Detection Triage & Evidence-Based Incident Investigation
Investigating identity and endpoint alerts through repeatable evidence collection and corroboration.
This retrospective describes professional responsibilities at a high level. Organization-specific data, policy names, hostnames, identities, sensitive configuration details, and internal records are deliberately excluded. The description does not claim a completed enterprise-wide rollout unless documented.
Engineering problem
Security alerts involving new sign-in locations, anomalous authentication patterns, privileged group changes, and suspicious mailbox activity require contextual validation before an incident can be closed or escalated.
Methodology
- Reviewed relevant sign-in and audit activity, correlated timestamps and affected entities, and queried related events using KQL where available.
- Cross-checked security signals against administrative change windows, known activity, or user confirmation before classifying a finding.
- Documented concise resolution notes and distinguished supported benign findings from unresolved or higher-risk activity.
Documented outcome
Supported evidence-based triage and clear disposition documentation across multiple Sentinel alert categories. No incident count, false-positive reduction, or MTTR improvement is stated without verified reporting.
Technical themes
Microsoft SentinelDefenderKQL