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Cybersecurity Threat Hunter

Microsoft· Security Research
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Tokyo, Japan, Multiple Locations, Japanfull-timePosted 1w ago

About the role

Cybersecurity Threat Hunter in Microsoft's Detection and Response Team (DART) in Japan. Leads hypothesis-driven hunts, assesses adversary activity, and translates findings into actionable response actions and durable security improvements for customers.

Responsibilities

  • Set hunt objectives, hypotheses, priorities and evidence requirements using threat intelligence, adversary tactics, techniques and procedures, and customer-specific risk context.
  • Develop, test and refine hunts using large-scale correlation of endpoint, cloud, identity, network and third-party telemetry.
  • Operate as a platform- and vendor-agnostic hunter across Windows, Linux, macOS, multi-cloud and third-party technologies, using the telemetry, forensic artefacts and security tooling required by each customer environment.
  • Determine adversary presence, compromise scope and visibility gaps; establish what is known, what remains uncertain and what additional collection or analysis is needed.
  • Author and optimise queries, automation and responsible AI-enabled workflows to improve hunt scale, analytical quality and time to detection.
  • Convert investigations and research into durable detections, analytics, mitigations, threat intelligence and product or architectural improvements.
  • Lead multiple hunt workstreams during high-impact incidents, coordinate priorities and dependencies, maintain evidentiary documentation and support post-incident and root-cause analysis.
  • Brief customer technical teams, executives, internal stakeholders and partners with clear findings, coverage, limitations and response options.
  • Provide technical guidance, share research and mentor other hunters while protecting DART information, tools and operational security.

Qualifications

  • Doctorate in Statistics, Mathematics, Computer Science, Computer Security or related field OR Master's Degree in Statistics, Mathematics, Computer Science, Computer Security or related field AND experience in software development lifecycle, large-scale data analysis or security research; OR equivalent practical cybersecurity experience.
  • Demonstrated hands-on experience in threat hunting, Windows forensics, Linux or macOS analysis, or investigating identity-based attacks across Active Directory, Entra ID or other enterprise identity platforms.
  • Demonstrated experience authoring queries against large-scale security telemetry, including scripting or automation.
  • Ability to correlate and assess evidence from multiple sources, identify compromise scope, assess visibility gaps and clearly explain findings and uncertainty.
  • Strong customer-facing written and verbal communication, including executive briefings.
  • Flexibility to work non-standard business hours that may include evening, nighttime, weekends and/or holidays.
  • Business fluency in both Japanese and English.

Skills

Required:Threat huntingWindows forensicsLinux/macOS analysisQuerying/security telemetry automationcommunication
Nice to have:Kusto Query Language (KQL)leadership/mentorship
Last updated Oct 16, 2026. Interested? Apply on the company site.

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