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feat: Dual-signal SnortML (GID 411) + signature/EVE corroboration analytics for Cisco Secure Firewall #4220

Description

@AAH20

Is your feature request related to a problem? Please describe.

Cisco Secure Firewall Threat Defense analytics in ESCU already cover:

  • High EVE threat confidence (ML-ish encrypted path) as an intermediate finding
  • High-priority classic Snort intrusion classifications as stronger findings

Missing: an explicit SnortML (GeneratorID / GID 411) path that encodes the hard rule ML probability ≠ signature true positive, plus a signature + EVE corroboration analytic for dual-signal FIX_NOW-class triage.

Without that split, agentic / automated response consumers over-trust ML-only highs and under-train corroboration — inflating false containment.

Describe the solution you'd like

  1. Detection: Cisco Secure Firewall - SnortML High Confidence ML-Only
    • EventType=IntrusionEvent GeneratorID=411 (elevated Impact)
    • Type: Anomaly / intermediate finding (escalate/corroborate — not auto-contain)
  2. Detection: Cisco Secure Firewall - Signature Plus EVE Corroboration
    • Classic Snort (GeneratorID!=411) joined with ConnectionEvent EVE_ThreatConfidencePct >= 80
    • Type: TTP / higher finding score
  3. Companion attack_data samples for unit tests under
    datasets/cisco_secure_firewall_threat_defense/intrusion_event_snortml/ and .../dual_signal_corroboration/
  4. Attach both detections to analytic story Cisco Secure Firewall Threat Defense Analytics

Describe alternatives you've considered

  • Only tuning known_false_positives on High EVE — helpful but does not surface GID 411 as a first-class signal class.
  • Risk-rule-only correlation outside ESCU — weaker distribution to ES customers.

Additional context

CLA status: pending signature (will confirm in thread once completed).

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