Introduction
Penetration testing — often called "ethical hacking" — is the practice of simulating real-world cyberattacks against your systems to identify vulnerabilities before attackers can exploit them. Unlike vulnerability scanning, which identifies potential issues, penetration testing actively attempts to exploit those issues to demonstrate real business risk.
For organizations subject to compliance frameworks like PCI DSS, HIPAA, or SOC 2, penetration testing is not optional — it is required. For everyone else, it is one of the most effective investments you can make in your security posture.
The Five Phases of Penetration Testing
Phase 1: Reconnaissance
Also called "information gathering," this phase involves collecting as much data about the target as possible.
- Passive recon: OSINT techniques — DNS records, Shodan, social media, Google dorking, job postings
- Active recon: Port scanning, service enumeration, network mapping
Goal: Build a detailed profile of the target's attack surface.
Phase 2: Scanning and Enumeration
This phase identifies live systems, open ports, running services, and potential entry points.
- Network scanning (Nmap, Masscan)
- Vulnerability scanning (Nessus, OpenVAS)
- Web application enumeration (directory busting, parameter discovery)
- Service-specific probing (SMB, SSH, SQL, RDP)
Goal: Identify exploitable vulnerabilities and potential attack vectors.
Phase 3: Exploitation
This is where the tester actively attempts to breach the target.
- Exploiting known vulnerabilities (CVEs)
- Password attacks (brute force, spraying, credential stuffing)
- Web application attacks (SQL injection, XSS, CSRF)
- Social engineering (phishing, pretexting)
- Physical security bypasses
Goal: Gain unauthorized access to demonstrate impact.
Phase 4: Privilege Escalation and Lateral Movement
Once inside, the tester attempts to move deeper into the network.
- Escalating from user to administrator/root
- Dumping password hashes and credentials
- Moving laterally to other systems
- Pivoting through the network to reach sensitive assets
Goal: Demonstrate the maximum potential damage an attacker could achieve.
Phase 5: Reporting and Remediation
The most important phase. The tester documents findings in a clear, actionable report.
- Executive summary (business impact, risk ratings)
- Technical findings (vulnerability details, exploitation steps)
- Remediation recommendations (prioritized by risk)
- Retesting (verifying fixes are effective)
Goal: Provide the organization with a roadmap to improve security.
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Get StartedTypes of Penetration Testing
By Knowledge Level
| Type | What the Tester Knows | Pros | Cons |
|---|---|---|---|
| Black Box | Nothing (like a real attacker) | Most realistic, tests detection and response | Time-consuming, may miss deep vulnerabilities |
| White Box | Full access (source code, credentials, network maps) | Most thorough, finds hidden issues | Less realistic |
| Gray Box | Partial knowledge (user-level access) | Balanced approach | Moderate coverage |
By Scope
| Type | Focus | Frequency | Cost |
|---|---|---|---|
| Network Pen Test | External and internal network infrastructure | Annually or after major changes | $$$ |
| Web Application | Web apps, APIs, microservices | Per release or quarterly | $$ |
| Mobile Application | iOS and Android apps | Per major release | $$ |
| Cloud Pen Test | AWS, Azure, GCP configurations | Annually | $$$ |
| Physical | Building access, security controls | Annually | $$ |
| Social Engineering | Phishing, pretexting, tailgating | Quarterly | $ |
| Wireless | Wi-Fi, Bluetooth, RFID | Annually | $ |
| Red Team | Full-scope simulation (network + physical + human) | Annually | $$$$$ |
Cost legend: $ = Budget ($1K-$3K) | $$ = Low ($3K-$8K) | $$$ = Moderate ($8K-$20K) | $$$$ = High ($20K-$50K) | $$$$$ = Premium ($50K-$150K+)
Compliance Requirements
| Framework | Pen Testing Requirement |
|---|---|
| PCI DSS v4.0 | Required every 12 months and after significant changes |
| HIPAA | Required as part of risk analysis (no fixed frequency) |
| SOC 2 | Typically required every 6-12 months |
| ISO 27001 | Required periodically (based on risk assessment) |
| NIST 800-53 | Required as part of security assessment |
| FedRAMP | Required annually for cloud services |
Vulnerability Scanning vs. Penetration Testing
Many organizations confuse these two activities:
| Aspect | Vulnerability Scanning | Penetration Testing |
|---|---|---|
| What it does | Identifies potential vulnerabilities | Exploits vulnerabilities to demonstrate risk |
| Automation | Highly automated | Largely manual with automated tools |
| False Positives | Common | Minimal (exploitation confirms the finding) |
| Business Impact | Technical report | Business-focused risk assessment |
| Cost | Low ($500-$5K) | Higher ($5K-$50K+) |
| Frequency | Weekly to monthly | Annually or quarterly |
Run vulnerability scans weekly, but conduct penetration tests annually or before major changes. Scans find issues; pen tests prioritize them by demonstrating real risk.
What to Look for in a Penetration Testing Partner
| Criterion | Why It Matters |
|---|---|
| Relevant certifications | CREST, OSCP, GPEN, CISSP indicate competence |
| Industry experience | Healthcare pen testing differs from financial services |
| Clear reporting | Reports should include both executive and technical sections |
| Remediation support | The best partners help you fix findings, not just find them |
| Retesting policy | Verify fixes are effective within the engagement |
The SLAMM Approach
At SLAMM, our penetration testing methodology follows industry best practices (OWASP, PTES, NIST SP 800-115) while emphasizing:
- Real-world attacker simulation — we test the way real adversaries operate
- Business impact focus — findings are ranked by actual business risk, not CVSS scores alone
- Clear, actionable reporting — both executive summaries and technical deep-dives
- Remediation guidance — we help your team fix vulnerabilities, not just point them out
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