Fixing Incident Correlation Issues After Migrating Sentinel to Defender XDR

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After migrating Sentinel to the unified Defender portal, you may encounter incident correlation gaps. This article will guide you on how to fix these issues by auditing analytics rules, verifying data connectors, testing incident correlation with synthetic alerts, and adjusting fusion rules for the unified portal.

Incident Correlation in Unified Defender Portal

The unified Defender portal brings together various security solutions under one roof. However, this change can lead to incident correlation issues after Sentinel migration. The portal groups incidents based on similarities in their attributes, such as IP addresses, domains, and hashes.

Common Correlation Gaps

After migration, incident correlations may not function correctly due to various reasons. These could include missing or misconfigured data connectors, incorrect analytics rules, or discrepancies in the data sources.

Adjusting Analytics Rules

To ensure seamless incident correlation in the unified portal, review and adjust your analytics rules accordingly. Modify them to account for differences in the new environment.

Verifying Data Connectors

Ensure all data connectors are active after migration. Inactive connectors can lead to missing or inconsistent data, affecting incident correlation.

Using Advanced Hunting

Test your incident correlation by creating synthetic alerts and validating incident data using Advanced Hunting queries in Defender XDR. This approach helps you verify if the incidents are being correctly correlated.

Conclusion

Migrating Sentinel to Defender portal can lead to incident correlation issues. To fix these, audit analytics rules, verify data connectors, test incident correlation with synthetic alerts, and adjust fusion rules to account for the unified portal. Learn more about Microsoft Cloud Security Training from ITP Training.

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