Internal Penetration Testing Services
Know your unknowns through our internal network penetration testing service to assess, and quantify the internal infrastructure security vulnerabilities across corporate or production internal networks. It helps you to prepare a risk mitigation approach meant to reduce the attack surface and improve internal security posture – the most critical component of a corporate cyber security strategy.
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Protect Your Internal Network with Professional Internal Network Penetration Testing Services
Insider threats are one of the most overlooked risks in modern cyber security. A single compromised device, a misconfigured server, or an employee with excessive privileges can give an attacker unrestricted access to your entire internal infrastructure.
Our internal network penetration testing service simulates a real-world attacker operating from inside your network perimeter. Our certified ethical hackers conduct authorised, structured assessments across your Active Directory environment, internal servers, workstations, switches, and routers.
At the end of the engagement, you receive a detailed report written in plain English. Our testing also supports compliance with Cyber Essentials Plus, ISO 27001, and PCI DSS requirements.
How do we conduct internal network penetration test?
Our internal penetration testers work with you to define the assets in scope covering primary security concerns and any regulatory requirements.
Specific internal pentests defined against certain targets are defined under ‘white box’, ‘black box’ or ‘grey box’ testing methodologies to define internal penetration test cases before starting the assessment.
Reconnaissance phase works with the single objective – information gathering and analysis to provide relevant information for later stages.
Based on project scope, intelligence gathering is mostly infrastructure related (e.g., network layouts, domains, servers, infrastructure details) unless it is a red team pentesting where personnel are in scope.
Using manual approaches and internal penetration testing tools, our cyber security experts identify security weaknesses through actively scanning, attempst to bypass intrusion detection systems, intrusion prevention systems and prepare an attack layout to target vulnerable systems (security cameras, computer systems, network equipment related to network traffic, enterprise web apps, etc) . It includes identifying open ports using automated scans, services, identifying relevant network interface web application and any exploitable security weaknesses.
Initial access is gained by exploiting weaknesses identified in the previous discovery phase. Privilege escalation attempts and lateral movement actions are carried out to infiltrate and gain proper access into the network(s).
Further internal vulnerabilities are exploited in a safe manner to measure the extent of exploitation, leading up to domain administrator account compromise.
This includes analysis on the pen test output, evaluation of the risk impact and attack likelihood before providing action plans to remediate the identified risks.
All our reports address business as well as the technical audience with supporting raw data, including mitigation measures at strategic and tactical levels to help the customer security teams.
Our engagement process includes delivering a free of charge debrief to management and technical teams. This session involves helping to prepare a remediation plan based on the identified vulnerabilities and Q&A to ensure that customer contacts are up to date. Cyphere provides a remediation consultancy where we define and execute the risk mitigation plan.
Vulnerabilities discovered during internal penetration testing
- Active directory vulnerabilities such as group policy security misconfiguration and authentication/authorisation issues
- Insecure logging and monitoring
- Network segmentation
- Patch management
- Password controls
- Insecure information storage practices
- Abusing ACLs/ACEs
- Constrained delegation
- Kerberoasting
- AS-REP Roasting
- Abuse DnsAdmins
- Passwords in AD User comments
- Password Spraying
- DCSync
- Silver Ticket
- Golden Ticket
- Pass-the-Hash
- Pass-the-Ticket
- Missing SMB Signing
- ZeroLogon
FAQs about Internal Network Penetration Testing Services
Internal and external penetration testing exercises are discussed separately due to the threat profiles associated with Internet-facing (external) and inside environments (internal).
An internal network security test, the same as an internal penetration test, is aimed at the internal network from an insider attacker perspective, i.e. an employee, contractor or partner. Internal penetration tests uncover vulnerabilities by exploiting weaknesses in internal security controls, revealing unauthorized internal access is gained to sensitive resources.
External pen testing is aimed at external network i.e. internet-exposed IPs and/or systems only simulating a threat actor on the internet (unauthenticated). External network penetration test measures your internet-facing assets i.e. external network attack surface (external tests) and will never tell you the real story of your internal security culture.
Internal pen tests and external penetration tests should be performed once annually to check network equipment, perimeter security controls and other database controls. Other asset categories include cloud penetration testing, wireless penetration testing and application and APIs.
Internal penetration tests can be scoped based on the requirements and threats related to the target system or network. For instance, if an organisation has never opted for network-wide assessment and is aiming to improve security, it makes business sense to assess the gaps for the entire estate and perform risk remediation to set internal benchmarks. If an organisation holds maturity in its security processes, targeted assignments are scoped such as network segmentation, specific internal security testing projects. See different types of penetration testing article for more details.
A thorough internal pen testing measures the information security culture at ground level. This includes password security (cracking & analysis), patching audit, group policy security, active directory design and architecture risks, insecure device and web application interfaces, encryption configuration, authentication, authorisation, secure information storage practices and network device hardening. Some prospects confuse this with vulnerability assessment, which is not because internal pen test includes exploitation of weaknesses. See this blog on the difference between the two. Don’t mistake this with red teaming, read a detailed article on this topic here.
Internal pen test in an internal environment involves considering threat scenarios based on the architecture and external threats. For instance, a company’s internal layout could be segmented with corporate, staging, production environments. For a medium-size company, it may be all in one and their production environment may be just a website hosted at a third-party site. Therefore, carrying out black-box penetration tests is justified in this scenario to assess the extent of an attack and it would mimic a complete outsider in your environment.
For the insider attack simulation test, we will ask standard staff privileges and start our internal network assessment from there to figure out various ways with the objective of compromising underlying workstations/laptops and then infiltrating servers and domain controllers.
Where multiple physical sites and network segregations are a challenge remotely, onsite assessment is preferred. With post covid19 measures, we utilise a number of methods (SSL VPN, VM deployment or shipping hardware to client site) to carry out remote penetration testing of internal networks.
Communication plays an important role during security assessments. We explicitly request a list of fragile components during proposal and project initiation meetings. Low-level attacks such as man-in-the-middle attacks, Denial of Service attacks are explicitly deemed out of scope for all assessments. This ensures the client that the pen testing methodology includes careful assessment in line with business assets and not a blind scanning approach.
Cyphere’s internal pen testing reports are world class deliverables containing raw data to support proof of concept and risk remediation measures.
Risk remediation is sometimes a complex process due to the specialist security skill-set needed for IT teams. As part of our aftercare support, we provide help in preparing remediation plans for all our customers.
Optionally, we provide remediation consultancy services with an internal penetration test to ensure all agreed findings are mitigated in line with best network security practices.
Why choose Cyphere as internal penetration testing company?
Excellent people to work with.
"Very good knowledge of requirement and give us correct findings with excellent remedy to improve our security for our B2B portal site."
Harman was great, really knowledgeable
"Harman was great, really knowledgeable, helpful and on hand to answer any questions. The final report was very clear providing all the technical information."
My experience of the team was 5 star.
"They were so helpful, and their technical delivery and client communication were excellent."
Extremely satisfied
"Extremely satisfied with their approach, speed and end results that I got for my company. Big Thanks."
Experienced Team
"Great experienced team, very knowledgable and helpful, willing to adjust the product to suit the customer. Would recommend."
Professional Work
"A totally professional engagement from start to finish with the highest quality advice and guidance."
High Quality Testing Service
"The service provided by Cyphere is second to none. High quality testing services. Very reliable and professional approach."
Assured Service
"Cyphere provide a personal and assured service, focusing on both pre and post analysis in supporting us to change and embed a security cultured approach."
Recommended Service
"Highly recommend Cyphere for pen testing. The recommendations in the report were comprehensive and communicated so that technical and non-technical members of the team could follow them."
Recommended Pen Testing Service
"Cyphere were great in both carrying out our penetration testing and taking us through the results and remediation steps. We would gladly use them for future projects.
Highly Recommended
"We had penetration tests service for PCI DSS compliance program from the Cyphere! Very professional, efficient communication, great findings that improved our system security posture! Highly recommended!
Exceeded Expectations
"Harman and the team at Cyphere truly are experts in their field and provide an outstanding service! Always going above and beyond to exceed customer expectations.
Skilled Team
I’ve worked with Cyphere on a number of penetration tests in addition to some cyber essentials support and certification! I’ve found them to be highly skilled and professional.
Skilled Team
I’ve worked with Cyphere on a number of penetration tests in addition to some cyber essentials support and certification! I’ve found them to be highly skilled and professional.
Perceptive Reporting
Cyphere undertook pen testing for us recently. The process was very smooth, and the team were flexible in working around our constraints. The report was clear, actionable and perceptive.
Outstanding Cybersecurity Partner
Cyphere has been outstanding partner to our agency. I've tried many in the past but they have been extremely meticulous in getting our systems secured.
Helpful Services
Cyphere has been an excellent partner and helped us achieve our goals with a great level of expertise, communication and helpfulness making the whole process easy to understand and complete.
High Standards
Harman and his team were excellent throughout, they understood and completed the tasks (external penetration test) within tight deadlines to a high standard.
Communicative & Responsive Team
I had an amazing experience working with Cyphere! Their communication was top-notch, making the entire process smooth and efficient. I found their team to be incredibly responsive and attentive to my needs.
Efficient Service
Worked with team at Cyphere for a cyber security assessment, gap analysis etc. The team has delivered a very professional, efficient service at all stages of the process to date.
Benefits of Internal Network Penetration Tests
Internal penetration testing is a process where penetration testers attempt ethical hacking techniques to compromise their customer networks. This process involves manual testing to simulate an internal user or malicious insider threat and identify weaknesses in information security program. Pen tests help organisations find vulnerabilities that could be exploited by malicious insiders before they have a chance to do real damage.
Internal penetration testing can help find data security gaps or flaws and assess your security controls’ accuracy by simulating real-world cyber attacks against your systems. Pen tests can also help address security compliance areas such as PCI DSS, ISO 27001 and to identify any gaps or deficiencies in your security posture. This helps you to assess against best practices and prioritise remediation efforts. By using internal pen testers with extensive knowledge of your organisation’s systems and networks, application security and related skills you can get the most accurate and realistic assessment of your security controls.
Internal pen testing ensures stress testing of access controls, and opportunities to exploit vulnerabilities, simulating many elements of a cyber attack utilising various attack vectors. Internal pen testing determines in-depth third party access to resources by simulating an attack from a malicious outsider. This type of testing is used to identify vulnerabilities that could be exploited by a cybercriminal in order to gain access to sensitive data or systems.
An internal network assessment assesses a company’s security posture and looks for any vulnerabilities that malicious actors could exploit. By identifying these vulnerabilities, the organisation can mitigate the risk of a data breach or other security incident. Pen testers or ethical hackers may use various methods to identify strategic issues, including scanning networks and related network infrastructure assets such as printers, devices.
IP Addresses and systems for open ports and vulnerable applications, exploiting known vulnerabilities but not using social engineering techniques (it’s part of red teaming or explicitly agreed on scopes). Vulnerability scanning is often recommended on regular basis as a way to measure changing attack surface internally.
An internal penetration test is a great way to demonstrate your organisation’s commitment to data security. Pen tests are also a valuable way to educate employees about the dangers of cybercrime and how they can help protect the organisation’s networks and data. By raising awareness and empowering employees to be part of the solution, you can help create a culture of cybersecurity within your organisation.
An internal network assessment can help shape IT strategy and investments in a few key ways. First, it can help identify which systems are most at risk for attack and need to be fortified with stronger security measures. Second, pen tests can help prioritise investment areas to ensure that the most critical systems are given the necessary resources, whether cloud environments, on-premises or general corporate networks. Third, it can help identify gaps in security that may need to be addressed with additional software or personnel. And finally, regular pentesting can help keep management aware of the latest insider threats and how best to counter them.
Internal Infrastructure Penetration Testing Methodology
In order to perform internal network infrastructure penetration testing, it is important to understand the context of assets in the scope of the engagement. Our proven approach to security assessments is based on more than a decade of experience, industry practices and effective ways to exceed customer expectations.
Cyphere’s security testing methodology is broken down into five phases as demonstrated in the adjacent diagram.
- Initial Scoping & Objectives Agreement
- Reconnaissance
- Scanning
- Exploitation
- Reporting – See this article about pen-testing reports
- Remediation (Optional remediation consultancy to help mitigate risks identified during penetration testing)
