Cyber Resilience Experts

Proactive defence, proven protection

Our mission is to hunt down any vulnerabilities before attackers get the chance to exploit them and strip out the guesswork, while giving you full control of your security posture.  No noise. No delays. Just ruthless precision against risk.

Get your free take home actions PDF below, based on published research by the National Security Agency (NSA) and Cybersecurity and Infrastructure Security Agency (CISA).


Our Cyber Security Services

Below we have described our service features for your review and consideration, please get in touch with any questions!

Prepare

A well-prepared organization can detect risks early, respond faster, and recover stronger, giving you the confidence to grow and operate securely in an increasingly connected world.

Prepare

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Manage

Proactive cyber security management reduces risk, prevents costly breaches, and safeguards your reputation in a connected world.

Manage

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Recover

Effective cyber security recovery ensures business continuity, reduces downtime, and helps you bounce back stronger after a breach or disruption.

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About A4S

We’re a team of cyber resilience specialists focused on helping clients proactively defend their environments against IT security threats.

We find what others miss, and fast.

We deliver continuous, intelligence-driven visibility into your assets and exposures, prioritising what matters, eliminating false positives, and accelerating time-to-remediation. Our approach transforms vulnerability management from a reactive checkbox into a proactive shield. Whether you’re defending complex hybrid environments or scaling security across growing teams, we empower you to act decisively, stay compliant, and reduce risk with confidence.

Securing Cloud Environments with Microsoft Defender Suite

Our organization delivers robust and comprehensive cloud security by leveraging the full power of the Microsoft Defender suite, a leading solution in cloud-native security. Our expertise spans across multi-cloud and hybrid environments, ensuring continuous protection, visibility, and compliance.

We utilize Microsoft Defender to provide:

  • Cloud Workload Protection: Through Microsoft Defender for Cloud, we secure virtual machines, containers, databases, and serverless functions across Azure, AWS, and GCP. Our approach ensures real-time threat detection and automated remediation.

  • Identity and Access Security: With Microsoft Defender for Identity and Defender for Endpoint, we protect against identity-based threats and lateral movement. We detect compromised credentials and suspicious activities, reinforcing zero-trust principles across cloud infrastructure.

  • Advanced Threat Detection & Response: Leveraging Microsoft Defender XDR, we correlate signals across endpoints, identities, email, and cloud workloads. This enables our security teams to detect sophisticated threats, reduce alert fatigue, and accelerate incident response.

  • Secure Posture Management: We implement continuous security assessments, utilizing Microsoft Defender for Cloud’s Secure Score to proactively reduce risk, enforce best practices, and maintain compliance with industry standards such as CIS, NIST, and ISO.

  • Integrated DevSecOps: Our team integrates security into the development pipeline with Defender for DevOps, identifying vulnerabilities in code and configurations before deployment.

By aligning with Microsoft’s best practices and fully utilizing the Defender suite’s automation and AI-driven insights, we empower organizations to stay ahead of evolving threats and maintain resilient, compliant, and secure cloud environments.

As a trusted Tenable Partner, we bring advanced capabilities in vulnerability management, exposure reduction, and cyber risk visibility to our clients. Tenable, the creator of Nessus and the leader in Cyber Exposure Management, enables us to help organizations move beyond traditional vulnerability scanning toward a more proactive, risk-based approach to security.

By partnering with Tenable, we offer the following benefits:

  • Risk-Based Vulnerability Management: We prioritize vulnerabilities not just by severity, but by real-world exploitability and business context—helping organizations focus on what matters most using Tenable Vulnerability Management (formerly Tenable.io) and Tenable Security Center.

  • Complete Asset Visibility: Our partnership enables us to provide comprehensive visibility into all assets—cloud, on-premises, containers, and operational technology (OT). This ensures no blind spots in your environment, reducing attack surfaces effectively.

  • Cloud Security Posture Insights: With Tenable Cloud Security (formerly Tenable.cs), we help secure cloud-native applications, infrastructure as code (IaC), and misconfigurations across multi-cloud environments, enhancing your compliance and DevSecOps posture.

  • Continuous Monitoring & Compliance: We offer continuous scanning and reporting to ensure compliance with regulatory frameworks like PCI DSS, HIPAA, NIST, ISO 27001, and CIS Benchmarks, supported by Tenable’s robust compliance toolsets.

  • Strategic Risk Reduction: Using Tenable One, the unified exposure management platform, we correlate vulnerabilities, misconfigurations, and identity risks across the entire environment, delivering a clear, quantifiable view of cyber risk that aligns security with business objectives.

  • Accelerated Response & Remediation: Our certified experts interpret Tenable insights and integrate them with existing SIEM/SOAR workflows to drive efficient, automated remediation and minimize mean time to response (MTTR).

Being a Tenable Partner amplifies our commitment to delivering proactive, scalable, and risk-driven cybersecurity solutions, helping our clients not just detect threats, but anticipate and prevent them.

In today’s evolving threat landscape, reactive security is no longer sufficient. Our approach to cyber resilience is built on proactive and preventative strategies designed to anticipate threats, minimize risk, and ensure business continuity—even in the face of sophisticated cyberattacks.

We focus on building resilience by design, integrating security into every layer of technology, process, and culture. Our methodology includes:

  • Threat Anticipation & Intelligence-Driven Defense:  We leverage threat intelligence, behavioral analytics, and attack surface management to stay ahead of emerging threats. Our use of advanced tools like Microsoft Defender and Tenable enables us to continuously assess vulnerabilities and proactively harden environments before they are exploited.
  • Prevention Through Zero Trust Architecture: We implement Zero Trust principles to ensure that access is never assumed and always verified. By controlling identity, device, and network access, we reduce the opportunity for lateral movement and internal compromise.
  • Automated Risk Reduction:  We employ automation to continuously scan for misconfigurations, exposed assets, and unpatched vulnerabilities. This allows us to prioritize and remediate risks faster, using platforms like Tenable for exposure management and Microsoft Defender for automated protection and response.
  • Integrated Security Across Cloud and Hybrid Environments:  Cyber resilience requires visibility and control across your entire digital estate. We integrate security into cloud workloads, endpoints, and applications—detecting and preventing threats before they disrupt operations.
  • Security Awareness & Human Layer Defense:  Recognizing that human error remains a top attack vector, we include user education, phishing simulations, and policy enforcement as part of our prevention-first mindset. A well-informed workforce is a critical line of defense.
  • Continuous Monitoring & Adaptive Defense:  We deliver 24/7 monitoring and real-time threat detection through integrated SIEM/XDR solutions. Our team adapts controls based on evolving risks, ensuring sustained protection and rapid recovery capabilities.

By combining cutting-edge technologies, proven frameworks, and expert guidance, we help organizations move from reactive security to a proactive, preventative posture—building resilience not just against today’s threats, but tomorrow’s unknowns.

We provide end-to-end services for cloud migration to Microsoft Azure and Microsoft 365, enabling organizations to transition securely and efficiently. Our approach begins with a thorough assessment of your current infrastructure, followed by the design and implementation of a tailored migration strategy. Whether you’re moving workloads to Azure or transitioning to Microsoft 365 for productivity and collaboration, we ensure minimal disruption and full alignment with your business and compliance requirements. Our experts manage the entire migration process—including identity integration, data transfer, application modernization, and testing—ensuring a seamless shift to the Microsoft cloud ecosystem.

Post-migration, we deliver comprehensive cloud management, governance, and support across Azure and Microsoft 365. This includes proactive performance monitoring, cost optimization, security hardening, and compliance enforcement aligned with Microsoft’s best practices and your regulatory requirements. We implement governance frameworks using tools like Azure Policy and Microsoft Purview to maintain control and visibility. Our 24/7 support ensures rapid issue resolution, while our managed services help you continuously optimize and scale your cloud environment. With our expertise, you gain a secure, resilient, and future-ready Microsoft cloud foundation.

Why Care About Cyber Resilience?

0%
Of business have experienced a serious cyber security breach or attack in the past 12 months, and almost half are still suffering the impact.
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Cyber attacks are costing UK businesses £64 billion a year in ransom payments, staff overtime, lost business, and other associated costs.
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In 2023-24, UK businesses experienced approximately 7.78 million cybercrimes, which translates to an average of 21,315 attacks PER DAY!
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Of businesses experienced a successful phishing attack in 2023, exploiting user behavior and weak attack surfaces.

Case studies

A4S Cyber Blog

What Our Customers Think