Arun Dubey

Cyber Security Analyst

Talent

NorwichMember since August 10, 2026

Microsoft Sentinel (SIEM)Microsoft Defender (EDR)Firewall log analysisAuthentication/IAM log reviewTrue/false positive validationSeverity classificationLogin activity & user behaviour analysisEndpoint activity reviewIndicators of compromise (IOC)Evidence gatheringBasic vulnerability assessmentStructured case notesAudit-ready reportingEscalation of suspicious/confirmed findingsPlaybook/runbook-based proceduresShift handoverTCP/IPDNSHTTPFirewallsWindowsLinuxWindows Active DirectoryPythonPowerShellNIST CSFMITRE ATT&CKZero Trust principlesISO 27001ISMS

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Microsoft Sentinel (SIEM)Microsoft Defender (EDR)Firewall log analysisAuthentication/IAM log reviewTrue/false positive validation

About

Cyber Security Analyst who keeps escalations focused on genuine threats by triaging 200-300 Microsoft Sentinel (SIEM) and Defender (EDR) alerts weekly, strengthens Zero Trust posture through Active Directory administration, and delivers audit-ready reporting by applying NIST CSF and MITRE ATT&CK to every investigation, escalation and compliance activity.

Certified Ethical

Hacker (CEH), currently pursuing Microsoft SC-200 and CompTIA Security+, with a postgraduate degree in Business Analytics and Management including a strategic cybersecurity in business module, and scripting in Python and PowerShell.

Experience

Cyber Security Analyst - YMCA Norfolk - Norwich, United Kingdom

(2025-01)

Volunteer, shift-based. Originally a UEA-sponsored placement on YMCA's live infrastructure; continued voluntarily since.

Kept escalations focused on genuine threats by triaging 200–300 SIEM/EDR alerts weekly and validating false positives.
Closed a key access-control gap by driving MFA and YubiKey adoption through risk findings presented to leadership.
Reduced shift‑handover time to 30-45 minutes by standardising case documentation, ensuring continuity.
Ensured accurate escalation by reviewing automated conditional-access blocks on repeated failed sign-ins.
Prevented rushed reviews on an ~80/20 triage split, prioritising unusual logins and device non-compliance.
Strengthened Zero Trust posture by administering and securing access across 200 Active Directory accounts.
Delivered audit-ready reporting by gathering evidence and documenting escalated findings per NIST CSF.

Cybercrime & Financial Fraud Support - Gurgaon Police - Haryana, India

(2021-06 - 2023-03)

Volunteer

Traced digital evidence across offence types while investigating 90–100 cybercrime and financial-fraud cases.
Resolved most cases through persistent, structured follow-up with complainants and investigating officers.
Documented findings and investigation steps to support case development, decision-making and audit trails.
Maintained secure handling of sensitive data in line with legal, regulatory and confidentiality requirements.
Kept complainants and officers informed with clear updates, scaling engagement on complex cases.

Software Support Associate - Aithent Technologies - Gurgaon, India

(2019-11 - 2023-07)

Resolved 30+ daily tickets for 90+ US public-sector sites, consistently meeting SLA targets.
Caught issues pre-deployment through functional testing, defect reproduction and fix validation.
Sustained SLA performance through peak volume with same-day resolution on most cases.
Improved client experience across sites by resolving significant software performance issues at role start.
Reduced repeat tickets by creating technical documentation that improved team knowledge transfer.