Network Security Assessments
Network Security Assessments
Find Every Attack Path Through Your Infrastructure
Network penetration testing simulates real-world attacker movement through your infrastructure — from initial external access through internal lateral movement to domain compromise. SIRI Law LLP’s network security team conducts both external and internal network assessments, providing a clear picture of how a determined attacker could move through your environment.
Overview
Network Security Assessments: Technical Depth Meets Legal Oversight
Most organisations have a reasonably well-defended perimeter — but their internal network tells a different story. Once an attacker gains initial access (through a phishing email, an exposed service, or a compromised credential), what they find inside determines the blast radius of the incident.
SIRI Law LLP’s network assessments are conducted from an attacker’s perspective — we identify not just individual vulnerabilities but the complete kill chain: initial access → lateral movement → privilege escalation → objective. This gives you a realistic picture of your actual risk exposure.
We assess both external (internet-facing) infrastructure and internal networks — including Active Directory environments, which remain the most common path to domain compromise in modern network attacks.
AI-Assisted Attack Path Analysis
We use AI-assisted tools to map complex network environments and identify non-obvious attack paths — supplementing manual analysis with algorithmic pattern recognition across large infrastructure footprints.
For OT/ICS environments, we bring specialist knowledge of industrial protocol security and the unique challenges of assessing operational technology without disrupting production systems.
Services Offered
What We Handle
- External network penetration test — internet-facing assets and perimeter
- Internal network penetration test — assume-breach lateral movement
- Active Directory attack path analysis — Kerberoasting, Pass-the-Hash, DCSync
- Azure Active Directory / Entra ID security assessment
- Wireless network security assessment — WPA enterprise, guest segmentation
- Firewall and ACL rule review and optimisation advisory
- VPN and remote access security assessment
- Network device configuration audit — routers, switches, firewalls
- VLAN segmentation validation — inter-VLAN attack path testing
- DNS security assessment — zone transfer, cache poisoning, DNSSEC
- OT/ICS network security assessment — Modbus, DNP3, Profinet
- Zero-trust architecture assessment and gap analysis
- Network traffic analysis — cleartext credential detection
- Decommissioned device and legacy protocol identification
Client Benefits
Why Clients Choose SIRI Law LLP
Kill-Chain Focused
We don’t just list vulnerabilities — we demonstrate complete attack paths from initial access to objective, showing real business impact.
Active Directory Specialists
Active Directory is the most common path to full domain compromise. Our team specialises in AD attack paths and has assessed hundreds of environments.
OT/ICS Experience
We assess operational technology networks with the specialist knowledge required to test without disrupting production — understanding both IT and OT security requirements.
Remediation Prioritisation
Findings are prioritised by business impact and exploitability — not just CVSS score — so your team focuses effort where it matters most.
Representative Matters
Typical Engagements
All matters described generically to protect client confidentiality.
External Penetration Test – Financial Services
Identified an externally exposed legacy web application with Remote Code Execution — providing a direct path into the internal network. Critical finding remediated within 48 hours of delivery.
Internal Network Assessment – Healthcare
Demonstrated a complete attack path from network access to full Active Directory domain compromise in under 4 hours — exposing patient records and clinical systems. Root cause: misconfigured service account with excessive privileges.
Wireless Security Assessment
Identified an unsegmented guest wireless network providing direct access to the corporate VLAN — enabling an attacker with physical access to the building to reach internal systems.
OT/ICS Assessment – Manufacturing
Assessed the OT network of a manufacturing facility — identifying cleartext Modbus communications, direct internet connectivity to SCADA systems, and IT/OT network bridging that violated segmentation policy.
What to Expect
Client Outcomes
Complete Kill-Chain Report
Not just a list of vulnerabilities — a narrative of the complete attack path from initial access to objective, written for both technical and executive audiences.
Detection & Response Insights
We document which phases of the attack we were detected in (if any) — giving your SOC team actionable feedback on detection capability gaps.
Complimentary Retest
Critical and high findings are retested after remediation to confirm genuine closure — included in every engagement.
Frequently Asked Questions
What is the difference between an external and internal network penetration test?
An external penetration test simulates an attacker with no prior access to your environment — testing internet-facing systems for vulnerabilities that could enable initial access. An internal penetration test simulates an attacker who has already gained some level of access (through phishing, a compromised employee device, or physical access) — testing what damage they can do from inside your network. Both are valuable and address different threat scenarios.
How long does a network penetration test take?
A standard external network penetration test typically takes 5–8 business days. An internal network assessment with Active Directory scope takes 8–15 business days depending on environment complexity. We provide a precise timeline after scoping.
Should we fix vulnerabilities before a penetration test?
No — address critical known vulnerabilities first if you have them, but do not delay testing while remediating everything. Penetration tests are most valuable when they test your real environment, not a hardened test environment. Post-engagement, you remediate based on findings.
Ready to Strengthen Your Security Posture?
We begin every engagement with a scoping call — no commitment required.
Also see: All Cybersecurity Services · Compliance & GRC