Internal Penetration Testing | Cyber Security Services

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Internal Infrastructure Penetration Testing

Securing your internal network is just as vital as protecting your external systems.

Internal Infrastructure Penetration Testing is designed to identify weaknesses within your organisation’s internal environment, which could be exploited by insiders or lateral attackers. By mimicking real-world attack strategies, we help you discover vulnerabilities that could lead to data breaches, unauthorised access, or system compromise.

Internal Infrastructure Penetration Testing​

Why Internal Infrastructure Penetration Testing?

Internal Infrastructure Penetration Testing involves a comprehensive assessment of your internal network to uncover security weaknesses that could be exploited by malicious actors.

Our CREST, CHECK, and Cyber Scheme certified consultants simulate real-world attack scenarios to evaluate the effectiveness of your internal defences.

Insider Threat Detection

Identify vulnerabilities that could be exploited by malicious insiders or attackers who have gained access to your internal network. This helps prevent data breaches and unauthorised access.

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Enhanced Network Segmentation

Evaluate the effectiveness of your internal network segmentation, ensuring that sensitive data and critical systems are properly isolated to limit potential damage from a breach.

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Improved Incident Response

Test your organisation's ability to detect, respond to, and mitigate attacks from within, ensuring your response plans are effective against real-world threats.


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Comprehensive Risk Assessment

Gain a thorough understanding of internal security risks, providing valuable insights into areas that require immediate attention or improvement to strengthen your overall security posture.

Internal vs External Penetration Testing

Internal Infrastructure Penetration Testing
Focuses on internal network vulnerabilities
Assumes some prior network access
Identifies risks of lateral movement or data theft
Covers internal systems like servers and workstations
Simulates insider threats or compromised devices
External Infrastructure Penetration Testing
Targets public-facing systems
Starts with no prior network access
Seeks entry points
Tests internet-facing assets
Mimics hacker activity

“Once the testing phase was complete, CyberLab delivered the report quickly. A team from CyberLab, including a Senior Director, presented the results to senior executives at Nottingham City Council, answered questions and provided interpretation and context for the scores.”

– Mark Smith, Server Support Manager, Nottingham City Council

Nottingham Council Success Story

Why Choose CyberLab?

Thousands of organisations across the UK trust us, here’s why…

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CREST & CHECK Accredited

We are certified for both CREST and CHECK Green Light testing - an achievement not all testing companies can claim.

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CREST Infrastructure & Application Testing

We are certified in both CREST Infrastructure and Application testing, ensuring comprehensive security coverage for all your systems.

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Experienced & Senior Consultants

Our team consists of highly experienced, senior consultants and penetration testers with over 15 years of industry expertise.

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Outstanding Communication

We establish dedicated teams or Slack channels to ensure seamless two-way communication between project managers, testers, and your team throughout the entire project.

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Clear and Concise Reports

We provide easy-to-understand reports with detailed findings and actionable recommendations.

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Specialised Testing Teams

We have specialised teams for Cloud, Application, and API testing. Our app and API testers, who are former developers, communicate fluently with your development team, leveraging their coding expertise to deliver deeper, more effective testing.

Sophos MDR

We Save You Time and Money

Clients consistently tell us that we deliver higher-quality testing in less time.

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Forward-Thinking Security

Our pen testing team goes beyond identifying vulnerabilities, offering proactive solutions to mitigate future risks and ensure your security evolves ahead of emerging threats.

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Success Story

COP 26 Summit

Identity Events Management, the agency contracted to deliver the 2021 United Nations Climate Change Conference (COP26), needed to ensure that their defences were secure for the conference.

‘We were delighted to be involved in the security testing surrounding the United Nations Climate Change Conference, and to work alongside Identity as they delivered hybrid event solution. At CyberLab, working securely from anywhere is ingrained in our company, and this event really encapsulated this new way of working and accessing events.’

– Gavin Wood, CEO, CyberLab

Internal Penetration Testing: The CyberLab Approach

Our Internal Penetration Tests replicate the techniques used by malicious insiders or compromised devices to target vulnerabilities within your internal network. By simulating real-world attack scenarios, we evaluate how effectively your internal systems and processes can detect, respond to, and mitigate threats.

One of our CREST, CHECK, and Cyber Scheme certified consultants will collaborate with you to define the scope of the engagement, ensuring our tests target your internal infrastructure effectively and meet your security requirements.

Your assigned consultant will gather critical information about your internal environment, including:

  • Network topology and architecture
  • Internal IP address ranges
  • Active Directory structure
  • Shared drives and resources
  • User roles and permissions

This information helps us identify and exploit vulnerabilities specific to your internal systems.

In this stage, we identify potential vulnerabilities within your internal network by examining:

  • Internal attack vectors and threat agents
  • Results from research and reconnaissance
  • Weaknesses in system configurations, network protocols, and access controls
    Our specialists use a combination of automated tools and manual testing to ensure comprehensive analysis.

We attempt to exploit identified vulnerabilities to simulate real-world attack scenarios. This involves three key phases:

  • Exploit: Leveraging vulnerabilities to gain access to internal systems, e.g., exploiting misconfigured services or outdated software.
  • Escalate: Attempting to elevate access privileges, such as obtaining administrator or root-level control.
  • Advance: Moving laterally across the network, accessing additional systems and resources, and uncovering further vulnerabilities.

Your Internal Penetration Test Report will provide a detailed account of identified vulnerabilities, their potential impact, and prioritised remediation steps.

  • Includes an executive summary and technical analysis to communicate risks in business terms.
  • Where needed, your CyberLab consultant can present the findings to key stakeholders in your organisation.

The report will outline recommended actions to mitigate vulnerabilities and strengthen your internal network’s defences.

  • We also offer consultancy, tools, and services to support your remediation efforts and enhance your overall security posture.

CREST, CHECK & Cyber Scheme Certified

CREST (the Council of Registered Ethical Security Testers) is an international accreditation with a strict Codes of Conduct and Ethics. CHECK is the Government-backed accreditation from the National Cyber Security Centre (NCSC) which certifies that a company can conduct authorised penetration tests of public sector systems and networks.

All our penetration testers are certified by CREST, with senior consultants certified by CREST to the highest CCT Level. Our testers are also either CHECK Team Leaders (CTL’s) or Team Members (CTM’s).

Security testers that pass the Cyber Scheme exams demonstrate ‘competence and skill at the highest levels’ as defined by the National Technical Authority for Cyber Security (NCSC).

Our team have decades of combined experience and take pride in operating at the highest level of the industry – conducting a broad range of government and commercial tests – and always aim to go the extra mile.

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Red Teaming vs Penetration Testing

Red Team
We test systems simultaniously
We work to fluid, adaptable targets
Longer testing schedule
We don't tell your people what we're doing
Our testers will be creative and use any means necessary
Pen Test
We test systems independently
We define our targets before we start
Short term tests
Your people know what we're testing and when
Our testers use a suite of commercially available testing tools

Speak With an Expert

Enter your details and one of our specialists will be in touch.

Whether you’re looking to implement basic cyber security best practice, improve your existing defences, or introduce a new system or solution, our team of expert consultants, engineers, and ethical hackers are here to help.

Our team specialise in creating bespoke security solutions and testing packages to improve and maintain your security posture.

We are 100% vendor agnostic and will only ever recommend the best products and solutions for your requirements.

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CyberLab Simulate Attack in front of Cyber Crime Police
 
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Your CREST Accredited Penetration Test Report