Adversary Simulation Services

Test Your Defences Against Realistic Cyber Attacks

Our adversary simulation services test your people, processes and technology, revealing how an attack could unfold and where your cyber defences need strengthening.

Choose from breached credential, social engineering and assumed breach simulations, or test your wider resilience through a full red team assessment.

CREST-certified ethical hackers

UK-based cyber security team

Controlled, risk-led attack simulations

Clear, prioritised remediation guidance

Our Adversary Simulation Services

Which Service?

How it works

FAQs

Why Stripe OLT?

Our
Awards

Find Out How Your Defences Perform Under Attack

Security controls may look effective on paper, but their true value is shown when they are tested against realistic attacker behaviour.

Our CREST-certified team uses controlled attack simulations to test how your people, technology and security processes work together. We assess whether malicious activity is prevented or detected, how effectively your team responds and how far an attacker could progress.

Drawing on our experience across offensive security, Microsoft security and managed detection and response, we consider the complete attack path rather than isolated weaknesses. You receive clear evidence of what worked, what did not and where your defences should be strengthened.

Speak to us about our Offensive Security Services

Our Adversarial Security Services

Every organisation has different systems, risks and security objectives. We offer a range of controlled attack simulations, from testing a specific scenario through to testing your wider resilience against determined attackers.

Breached Credential Simulation

Find out what could happen if an attacker obtained valid login details and used them to access your environment.

Our team simulates the controlled use of compromised credentials to assess whether suspicious account activity would be detected and stopped, and how far an attacker could progress within your environment. We test the effectiveness of your identity, endpoint and monitoring controls, while identifying opportunities for an attacker to escalate privileges, move between systems and expand their access across your environment.

Typical focus areas:

Detection of suspicious credential use and account activity

Effectiveness of identity and endpoint security controls

Privilege escalation opportunities

Lateral movement and monitoring visibility gaps

Contact our Experts

Hooded figure item with speech bubble and phishing email

Adversarial Social Engineering Campaign

Find out whether your employees can recognise and respond to the manipulation techniques attackers use to gain information or initial access.

Social engineering remains one of the most effective ways to bypass technical defences, and now AI is making convincing and personalised attacks easier to create at scale. Our team runs controlled campaigns designed around your organisation to measure employee responses and assess whether suspicious activity is reported and escalated effectively.

Typical focus areas:

Targeted phishing and pretext-based campaigns

Impersonation, information gathering and disclosure

Credential capture and user interaction

Awareness training, reporting and escalation effectiveness

Contact our Experts

Assumed Breach Attack Simulation

Find out how effectively your organisation can detect, respond to and contain an attacker who has already gained access to your environment.

Unlike traditional penetration testing, this simulation starts from an agreed point of compromise. Our team performs controlled, objective-based attack activity to assess how far an attacker could progress and how effectively your security controls and response teams prevent, detect and contain them.

Typical focus areas:

Command-and-control, payload and persistence detection

EDR/XDR and security monitoring effectiveness

Privilege escalation, lateral movement and attack paths

SOC investigation, containment and response performance

Contact our Experts

Hooded figure icon with path to goal flag

Red Team Attack Simulation

Find out how your organisation would withstand a determined attacker conducting a realistic, multi-stage attack across your people, processes, technology and physical security.

Our red team uses controlled, objective-based scenarios to emulate the tactics, techniques and procedures of real-world APTs and criminal groups. Testing can span the full cyber kill chain, assessing whether an attacker could gain access, avoid detection and reach an agreed target.

Typical focus areas:

Reconnaissance, social engineering and initial access

Privilege escalation, persistence and lateral movement

Detection evasion, data exfiltration and security monitoring

SOC and incident response effectiveness

Discover our Red Team Services

Find the Right Adversary Simulation

Each simulation tests a different stage of an attack. The right choice depends on whether you need to assess credential misuse, human behaviour, post-compromise activity or your complete organisational response.

Choose a Breached Credential Simulation if you:

Want to understand what an attacker could achieve using a legitimate account
Need to validate identity controls and detection of suspicious account activity
Are concerned about privilege escalation or movement between systems

Choose an Adversarial Social Engineering Campaign if you:

Need to assess employee susceptibility to phishing, impersonation or manipulation
Want to validate security awareness, reporting and escalation processes
Are concerned about increasingly convincing and scalable AI-assisted attacks

Choose an Assumed Breach Attack Simulation if you:

Want to test how your organisation responds after an attacker gains access
Need to validate EDR/XDR, security monitoring or SOC capabilities
Want to assess detection, containment and incident response processes

Choose a Red Team Attack Simulation if you:

Need to test a complete attack chain against a defined objective
Want to assess resilience across people, processes, technology and physical security
Have mature security controls that require a broader, targeted challenge

Combine Simulations if you:

Need to test connected stages of an attack
Want to combine initial access with internal attacker activity
Require a phased programme covering several security objectives

How Our Adversary Simulations Work

Every engagement is carefully planned, controlled and aligned with your organisation’s objectives. The exact activity varies by service, but our core process remains consistent.

1. Scoping and Objective Setting

We agree what you want to test, the systems and people in scope, testing boundaries, safety controls and rules of engagement.

2. Scenario Development

Our team creates realistic attack scenarios based on your environment, risks and the security capabilities you want to assess.

3. Controlled Attack Simulation

We perform the agreed activity using relevant attacker tactics and techniques while operating within defined safety and escalation procedures.

4. Detection and Response Assessment

We assess how your people, security controls and response teams identify, investigate, escalate and contain the simulated activity.

5. Analysis and Reporting

We document attack paths, successful controls, identified weaknesses and response gaps, with clear evidence and prioritised recommendations.

6. Debrief and Next Steps

Our team walks technical and non-technical stakeholders through the findings and supports you in deciding what should be addressed first.

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

Combine Testing Across Your Cyber Defences

Real attacks rarely involve a single technique. They can combine exposed vulnerabilities, social engineering, compromised identities and post-compromise activity to reach a defined objective.

We can combine adversary simulations with our wider offensive security services. This helps you identify weaknesses, test whether they can be exploited and assess how effectively your organisation detects and responds to the resulting activity.

Common combinations include:

Adversarial Social Engineering Campaign + Breached Credential Simulation

Breached Credential Simulation + Assumed Breach Attack Simulation

Penetration Testing + Assumed Breach Attack Simulation

Attack Surface Review + Red Team Attack Simulation

Security Configuration Review + Breached Credential Simulation

Phased adversary simulation and offensive security programmes

Discuss a Combined Security Programme

What our Clients Say

Adversary Simulation FAQs

What is adversary simulation in cyber security?

Adversary simulation safely recreates the tactics and behaviours of real attackers to test an organisation’s cyber defences. At Stripe OLT, we use controlled scenarios to assess how effectively your people, processes and technology prevent, detect and respond to malicious activity.

What is a cyber adversary?

A cyber adversary is an individual or group attempting to compromise an organisation. This can include cybercriminals, malicious insiders, hacktivists and state-sponsored groups. Our simulations recreate relevant attacker behaviours without exposing your organisation to an uncontrolled threat. At Stripe OLT, our simulations act as a cyber adversary and recreate relevant attacker behaviours in a controlled environment, allowing you to test your defences without exposing your organisation to an uncontrolled threat.

How is adversary simulation different from penetration testing?

Penetration testing identifies exploitable vulnerabilities within a defined system or environment. Adversary simulation examines how an attack could progress across people, processes and technology, and whether your controls and teams would detect and contain it. At Stripe OLT, we offer services that take either approach independently or the option to combine them as part of a wider offensive security programme.

What is the difference between assumed breach simulation and red teaming?

Assumed breach simulation starts from an agreed point inside your environment and focuses on post-compromise activity. Red teaming can simulate the complete attack chain, from reconnaissance and initial access through to a defined objective. At Stripe OLT, we can scope the approach around the security capabilities, attack stages and business objectives and recommend the best services to achieve this.

Is adversary simulation safe?

Yes. Stripe OLT agrees the scope, rules of engagement, safety controls and escalation procedures before a simulation begins. All activity is controlled and authorised to minimise unnecessary disruption.

Will our employees or security team know about the simulation?

This depends on its objectives. Selected stakeholders will authorise and oversee the engagement, while other employees or response teams may remain unaware so their response can be assessed realistically. At Stripe OLT, selected stakeholders authorise and oversee the simulation, while other employees or response teams may remain unaware; especially where this is required to assess their response realistically.

What does a final report include?

Stripe OLT provides clear evidence of attack paths, effective controls, identified weaknesses and detection or response gaps. Depending on the service, reports also include prioritised recommendations and a debrief for technical and non-technical stakeholders.

Why Choose Stripe OLT?

UK TEAM

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.

Microsoft

Microsoft Security Expertise

As a Microsoft Solutions Partner for Security, with Cloud Security and Threat Protection specialisations, we understand the identity, endpoint and monitoring technologies used across Microsoft 365, Azure and hybrid environments.

Control

Secure, Controlled Delivery

Our work follows ISO 27001-certified processes for handling information securely throughout scoping, testing and reporting. Every simulation operates within agreed rules of engagement, safety controls and escalation procedures.

Reporting

Reporting for Every Stakeholder

Reports include clear evidence, attack paths, effective controls, identified gaps and prioritised recommendations. We support this with a walkthrough that helps technical teams and decision-makers understand the findings and agree their next steps.

Speak to the experts

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