Pentesting Internal IT Infrastructure
An internal penetration test at Exfilion answers the question that matters after any initial compromise: How far can an attacker actually get once they already have access to the internal network?
We assess your environment from the perspective of an attacker with network access. That may be a compromised client, a stolen VPN account, an unprivileged user account, or an insider scenario. What matters is not the initial foothold itself, but what can be built from it.
Depending on the objective, we begin either as a black-box scenario without credentials or with an unprivileged user account. In the black-box case, we examine which attack surfaces are exposed inside the network even without known credentials. With a standard employee account, we additionally assess typical permissions, restrictions, and whether they can be leveraged for lateral movement or privilege escalation.
If required, the assessment can be extended with a physical security assessment. This allows us to evaluate whether physical weaknesses provide a path into sensitive areas or directly into the internal network. In real attack scenarios, physical access is often the starting point for broader compromise.
The core of the engagement is the systematic analysis of internal attack surfaces. Typical targets include Active Directory and identity environments, internal services such as SMB, RDP, FTP, and databases, internal web applications and APIs, network segmentation, firewall and ACL rules, wireless infrastructure, and IoT or OT components.
The real depth comes from manual analysis. We do not treat weaknesses as isolated findings. Instead, we combine vulnerabilities, misconfigurations, and trust relationships into realistic attack paths. Particular focus is placed on credential exposure, privilege escalation, insecure delegations, misconfigurations in AD, DNS, SMB, LDAP, or Kerberos, and lateral movement across systems and segments.
Where viable attack paths exist, we validate them in a controlled manner within the agreed scope. The goal is not to maximize the number of findings, but to answer the questions that matter operationally: Can privileged access be obtained, can critical systems be reached, and can sensitive data be compromised?
Our methodology is informed by established standards such as the OWASP Testing Guide, OSSTMM, and the Penetration Testing Execution Standard (PTES). These serve strictly as a baseline. The real depth comes from our practical, offensive approach, focused on real-world attack techniques and actual compromise scenarios rather than formal compliance.
The outcome is not an abstract risk assessment, but a clear statement: Which internal attack paths exist and how far an attacker can actually get.
Competence
Exfilion testers deliver proven offensive capability, not theory. Our team consists of experienced hacking experts with hands-on certifications such as
OSCP (Offensive Security Certified Professional),
CRTO (Certified Red Team Operator), and
BACPP (Binsec Academy Certified Pentest Professional).
Together, the Exfilion team combines decades of experience in offensive assessments, red teaming, and deep technical analysis. This experience was built under real-world conditions and not in lab environments.
Pentest Guidelines
Standards are the baseline. Exfilion goes far beyond.
Standards and regulatory frameworks define the minimum. They outline what should be tested, but not how far a real attack can go. They provide structure, but not security.
Many assessments stop where requirements are fulfilled. Checklists are completed and controls are marked as compliant. This is where blind spots emerge, because real attackers do not follow standards, they follow opportunities.
Exfilion uses standards as a starting point, not a boundary. Through experience, technical depth, and creative offensive approaches, we go beyond them to uncover vulnerabilities that remain invisible in conventional assessments.
Your provider for Internal pentest
Exfilion stands for deep technical, manual penetration testing at elite level with a clear focus on real attack paths. We do not operate by checklist and not in the style of traditional pentest providers. Our objective is to realistically compromise systems and expose their true attack surface under real conditions. Exfilion is the specialized provider in Germany for Internal penetration test at elite level.
