anti
1ad15470a1
8 YAMLs for the email cohort per Appendix B: open-relay abuse, mass phishing, phishing-kit X-Mailer signatures, IDN/punycode URLs, sender masquerade, malicious attachment, BEC, encoded payload in body. EmailLifter (E.3.12) consumes by rule_id. test_email_rules.py: YAML-present + inert-in-v0 + xfail(strict) precision case gated on E.3.12.
25 lines
522 B
YAML
25 lines
522 B
YAML
rule_id: R0041
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rule_version: 1
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name: open_relay_abuse
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description: |
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High RCPT count with a foreign From — abuse of an open relay to
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push outbound mail. EmailLifter (E.3.12).
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applies_to:
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- email
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match:
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kind: lifter:open_relay
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rcpt_threshold: 10
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require_foreign_from: true
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emits:
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- tactic: TA0040
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technique_id: T1496
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confidence: 0.85
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- tactic: TA0042
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technique_id: T1586
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sub_technique_id: T1586.002
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confidence: 0.85
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evidence_fields:
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- rcpt_count
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- from_domain
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- mail_from_domain
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