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Rule Logic Design

Designing the logic of a detection rule, the conditions, thresholds, joins, and exclusions, so it accurately flags malicious activity with manageable false positives and stable behavior over time.

Rule-logic design is the craft of writing the actual conditions inside a detection: which fields, what comparisons, which time windows, what exclusions, how multiple conditions combine. Good logic balances sensitivity, specificity, and maintainability, catches the threat reliably, avoids false positives, and doesn't break when fields or behavior shift slightly. It is a core detection-engineering skill where small choices have big effects on detection quality and analyst load.

Introduced in: Detection Engineering

Examples

  • Choosing the right time window for a correlation rule.
  • Adding exclusions to remove a noisy benign case while keeping coverage.
  • Combining conditions so the rule is sensitive without being noisy.
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