Offensive Cyber Security Services

Your trusted partner to navigate risk and build resilience

Proactively identify weaknesses, validate your security controls and understand how your organisation would respond to real-world attack scenarios.

Our offensive security team helps assess risk across applications, infrastructure, people, processes and technology, turning offensive security findings into clear, prioritised remediation actions.

CREST-certified ethical hackers

UK-based cyber security team

Clear, prioritised reporting

CREST, SANS & ISO 27001

vCISO level expertise

Work with NHS, legal, finance & governmental clients

Penetration Testing

Adversarial

Professional Security

Which Service?

How it works

Why Stripe OLT?

Our
Awards

Proactive Security Testing Built Around Real-World Risk

Threat actors do not attack in neat categories. They chain vulnerabilities across people, processes and technology, using the weakest available route into an organisation.

With UK Government data showing cyber breaches and attacks affected 65% of medium businesses and 69% of large businesses in the last 12 months, proactive security testing helps validate risk before it is exploited.

Our Offensive Security Services identify exploitable weaknesses, validate security controls and assess how well your organisation could detect, prevent and respond to real-world attack scenarios.

Services can be delivered as focused assessments or combined into a wider programme, helping you prioritise remediation by exploitability, business impact and urgency.

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Penetration Testing Services

Our penetration testing services identify exploitable technical weaknesses across applications, infrastructure, wireless environments and physical security controls. Each assessment is scoped around a defined environment or objective, with findings translated into clear, prioritised remediation guidance.

Application Penetration Testing

Assess web, mobile, API and thick client applications to understand where weaknesses could expose sensitive data, user accounts or critical business processes.

Typical focus areas:

Customer-facing and internal applications

Authentication and access control

API security and integrations

Business logic and configuration risk

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Infrastructure Penetration Testing

Assess internal, external and cloud-integrated infrastructure to understand how weaknesses could expose systems, services, identities or critical data.

Typical focus areas:

External perimeter and exposed services

Firewall, VPN and remote access weaknesses

Internal segmentation and trust boundaries

Identity, server and cloud configuration risk

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Wireless Penetration Testing

Assess wireless infrastructure and connected devices to understand where weaknesses could allow unauthorised access, interception or movement into internal environments.

Typical focus areas:

Wireless protocol and encryption weaknesses

Rogue access point exposure

Guest and corporate network separation

Client isolation and management access

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Physical Penetration Testing

Assess physical access controls, building security and staff awareness to understand whether an unauthorised person could gain access to restricted areas, sensitive information or internal infrastructure.

Typical focus areas:

Perimeter and entry point security

Tailgating and access control bypass

Restricted area and visitor management

Physical access to devices or infrastructure

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AI & LLM Application Penetration Testing

Assess standalone and integrated AI applications to understand how attackers could manipulate model interactions, bypass safeguards, expose sensitive information or abuse AI-driven workflows.

Typical focus areas:

Prompt injection and guardrail bypass

Sensitive data disclosure and context leakage

Insecure output handling and excessive permissions

Plugin, agent, integration and orchestration weaknesses

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API Penetration Testing

Assess APIs supporting web and mobile applications, system integrations and data exchange to understand where weaknesses could expose sensitive data, user accounts or critical functionality.

Typical focus areas:

Our professional security services provide focused assurance over configurations, endpoint build standards and external exposure. These reviews help identify control gaps and security weaknesses before they become exploitable attack paths.

Security Configuration Review

Review key platforms, services and technologies to identify misconfigurations, weak defaults and gaps in security-critical controls.

Typical focus areas:

Hardening and baseline configuration

Identity and access control settings

Logging, monitoring and alerting configuration

Insecure defaults and weak policy enforcement

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Device Build Security Assessment

Assess workstation, laptop or endpoint build standards to understand whether devices are securely configured, consistent and aligned to intended security baselines.

Typical focus areas:

Local configuration and hardening standards

Privilege and local administrator controls

Endpoint protection and EDR validation

Patch posture and software baseline review

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Attack Surface Review

Assess your external footprint from an attacker’s perspective to identify exposed assets, public-facing services, leaked information and unknown areas of exposure.

Typical focus areas:

Internet-facing assets and exposed services

Command-and-control and payload detection

Leaked credentials or sensitive information

External risk prioritisation and remediation guidance

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Which Offensive Security Assessment Is Right For You?

Choosing the right assessment depends on your organisation’s risk profile, maturity, objectives and the security challenges you need to address.

Choose Penetration Testing if:

You need to identify exploitable technical vulnerabilities in a defined application, network, infrastructure environment, wireless environment or physical location. Pen testing is best suited to focused assurance over specific assets or environments.

Choose Adversarial Services if:

You want to understand how realistic attacks could unfold across users, identity, endpoint controls, monitoring and response processes. Adversarial testing validates how well your organisation can detect, contain and respond to attack scenarios.

Choose Professional Security Services if:

You need focused assurance over configurations, endpoint builds, external exposure or specific security controls. These services help identify control gaps before they become exploitable attack paths and can support governance or compliance readiness against relevant standards such as Cyber Essentials , ISO 27001, GDPR and PCI DSS, where applicable.

Choose a Combined Programme if:

You want broader offensive security coverage across multiple risk areas. Combined programmes can help you assess risk across your entire attack surface, including applications, infrastructure, users, identity, external exposure and response capability as part of a joined-up approach.

How Our Offensive Testing Works

Our testing process is scoped, controlled and designed to give your team clear evidence of risk without unnecessary disruption.

1. Scoping and validation

We confirm objectives, assets, access requirements, rules of engagement and testing boundaries before work begins.

2. Reconnaissance and discovery

We identify relevant systems, services, exposure points and potential attack paths within the agreed scope.

3. Automated and manual assessment

We use appropriate tooling and consultant-led testing to identify weaknesses, validate findings and reduce false positives.

4. Exploitation and attack path validation

Where appropriate, we safely validate whether weaknesses can be exploited in practice, including multi-step attack paths where relevant.

5. Threat and risk context

We assess findings in the context of realistic attacker behaviour, exploitability and likely business impact.

6. Risk prioritisation

We prioritise findings based on exploitability, business impact and remediation urgency.

7. Reporting and workshop

We deliver a clear report and walk your team through the findings, risks and recommended next steps.

Tailored Offensive Security Programmes

Combined Security Testing and Services

Many organisations combine multiple offensive security services to build broader visibility across their entire attack surface, including applications, infrastructure, identity, users, security controls and response processes.

Common service combinations include:

Application Pen Testing + Infrastructure Pen Testing

Wireless Pen Testing + Infrastructure Testing

Physical Pen Testing + Infrastructure Testing

Social Engineering Assessment + Assumed Breach Simulation

Breached Credential Simulation + Infrastructure Testing

Application Pen Testing + AI / LLM Application Testing

Full-scope adversarial simulation programme

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What our Clients Say

Offensive Cyber Security FAQs

What are offensive security services?

Offensive security services are proactive assessments designed to identify vulnerabilities, validate controls and test how an organisation could withstand realistic attack scenarios. At Stripe OLT, these services include penetration testing, adversarial simulation and targeted assurance reviews that help you understand exploitable risk before weaknesses are used by attackers.

How does offensive security compare with traditional cyber security?

Traditional cyber security focuses on keeping threats out through controls such as Managed SOC, Microsoft Sentinel, Microsoft Defender XDR, incident response and security monitoring. Offensive security tests whether those defences work under realistic conditions by simulating attack paths, validating controls and identifying weaknesses before attackers exploit them.

How does Attack Surface Review support attack surface management?

Attack surface management is the ongoing practice of maintaining visibility over all internet-facing assets, identifying external risks and prioritising remediation before vulnerabilities can be exploited. Effective attack surface management requires maintaining visibility over all internet-facing assets and rapidly responding to new threats using advanced scanning techniques.

At Stripe OLT, an Attack Surface Review provides a point-in-time assessment of how your organisation appears from the outside, helping identify exposed assets, public-facing services, leaked information, misconfigurations and other indicators that may increase the likelihood of attack. This can support wider attack surface management activity by giving your team a clearer view of external exposure, newly identified risks and what should be prioritised for remediation.

How does vulnerability scanning support offensive security testing?

Vulnerability scanning is an automated process that uses specialist tools to detect known vulnerabilities across IT assets, often based on software versions, services or configurations. At Stripe OLT, scanning can support discovery and assessment across systems, applications and networks, but consultant-led validation is still needed to understand exploitability, business impact and remediation priority.

How is offensive security different from penetration testing?

Penetration testing focuses on finding exploitable technical weaknesses within a defined scope, such as an application, infrastructure environment, wireless network or physical location.

At Stripe OLT, penetration testing sits within a wider offensive security approach that can also include adversarial simulation, security configuration reviews, device build assessments and attack surface review. This means we can help you test specific assets, validate security controls and assess how well your organisation detects, contains and responds to realistic attack scenarios.

When should we choose adversarial testing?

Choose adversarial testing when you want to understand how well your organisation would detect, prevent and respond to realistic cyber threats and attacker behaviour. At Stripe OLT, adversarial services can help validate resilience against credential misuse, social engineering, assumed breach scenarios and red team attack simulation across people, processes and technology.

How is offensive security testing scoped and priced?

At Stripe OLT, offensive security testing is scoped around what needs to be assessed, how complex the environment is and how deep the testing needs to go. Pricing may depend on the number of applications, systems, locations, user roles, access levels, testing objectives and reporting requirements. We provide clear assumptions, defined deliverables and fixed-scope pricing before testing begins.

Can testing be phased across the year?

Yes. Stripe OLT can deliver offensive security testing as a one-off assessment or as part of a wider programme. Many organisations phase testing around development cycles, budget availability, major system changes or compliance deadlines, helping them spread activity across the year while prioritising the highest-risk areas first.

What does the final report include?

Stripe OLT offensive security reports include findings, risk ratings, technical evidence, business impact, remediation guidance and prioritised next steps. We explain results clearly for security teams, technical teams and non-technical stakeholders, helping your organisation understand what was found, why it matters and what should be addressed first.

Do you provide support after testing?

Yes. Stripe OLT provides a reporting workshop, clarification support and optional remediation validation where appropriate. This helps your team understand the findings, plan remediation activity and confirm whether agreed fixes have addressed the identified risks.

Why Choose Stripe OLT?

Expertise

CREST-Certified UK Security Experts

Work with experienced UK-based offensive security consultants holding recognised industry certifications. Our specialists support you throughout scoping, testing, reporting and follow-up.

Reporting

Clear, Actionable Reporting

Findings are translated into practical remediation guidance for security teams, technical teams and non-technical stakeholders, helping everyone understand the risk, business impact and required actions.

Flexibility

Flexible Engagement Models

Choose focused point assessments, combined testing packages or broader offensive security programmes. Each engagement can be shaped around your scope, timeline, risk priorities and budget.

Assurance

Risk-Led Testing and Compliance Support

Testing is shaped around realistic attack paths, business impact and remediation priority, helping your team focus on the issues that matter most. It can also support internal assurance and compliance readiness against relevant standards, including Cyber Essentials, ISO 27001, GDPR and PCI DSS, where applicable.

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