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Workflow Template: File Prevalence Check on MS Defender for Endpoint

Checks whether a file (by SHA1 hash) is widely distributed across the org before allowing automated remediation.

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The "File Prevalence Check on MS Defender for Endpoint" workflow template is designed for threat hunting by assessing the distribution of a file within an organization using its SHA1 hash. It fetches file statistics and evaluates the organization's prevalence against predefined thresholds to determine the risk level. The workflow outputs a JSON risk assessment, guiding whether to halt, review, or proceed with automated remediation based on the file's prevalence.

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Use Cases

Threat Hunting

Workflow Breakdown

  1. Fetch org + global file statistics by file's SHA1 hash.

  2. Evaluate orgPrevalence against HIGH / MEDIUM / LOW thresholds.

  3. Output risk assessment JSON

Vendors

Utils, Microsoft Defender for Endpoint

Workflow Output

JSON risk assessment with a verdict: HIGH (> High Prevalence Threshold): hard stop, do not remediate. MEDIUM (Low–High Prevalence Threshold): soft stop, analyst review required. LOW (< Low Prevalence Threshold): cleared for automated remediation.

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