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field-notes E15-security-event-monitoring.md

E15 · Woori FIS · Feb 2026 – Oct 2026

Alerts from many accounts on one screen

  • GuardDuty
  • Security Hub
  • Splunk
  • SIEM

Summary

I connected GuardDuty, Security Hub, and Splunk SIEM to monitor security events across multiple AWS accounts in one place.
Account AAccount BAccount CGuardDutyFinds threatsSecurity HubOne formatSplunk SIEMUnified monitoring
Every alert lands on one Splunk SIEM screen.

Background

  • GuardDuty: the AWS threat detection service. It finds threats such as unusual traffic or suspected credential theft.
  • Security Hub: collects results from several security services in one format.
  • SIEM: a system that gathers security logs from many systems for analysis. Here, that is Splunk.

What I did

I connected the three to monitor security events across multiple AWS accounts in one place.

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