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Determine Response Strategy

Implementation Effort: Medium — Requires configuration of automated workflows, access controls, and integration with security operations tools.

User Impact: Low — Response strategies are implemented by administrators and security teams; no direct user interaction is required.

Overview​

Determining a response strategy in Microsoft Defender for Storage involves planning and implementing automated actions to contain and remediate threats detected through malware scanning and other security signals. A well-defined response strategy ensures that malicious files are handled quickly and securely, reducing the risk of data breaches and operational disruption.

Key Response Options​

  1. Block Access to Malicious or Unscanned Files
    Use Microsoft Entra Attribute-Based Access Control (ABAC) to restrict access to blobs based on malware scan results. This ensures only clean files are accessible to users and applications 1.

  2. Delete Malicious Files
    Automatically delete blobs flagged as malicious. It is recommended to enable soft delete on the storage account to allow recovery in case of false positives 1.

  3. Move to Quarantine
    Transfer malicious files to a dedicated container or storage account with restricted access. Use Microsoft Entra ID and RBAC to ensure only authorized personnel (e.g., SOC analysts) can access the quarantined data 1.

  4. Tag Files for Automation
    Apply Blob Index Tags to scanned files to label them as clean, malicious, or unscanned. These tags can trigger automated workflows or be used for filtering and reporting 1.

  5. Trigger Automated Workflows
    Use Event Grid events or Defender for Cloud alerts to initiate Logic Apps or other automation tools for incident response, such as notifying security teams or logging incidents 1.

Strategic Considerations​

  • Align response actions with your organization’s incident response plan.
  • Ensure integration with SIEM/SOAR platforms like Microsoft Sentinel.
  • Regularly test and update workflows to adapt to evolving threats.

Failing to define and implement a response strategy can result in delayed containment, increased exposure, and non-compliance with data protection policies.

This activity supports the Zero Trust principle of "Assume Breach" by ensuring threats are automatically contained and remediated based on real-time detection.

Reference​