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      <title>보안-03. Sigma 기초 — 룰 문법, logsource, detection 완전 분해</title>
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      <description>Sigma 룰의 모든 필드를 하나씩 분해. logsource의 3축(product/category/service), detection의 selection+modifier+condition, 상관관계(correlation) 기초.</description>
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      <title>보안-04. Sigma 심화 — pySigma, 백엔드, 파이프라인, 룰 작성 전략</title>
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      <description>pySigma 내부 구조(Backend/Pipeline/Transformation), 커스텀 백엔드 작성, 룰 품질 기준, 위협 헌팅과 기본 탐지의 차이, MITRE ATT&amp;amp;CK 커버리지 매핑 실전.</description>
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