docs: Behavioral detection patterns and .mtd in suppression keys#95
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docs: Behavioral detection patterns and .mtd in suppression keys#95
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Document the suppression-based behavioral detection capabilities that exist in the D&R engine, including first-seen detection, cardinality thresholds, volume thresholds, and multi-signal aggregation. Also documents the new .mtd namespace in suppression key templates (from refractionPOINT/dr-engine#217) which allows lookup-derived values like GeoIP country to be used in suppression keys. This enables single-rule first-seen detection patterns such as "first time user logs in from a new country." Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
lcbill
approved these changes
Feb 22, 2026
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Summary
3-detection-response/behavioral-detection.md) documenting suppression-based detection patterns.mtdnamespace in suppression key templatesmkdocs.ymlNew Page: Behavioral Detection
Documents four detection patterns that work using existing D&R rules and suppression:
max_count: 1suppression as a first-seen detector, with examples for event fields (new domain, new process hash, new login source) and lookup-derived values (GeoIP country, ASN, threat intel category via.mtd)count_pathfor cumulative metric thresholds (data exfiltration)Includes parameter reference table, template namespace documentation, and a clear limitations section.
Updated: Response Actions
Added to the suppression section:
keys:.event.*,.routing.*,.mtd.*Dependency
The
.mtdnamespace in suppression keys depends on refractionPOINT/dr-engine#217.Test plan
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