkedIn post about red teaming.
The Best of Both Worlds
Why Purple Teaming Is Often the Smartest Investment
Purple teaming combines offensive and defensive testing in a collaborative framework. Instead of the red team operating in secret and delivering a report at the end, the red team executes attack techniques in coordination with the blue team (defenders), who attempt to detect and respond in real time.
After each technique, both teams debrief: Did the SOC detect it? If yes, how quickly and through which data source? If not, what detection rule or data source would be needed? This iterative process builds defensive capability directly during the engagement rather than months after a red team report is delivered.
We've found that a 2-week purple team engagement typically improves detection coverage by 40-60% across the MITRE ATT&CK framework techniques tested. A comparable red team engagement delivers a report that often sits in a backlog for months before detections are built.
When to choose purple over red: If your primary goal is to improve your detection and response capabilities (not just test them), purple teaming delivers more value. Red teaming is appropriate when you need a realistic, unbiased assessment of whether your existing defenses would stop a motivated adversary — but only if those defenses actually exist first.
Avoid These Traps
Five Mistakes We See Repeatedly
1. Buying a red team engagement as your first security assessment. You'll get a devastating report and no foundation to address the findings. Start with a pen test.
2. Telling the SOC about the red team. If the defenders know they're being tested, they operate on high alert. The results won't reflect your real-world detection posture. The entire point is that they don't know.
3. Scoping a pen test too narrowly. Testing only your web application while ignoring your cloud infrastructure, internal network, and email security gives you a false sense of confidence. Attackers don't respect scope boundaries.
4. Choosing a vendor based on the cheapest bid. A $5,000 penetration test for a complex SaaS platform is not a penetration test — it's an automated scan with a PDF wrapper. If the price seems too good to be true, you're buying a vulnerability scan dressed up as expert analysis.
5. Not retesting after remediation. You paid to find vulnerabilities. You spent engineering time fixing them. And then you never verified that the fixes actually work. Always budget for a retest.
Not Sure Which Assessment You Need?
We'll evaluate your current security posture and recommend the assessment type that will deliver the most value for your specific situation and budget. No upselling — we'd rather do the right engagement than the expensive one.
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Alexander Sverdlov
Founder of Pentestas. Author of 2 information security books, cybersecurity speaker at the largest cybersecurity conferences in Asia and a United Nations conference panelist. Former Microsoft security consulting team member, external cybersecurity consultant at the Emirates Nuclear Energy Corporation.