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Continuous Adversarial Simulation
Test your resilience the way real attackers operate
Continuous Adversarial Simulation (CAS) is Zensec’s year-round offensive security service, designed to replicate how real-world threat actors behave - persistent, adaptive, and focused on achieving objectives over time.
About Continuous Adversarial Simulation
We deliver continuous, real-world adversarial testing designed to assess how your organisation performs against evolving threats over time.
CAS transforms red teaming from a point-in-time exercise into an ongoing programme. Instead of a single snapshot, you gain a dynamic view of your security posture as infrastructure, users, and threats change.
Our approach mirrors real attackers – testing multiple entry points, adapting attack paths, and pursuing objectives through different routes until they succeed or are stopped.
This provides something far more valuable than a traditional report:
clear, ongoing evidence of your organisation’s ability to detect, respond to, and contain attacks.
Our CAS services include:
- External attacker simulations
- Assumed breach and insider threat scenarios
- Social engineering (phishing, vishing, SMS, service desk)
- Identity and credential abuse testing
- Lateral movement and privilege escalation
- Cloud and hybrid environment attack paths
- Replay and retesting of attack objectives
- Continuous attack surface and exposure analysis
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Why choose Zensec
Zensec’s skilled red team specialists deliver advanced expertise in offensive security, ethical hacking, and adversarial simulation. Our team has extensive experience conducting red team engagements for complex organisations, including those operating within highly regulated UK industries.
- Realistic simulations based on genuine attack techniques used by today’s threat actors
- Engagements aligned to UK regulatory expectations and board-level risk priorities
- Clear insight into your organisation’s detection, response, and containment capabilities
- Practical recommendations that support long-term resilience and continuous improvement
- Seamless integration with wider security services, including penetration testing, vulnerability management, and security assurance
Continuous Adversarial Simulation provides one of the most effective ways to evaluate how your organisation would respond to a genuine cyber attack over time. These ongoing exercises uncover weaknesses, challenge defensive controls, and provide the intelligence needed to strengthen resilience against sophisticated and evolving threats.
We are equipped to deal with an attack from any ransomware group.
Don’t hesitate to contact us if you are under attack from a ransomware group not listed above.
The importance of Continuous Adversarial Simulation
Cyber threats are persistent, adaptive, and increasingly sophisticated. A one-off test cannot accurately reflect this reality.
Continuous testing ensures your organisation is not just secure at one point in time, but resilient over time.
By simulating real-world attack behaviour across a structured programme, CAS helps you:
- identify whether weaknesses are isolated or systemic
- validate that security improvements are working
- understand how attack paths evolve as your environment changes
- ensure detection and response capabilities improve continuously
Known threat actors
Ransomware groups behind the attacks
Below is a breakdown of the most active ransomware groups and the variants driving their attacks.
The Zensec 6-step Continuous Adversarial Simulation process
We don’t just run tools, we simulate offensive security tactics to give you a complete picture of your organisation's security posture.
1. Programme Mobilisation & Objective Setting
We begin by defining what matters most to your organisation.
This includes identifying critical assets, agreeing attack objectives, and establishing rules of engagement, reporting cadence, and success criteria.
2. Adversary Reconnaissance
Our team builds a real-world attacker view of your organisation.
We analyse your external footprint, exposed services, identity risks, and potential entry points to understand how you appear from the outside.
3. Attack Path Development
Reconnaissance is converted into realistic attack-path hypotheses.
We prioritise likely routes to compromise and design campaigns aligned to your risk profile and business objectives.
4. Campaign Execution
We simulate real-world attacks across structured campaign phases. This may include external compromise, phishing, credential abuse, lateral movement, or cloud-based attack paths – all aligned to agreed objectives.
5. Replay, Retesting & Validation
Unlike traditional testing, we don’t stop after one attempt.
We retest key scenarios, replay objectives through alternative routes, and validate whether remediation has genuinely reduced risk.
6. Review, Reporting & Continuous Improvement
You receive ongoing insight into your security posture.
Through monthly reviews and strategic checkpoints, we track progress, highlight trends, and continuously refine the programme to improve resilience over time.
Our Managed Security services
Our security analysts provide continuous monitoring of your environment, ensuring potential security incidents are identified and investigated as quickly as possible.
By monitoring security events across your infrastructure, we help reduce risk and improve visibility into suspicious activity before it becomes a serious business issue.
Our threat detection and incident response capabilities help identify malicious activity, investigate potential compromises and support remediation efforts before damage occurs.
By combining advanced security tools with expert analysis, we help organisations respond effectively to security incidents and minimise disruption.
Attackers frequently exploit unpatched vulnerabilities and misconfigurations to gain unauthorised access to systems and data.
Our vulnerability management services identify weaknesses through regular vulnerability scanning and assessments, helping organisations prioritise remediation efforts and reduce overall security risk.
With users working from multiple locations and on various devices, endpoint protection has become a critical component of every security strategy.
We help secure endpoints across your organisation, providing visibility, monitoring and management capabilities that reduce opportunities for attackers to compromise users and devices.
As organisations continue to adopt cloud environments such as Microsoft 365 and Azure, maintaining visibility and control becomes increasingly important.
Our managed security services help secure cloud infrastructure, applications and data, supporting regulatory compliance, business continuity and long-term resilience.
Effective firewall management plays a crucial role in maintaining a strong security posture and protecting critical business systems.
Our team helps configure, monitor and optimise security controls to ensure your network security infrastructure remains aligned with best practices and emerging threats.
Meeting regulatory compliance obligations can be a significant challenge for many organisations operating in complex security environments.
Our Managed Security Services support compliance initiatives through ongoing monitoring, reporting and visibility, helping organisations strengthen their security posture and align with frameworks such as Cyber Essentials, Cyber Essentials Plus, ISO 27001 and GDPR.
Meeting regulatory compliance obligations can be a significant challenge for many organisations operating in complex security environments.
Our Managed Security Services support compliance initiatives through ongoing monitoring, reporting and visibility, helping organisations strengthen their security posture and align with frameworks such as Cyber Essentials, Cyber Essentials Plus, ISO 27001 and GDPR.
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Frequently asked questions
Key information when you’re under pressure.
Continuous Adversarial Simulation (CAS) is an ongoing security testing service that simulates real-world cyber attacks over time. Unlike one-off assessments, it continuously tests your organisation’s ability to detect, respond to, and contain threats as your environment evolves.
Penetration testing is a point-in-time exercise focused on identifying vulnerabilities. CAS is a continuous programme that goes further - simulating attacker behaviour, testing multiple attack paths, and validating whether security improvements are effective over time.
Traditional red teaming is time-limited and scenario-based. CAS extends this into a year-round approach, allowing repeated testing, replay of attack objectives, and continuous measurement of your organisation’s resilience.
CAS can include a wide range of attack simulations, such as external attacks, phishing and social engineering, credential abuse, lateral movement, insider threats, and cloud-based attack scenarios - all tailored to your environment and risk profile.
You will receive regular monthly service reviews outlining activity, findings, and next steps. In addition, you’ll gain continuous visibility through campaign updates, validation reports, and strategic reviews throughout the programme.
Yes. One of the key benefits of CAS is continuous validation. Fixes can be retested during the programme, ensuring that remediation efforts are effective and that your organisation is becoming more resilient over time.
Dealing with a ransomware attack?
Our ransomware recovery service can help
Our expert team works quickly to contain the breach, recover your data, and restore your systems to full operation. We’ll guide you through every step of the recovery process and help strengthen your defences to prevent future attacks. Regain control with Zensec - trusted support when it matters most.