September 2026
Intermediate
490 pages
16h 10m
French
Content preview from Guide de la « Blue Team » : SOC, SIEM et chasse aux menaces (French Edition)
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Chapitre 19. Security Onion
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« Le NSM est un moyen de détecter les intrus sur ton réseau et de prendre des mesures avant qu’ils ne causent du tort à ton entreprise. »
Richard Bejtlich, The Practice of Network Security Monitoring (No Starch Press, 2013)
Les centres d’opérations de sécurité s’appuient sur des plateformes capables de traiter d’énormes quantités de données télémétriques brutes pour les transformer en informations exploitables par un analyste. Les plateformes SIEM modernes excellent dans ce domaine : elles collectent les journaux de toute l’entreprise, les normalisent, les corréler et les rendent consultables de manière à révéler des schémas, des relations et des chronologies qui, sans ça, resteraient cachés.
Un SIEM bien conçu permet à un analyste de répondre à des questions telles que :
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Quels enregistrements de journaux contiennent un nom de compte, une URL, un domaine ou une adresse IP en particulier ?
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Quelle activité a été générée à partir d’un segment de réseau spécifique pendant une période donnée ?
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Quels changements de configuration ont eu lieu sur une plateforme SaaS ou chez un fournisseur d’identité Cloud, et que s’est-il passé d’autre dans l’environnement à peu près au même moment ?
Ces plateformes sont spécialement conçues pour collecter, stocker, enrichir et présenter les données de télémétrie de manière à transformer ...
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