
Email Security SME
1 week ago
Level: L3
Lead the investigation of high and critical severity email security incidents flagged by Microsoft Defender for Office 365 (MDO).
Correlate alerts across Defender XDR (including Defender for Endpoint, Identity, and Cloud Apps) to build a complete incident storyline.
Use automated investigation and response (AIR) playbooks to identify impacted entities and take containment actions such as:
- Soft-deleting malicious emails.
- Removing suspicious inbox rules.
- Blocking sender domains or URLs
Perform forensic analysis of phishing, spoofing, and business email compromise (BEC) attacks.
Document root cause analysis (RCA) and lessons learned for each incident
Identify gaps in detection logic and recommend improvements to SIEM and SOAR teams.
Support in Providing recommendation for fine-tuning MDO policies such as anti-phishing, anti-spam, and safe links/safe attachments.
Collaborate with Microsoft Premier Support for platform-level bugs or advanced troubleshooting
Engage with the Microsoft DART team when sanctioned by the customer for deep-dive investigations
Update incident status in ServiceNow tool and ensure timely communication with stakeholders
Participate in CSIRT bridges and coordinate with customer Cyber Defense teams and Rapid Response Teams (RRTs)
Contribute to weekly/monthly dashboards and SLA/KPI reporting
Implement learnings from past incidents to prevent recurrence
Participate in quarterly tuning sessions and transformation workshops
Tool / Technology: Microsoft Defender for Office
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