What Penetration Testing Services Actually Deliver
A penetration test is a controlled, authorized attempt to exploit weaknesses in your environment using the same techniques, tools, and tradecraft real threat actors use. Unlike automated vulnerability scanners, penetration testing requires human judgment to chain vulnerabilities into realistic attack scenarios, assess business impact, and validate that your defenses hold under pressure.
Armorstack’s SENTRY penetration testing team operates under the Penetration Testing Execution Standard (PTES) and NIST SP 800-115, ensuring every engagement follows a repeatable, auditable methodology. Our 100+ technical experts bring current threat intelligence — mapped to MITRE ATT&CK — into every assessment, so findings reflect what sophisticated threat actors are actually doing, not just what a compliance checklist requires.
For regulated industries, penetration testing is rarely optional. Healthcare organizations face HIPAA Security Rule requirements to assess technical safeguards. Defense contractors must satisfy CMMC 2.0 assessment objectives. Financial institutions respond to GLBA Safeguards Rule expectations. Manufacturers protecting operational technology face NIST SP 800-82 guidance. Armorstack delivers testing that satisfies these requirements while generating intelligence your security team can act on immediately.
The SENTRY Penetration Testing Methodology
Every engagement follows a structured six-phase process aligned to PTES and NIST SP 800-115.
Scoping & Rules of Engagement
We define what systems are in scope, what testing windows are acceptable, what constitutes a finding, and how critical discoveries are escalated — giving testers the authority to work without ambiguity.
Reconnaissance & Intelligence Gathering
Passive and active reconnaissance builds an attacker’s-eye view of your environment — exposed services, technology stack, and public intelligence — mapping directly to MITRE ATT&CK’s Reconnaissance tactic.
Threat Modeling & Vulnerability Analysis
Testers identify candidate vulnerabilities across the attack surface using automated tools and manual analysis, prioritized by exploitability and business impact before exploitation is attempted.
Exploitation
Controlled exploitation confirms whether vulnerabilities are genuinely exploitable in your specific environment — the point where testing separates from vulnerability scanning.
Post-Exploitation & Lateral Movement
After initial access, testers assess how far an attacker can move, what data they can reach, and how long they can persist without detection — the actual blast radius, not just the entry point.
Reporting & Remediation Guidance
Every engagement produces an executive report for leadership and a technical report with reproducible proof-of-concept steps, CVSS scores, and specific remediation guidance.
Penetration Testing Service Lines Under SENTRY
Armorstack’s penetration testing practice covers the full attack surface of a modern regulated organization. Each service line is explored in detail across our SENTRY cluster.
Network Penetration Testing
External and internal assessments identify exploitable paths through perimeter defenses, misconfigured firewall rules, and Active Directory attack paths.Learn more →
Web Application Penetration Testing
OWASP Testing Guide–aligned assessments targeting injection flaws, authentication weaknesses, access control failures, and business logic errors automated scanners miss.Learn more →
OT & ICS Penetration Testing for Manufacturers
Specialized NIST SP 800-82–aligned methodology that validates real attack paths at the IT/OT convergence point without disrupting production systems.Learn more →
Penetration Testing for CMMC Compliance
Testing aligned to NIST SP 800-171 assessment objectives that generates the documentation your C3PAO assessor expects to see.Learn more →
Understanding Penetration Testing Types
Black-box, gray-box, and white-box engagements serve different objectives — choosing the right format for your risk profile and compliance obligations.Learn more →
Pen Test vs. Vulnerability Scan
These assessments are frequently confused and sometimes misrepresented as equivalent. Here’s when each is appropriate and why regulated industries typically need both.Learn more →
Red Team vs. Pen Test
Penetration tests maximize vulnerability discovery within defined scope. Red team operations simulate a full adversary campaign to test detection and response.Learn more →
Penetration Testing Cost
Market ranges, cost drivers, and how to evaluate proposals — so you can distinguish credible engagements from underpriced assessments.Learn more →
How Penetration Testing Integrates With the SENTRY Practice
Penetration testing is a point-in-time assessment. It tells you where you were vulnerable on the day of the engagement. For regulated organizations facing persistent, adaptive threats, that point-in-time picture needs a continuous monitoring layer — and a governance layer — to stay meaningful.
Managed Detection & Response
MDR telemetry monitors for exploitation attempts targeting the same attack vectors identified during testing, and confirms remediation is functioning as expected once implemented.Learn more →
VERITY Risk Advisory
For risk acceptance decisions, remediation prioritization, and board reporting, VERITY translates a penetration test finding into a risk position your leadership can act on.Learn more →
Who Should Conduct Your Penetration Test
Not all penetration testing providers deliver equivalent results. The critical differentiators are methodology rigor, tester expertise, and reporting quality. Armorstack evaluates providers — including for organizations that need to procure testing through third parties — on these criteria:
- Documented alignment to PTES, NIST SP 800-115, or the OWASP Testing Guide
- A manual testing component — not solely automated scanning repackaged as a penetration test
- Tester credentials (OSCP, GPEN, GWAPT, CREST) and demonstrable domain expertise
- Executive and technical report samples showing actionable, specific findings
- Rules of engagement documentation and defined escalation procedures for critical findings
- Post-engagement support for remediation validation
Armorstack’s SENTRY team meets all of these criteria and adds the context of 100+ technical experts across security operations, compliance, and architecture — so penetration test findings connect directly to remediation resources and continuous monitoring capability.
Penetration Testing by Compliance Framework
Frequently Asked Questions
What is penetration testing and how does it differ from a vulnerability scan?
A penetration test is a controlled, authorized attempt to exploit vulnerabilities using the same techniques real attackers use. A vulnerability scan identifies potential weaknesses automatically but does not confirm whether they are exploitable. Penetration testing requires human expertise to chain vulnerabilities into realistic attack paths and assess actual business impact.
How often should regulated organizations conduct penetration testing?
Most compliance frameworks require annual penetration testing at a minimum. PCI-DSS v4.0 Requirement 11.4 mandates annual external and internal testing. HIPAA Security Rule technical evaluation requirements are satisfied by annual penetration testing. CMMC 2.0 requires testing before third-party assessment. Organizations should also test after significant infrastructure or application changes.
What methodology does Armorstack use for penetration testing?
Armorstack’s SENTRY practice follows the Penetration Testing Execution Standard (PTES) and NIST SP 800-115. Findings are mapped to MITRE ATT&CK tactics and techniques. OT and ICS engagements additionally reference NIST SP 800-82. Web application testing follows the OWASP Testing Guide.
Does Armorstack offer penetration testing for OT and manufacturing environments?
Yes. Armorstack’s SENTRY team provides OT and ICS penetration testing aligned to NIST SP 800-82 guidance. These engagements are scoped carefully to avoid disrupting production systems while still validating real attack paths at the IT/OT convergence boundary — the most common entry point for attacks on manufacturing environments.
Can penetration testing satisfy CMMC 2.0 requirements?
Penetration testing aligned to NIST SP 800-171 assessment objectives supports CMMC 2.0 compliance by validating that technical controls function as documented. Armorstack’s CMMC penetration testing generates the documentation C3PAO assessors expect and identifies gaps before a formal assessment, reducing the risk of findings during certification.
Start Your Penetration Testing Program
Ready to Validate Your Defenses?
Armorstack’s 90-Day Proof is built for organizations that need to establish or validate their security posture within a defined timeframe — a compliance deadline, a board request, or a change in risk environment. Penetration testing is a core component of that engagement. To scope your own engagement, talk to a SENTRY expert: we’ll ask about your environment, compliance obligations, testing history, and remediation capacity so scope matches your actual risk priorities, not a default template.