Senior Threat Behavior Researcher UK

About Us

Sophos is a global leader and innovator of advanced security solutions for defeating cyberattacks. The company acquired Secureworks in February 2025, bringing together two pioneers that have redefined the cybersecurity industry with their innovative, native AI-optimized services, technologies and products. Sophos is now the largest pure-play Managed Detection and Response (MDR) provider, supporting more than 28,000 organizations. In addition to MDR and other services, Sophos ’ complete portfolio includes industry-leading endpoint, network, email, and cloud security that interoperate and adapt to defend through the Sophos Central platform. Secureworks provides the innovative, market-leading Taegis XDR/MDR, identity threat detection and response (ITDR), next-gen SIEM capabilities, managed risk, and a comprehensive set of advisory services. Sophos sells all these solutions through reseller partners, Managed Service Providers (MSPs) and Managed Security Service Providers (MSSPs) worldwide, defending more than 600,000 organizations worldwide from phishing, ransomware, data theft, other every day and state-sponsored cybercrimes. The solutions are powered by historical and real-time threat intelligence from Sophos X-Ops and the newly added Counter Threat Unit (CTU). Sophos is headquartered in Oxford, U.K. More information is available at www.sophos.com.

Role Summary

What You Will Do

• Conduct in-depth behavioral analysis of Windows threats.
• Develop Behavioral rules for various threat behaviors including hands-on keyboard attack, malware payloads, initial attack vectors and Advanced Persistent Threats (APTs).
• Produce quality threat analysis reports for both internal and external audience.
• Assist in sandbox improvements by analyzing malware that hinders the sandbox environment in running the threat, which deploys various anti-analysis techniques.
• Develop Cleanup rules to remove artifacts that are left behind by the behavioral protection rules.
• Collaborate with other cross-functional teams to improve behavioral protection capability based on the threat analysis.
• Guide and train junior team members in assisting malware analysis, peer code review.
• Assist in the development of tools wherever necessary to improve day-to-day task.

What You Will Bring

• Strong knowledge of Windows Internals including Memory management, Processes, Threads.
• Proficiency in both static and dynamic analysis of threats, using tools such as IDAPro, WinDbg.
• Demonstrated programming experience. Preferred: Python, Lua.
• Excellent communication skills with the ability to demonstrate complex technical problem to peer researchers as well as to product engineering team.
• Excellent analytical and problem-solving skills with the ability to think strategically and creatively.
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