INTERNAL NETWORK PENETRATION TESTING
Internal network penetration testing: find out how far an inside attacker gets
Assume-breach testing run by pentesters certified in OSCP and OSEP. We simulate an attacker with network access and trace the path to the domain controller and critical data.
WHY IT MATTERS
The perimeter will fall one day. What matters is what the attacker does next
Phishing, a stolen password or an infected laptop will sooner or later give an attacker a foothold in the network. The question is not “if” but “how far they get from there”. An internal network test answers it concretely.
In one test: starting from a single ordinary workstation, we reached domain administrator privileges in a few steps by abusing service and delegation misconfigurations. From a single employee’s level, an attacker would take over the whole network.
WHAT WE CHECK
The path from one workstation to the whole domain
We work assume-breach, starting from the level of ordinary network access.
OUR APPROACH
We start where phishing ends
We assume the attacker already has a foothold, because in the real world they will eventually get one. Our goal is to show how far they get from there and which misconfigurations enable it, step by step with evidence.
We work to PTES and map activity to MITRE ATT&CK, so the report is not a list of isolated flaws but a description of a real attack path and the specific points where you can break it.
COMPLIANCE
A test of your network’s internal resilience
Internal network testing confirms that a single compromise does not mean losing the whole organization.
STANDARDS & CERTIFICATIONS
We work to recognized methodologies, not gut feeling
Every project is run by certified pentesters and based on public standards. That makes the result repeatable, auditable and comparable across vendors.
We share the full list of certifications and standards on request, together with a sample test scope.
HOW WE DO IT
A repeatable process based on PTES
EVIDENCE
Numbers behind every promise
Every test is run by certified pentesters, and we document the result with reproduction steps, evidence and a verified remediation path. Proof, not a promise.
KNOWLEDGE
Internal network penetration testing in practice
Why the internal network needs its own test
An internal network test assumes the attacker is already inside, for example after a successful phishing attack or via an infected device. It checks how far they get once they are behind the first line of defense.
It is a different perspective from an external test, because inside, segmentation, permissions and lateral movement are what matter. Many companies protect the perimeter well but have a flat network inside, where a single compromised account opens almost everything.
What we check in an internal test
We map the reachable systems, services and accounts, then look for escalation paths leading to key assets and domain control. We check whether segmentation really limits movement or exists only on a diagram.
We test the typical weaknesses of Windows and Active Directory environments, shared credentials and poorly secured internal services. These are exactly the elements that most often turn a minor incident into a takeover of the whole network.
Why lateral movement is the heart of the attack
Real damage rarely comes from the first compromised computer, but from how freely the attacker moves on from there. If one workstation leads to servers and administrative accounts, a single flaw becomes a catastrophe.
So we focus on limiting the reach of the attack, not just the number of vulnerabilities. We show which barriers really stop an attacker and which they pass without effort.
What you get and when to test
The report describes specific attack paths inside the network, with evidence, a risk rating and remediation priorities. We point out the changes that most reduce the reach of a potential breach, such as segmentation and order in permissions.
An internal network test is worth running periodically and after major infrastructure changes, migrations or acquisitions. It is one of the best ways to check what happens after an attacker crosses the first barrier.
FAQ
Common questions
What does assume-breach mean?
On-site or remote?
Do you focus on Active Directory?
Is the retest included?
RELATED
Related reading
CASE STUDIES
Case studies in this area
REFERENCES
“The project was delivered professionally and on time, with a strong grasp of both technology and business. We were impressed by their cybersecurity expertise and partnership approach.”
