Internal Network Penetration Testing

Internal Network Penetration Testing Australia

Assume breach. Secure Crown Jewels.

Senior-led internal network penetration testing for Australian organisations. We simulate determined adversaries and insider threats to identify flat networks, excessive Active Directory privileges, and pathways to complete domain compromise.

Engagements starting from A$8,500 ex GST
View Pricing & Scope See Attack Paths
The Hard Shell, Soft Center Paradox

A flat internal network is a ransomware operator's dream.

Modern security demands an "assume breach" mentality. Whether it's a compromised employee endpoint, a malicious insider, or a successful phishing campaign, threat actors will eventually bypass your external perimeter.

The question is: what happens next? If a single compromised laptop allows an attacker to harvest credentials, pivot across flat subnets, and gain Domain Admin access, your entire business is at risk. We map these exact attack paths before real adversaries can exploit them.

What We Test

Our rigorous active enumeration targets:

  • Active Directory attack paths
  • Excessive privileges & local admin reuse
  • Kerberoasting & AS-REP roasting
  • Insecure delegation & GPO/ACL abuse
  • Exposed file shares and secrets
  • Lateral movement (SMB, RDP, WinRM)
  • Network segmentation weaknesses
  • Backup/admin console exposure
Real-World Scenarios

Example Attack Paths We Validate

We don't just run scans. We manually chain low-severity findings together to demonstrate critical impact on your business operations.

Standard User → Kerberoastable Service Account → Local Admin Reuse → Domain Compromise Pathway
Compromised Workstation → Exposed File Share → Admin Script Credentials → Sensitive Data Access
Flat Network Segment → Management Interface Exposure → Backup Console Access → Crown-Jewel Ransomware Impact
Rigorous Validation

Our 6-Phase Internal Adversary Methodology

We operate exactly like a modern ransomware affiliate or targeted threat actor. We plug into your network with zero starting privileges and systematically map the path to domain dominance.

01
Network Mapping
Thorough active enumeration to discover live endpoints, hidden subnets, legacy servers, and misconfigured file shares available to unauthenticated users.
02
Active Directory Recon
Deep structural mapping using BloodHound to identify complex trust relationships, toxic permissions, and hidden attack paths leading to Tier 0 assets.
03
Privilege Escalation
Exploiting misconfigurations (Kerberoasting, AS-REP Roasting, local admin reuse) to elevate privileges from a standard domain user to a highly privileged account.
04
Lateral Movement
Simulating the spread of a targeted attack across your internal network to demonstrate how easily a threat actor can traverse segmented VLANs.
05
Objective Execution
Demonstrating access to your Crown Jewels—whether that means databases, financial systems, or obtaining full Domain Administrator control.
06
Strategic Reporting
Delivering an executive summary, prioritised technical remediation guidance to break the attack paths, and the formal Certificate of Penetration Testing.
Comprehensive Output

Deliverables & Evidence

You receive more than a list of vulnerabilities. We provide actionable intelligence required for both technical remediation and board-level reporting.

Executive Summary
Detailed Technical Findings
Visual Attack-Path Diagrams
Proof-of-Concept Evidence Screenshots
Prioritised Remediation Roadmap
Active Directory Risk Themes
Certificate of Penetration Testing
Executive Debrief & Optional Retest

How It Compares

Understanding the boundaries between assurance services.

Capability Internal Pentest External Pentest Vulnerability Scan Red Team
Perspective Assume Breach (Inside) Internet-Facing Automated Discovery Full Spectrum (Phishing/Physical)
Active Directory Exploitation ✓ Yes ✗ No ✗ No ✓ Yes
Manual Attack Path Chaining ✓ Yes ✓ Yes ✗ No ✓ Yes
Evasion Techniques Used? ✗ No (Noisy) ✗ No (Noisy) ✗ No ✓ Yes (Stealth)
Frictionless Procurement

Transparent Pricing & Scope

Internal Network Engagement
Comprehensive manual and automated testing for your internal corporate network.
From A$8,500 ex GST
Fixed-fee pricing available for clearly defined scopes. Larger or denser environments are priced based on endpoint counts, Active Directory complexity, and required validation depth.
Proceed with Engagement

Frequently Asked Questions

What is an internal network penetration test?
An internal network penetration test is a controlled, ethical hacking engagement targeting your internal corporate network. Unlike an external test, we operate with an "assume breach" mentality. We connect directly to your local area network (or internal VPN) to simulate an insider threat or a compromised employee endpoint, actively seeking ways to escalate privileges and access your Crown Jewels.
Do you test our Active Directory environment?
Yes. Active Directory exploitation is a core component of our methodology. We systematically map your AD structure using tools like BloodHound to uncover toxic permission chains, kerberoasting vulnerabilities, and complex trust relationships that would allow an attacker to escalate from a standard user to Domain Administrator.
How much does an internal network penetration test cost in Australia?
At Lean Security, we provide transparent pricing starting from A$8,500 ex GST. Fixed-fee pricing is available for clearly defined scopes. Larger or highly complex internal networks are priced based on the number of endpoints, server instances, Active Directory density, and required validation depth.
Does internal penetration testing satisfy ISO 27001, PCI DSS or APRA CPS 234 requirements?
Internal penetration testing can support ISO 27001, PCI DSS and APRA CPS 234 audit evidence when scoped against the relevant systems and control objectives. It should be treated as part of a broader assurance programme, not a standalone compliance guarantee.

Stop internal lateral movement.

Identify missing segmentation, vulnerable Active Directory paths, and hidden network flaws before a compromised endpoint turns into a total domain takeover.

Book Your Internal Pentest