{"id":6381684,"date":"2025-01-22T18:04:29","date_gmt":"2025-01-22T18:04:29","guid":{"rendered":"https:\/\/www.oodrive.com\/?p=6381684"},"modified":"2025-01-22T18:04:00","modified_gmt":"2025-01-22T18:04:00","slug":"systeme-siem","status":"publish","type":"post","link":"https:\/\/www.oodrive.com\/fr\/blog\/securite\/cybersecurite\/systeme-siem\/","title":{"rendered":"Le SIEM, outil essentiel des strat\u00e9gies de cybers\u00e9curit\u00e9 modernes"},"content":{"rendered":"\n<div class=\"wp-block-jet-engine-section jet-section wp-block-jet-engine-section jet-section--layout-fullwidth has-grey-success-2-background-color\"><div class=\"jet-section__content\">\n<h2 class=\"wp-block-heading\"><strong>R\u00e9sum\u00e9 de l&rsquo;article<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Un SIEM (Security Information and Event Management) est un outil de cybers\u00e9curit\u00e9. Il collecte et analyse des logs et des donn\u00e9es provenant de multiples sources, afin de d\u00e9tecter et bloquer les menaces en temps r\u00e9el.<\/li>\n\n\n\n<li>Cet outil fonctionne en corr\u00e9lant des \u00e9v\u00e9nements issus de diff\u00e9rents syst\u00e8mes, ce qui lui permet d\u2019identifier d\u2019\u00e9ventuels comportements anormaux. Il alerte les \u00e9quipes de s\u00e9curit\u00e9 (les analystes SOC, notamment), voire bloque automatiquement les activit\u00e9s consid\u00e9r\u00e9es comme suspectes.<\/li>\n\n\n\n<li>Les syst\u00e8mes SIEM modernes int\u00e8grent d\u00e9sormais l\u2019IA pour r\u00e9pondre de mani\u00e8re encore plus efficace aux cybermenaces.<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p>Les strat\u00e9gies de cybers\u00e9curit\u00e9 des organisations se sont profond\u00e9ment transform\u00e9es en l\u2019espace de quelques ann\u00e9es. Les professionnels de la s\u00e9curit\u00e9 ont d\u00e9sormais besoin d\u2019outils de cybers\u00e9curit\u00e9 puissants pour prot\u00e9ger leur syst\u00e8me d\u2019information et \u00e9viter les fuites de donn\u00e9es. Le SIEM est justement l\u2019un de ces outils. En analysant de grandes quantit\u00e9s de donn\u00e9es, un SIEM peut d\u00e9tecter et bloquer d\u2019\u00e9ventuelles menaces avant qu\u2019elles n\u2019impactent le fonctionnement du SI et ne perturbent l\u2019activit\u00e9.<\/p>\n\n\n\n<p>Quel est le r\u00f4le pr\u00e9cis d\u2019un SIEM\u00a0? Comment fonctionne-t-il et comment le mettre en place ? Quels sont les avantages d\u2019un SIEM\u00a0? <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Qu\u2019est-ce qu\u2019un SIEM&nbsp;?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">SIEM&nbsp;: d\u00e9finition<\/h3>\n\n\n\n<p>Un SIEM (pour \u00ab&nbsp;Security Information and Event Management&nbsp;\u00bb) est une solution de cybers\u00e9curit\u00e9 qui permet aux organisations de d\u00e9tecter les menaces cyber en temps r\u00e9el (notamment gr\u00e2ce \u00e0 l\u2019analyse de logs) et de les bloquer. On parle \u00e9galement de \u00ab&nbsp;syst\u00e8me de gestion des informations et des \u00e9v\u00e9nements de s\u00e9curit\u00e9&nbsp;\u00bb.<\/p>\n\n\n\n<p>Introduit par l&rsquo;Institut Gartner en 2005, le SIEM combine la gestion des informations de s\u00e9curit\u00e9 (SIM) et la gestion des \u00e9v\u00e9nements de s\u00e9curit\u00e9 (SEM) au sein d&rsquo;un m\u00eame syst\u00e8me. Il s&rsquo;est impos\u00e9 comme un outil indispensable aux <a href=\"https:\/\/www.oodrive.com\/fr\/blog\/actualites\/tendances-it-2025\/\">organisations IT<\/a> soucieuses de prot\u00e9ger leurs donn\u00e9es sensibles face \u00e0 des cybermenaces de plus en plus sophistiqu\u00e9es.<\/p>\n\n\n\n<p>Cette technologie s\u2019est consid\u00e9rablement renforc\u00e9e avec l\u2019int\u00e9gration de l\u2019IA, qui rend la d\u00e9tection des menaces et la r\u00e9ponse aux incidents \u00e0 la fois plus intelligentes et plus rapides. Dans sa version moderne, le SIEM offre aux organisations une visibilit\u00e9 compl\u00e8te sur l&rsquo;activit\u00e9 de leur r\u00e9seau. Elles peuvent ainsi r\u00e9agir rapidement aux cyberattaques potentielles et assurer leur conformit\u00e9 r\u00e9glementaire.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Quelle est la diff\u00e9rence entre SIEM et SOC&nbsp;?<\/h3>\n\n\n\n<p>Un SIEM est une solution technologique qui fournit aux analystes du SOC (Security Operations Center) des informations consolid\u00e9es issues de l&rsquo;analyse des \u00e9v\u00e9nements. Ces donn\u00e9es sont trop volumineuses pour \u00eatre analys\u00e9es manuellement par les \u00e9quipes SOC.<\/p>\n\n\n\n<p>Le SOC est une \u00e9quipe d\u00e9di\u00e9e \u00e0 la surveillance des menaces et \u00e0 la gestion des op\u00e9rations de s\u00e9curit\u00e9. Le SIEM est un outil indispensable pour permettre au SOC d\u2019accomplir sa mission\u00a0: g\u00e9rer les menaces cyber, maintenir une visibilit\u00e9 sur la s\u00e9curit\u00e9 de l\u2019organisation et r\u00e9agir aux potentielles attaques (r\u00e9ponse aux incidents de s\u00e9curit\u00e9).<\/p>\n\n\n\n<section class=\"product__section\" id=\"work-banner\"><div class=\"product__section-container\"><p class=\"product__section-title\">La collaboration s\u00e9curis\u00e9e<\/p><p class=\"product__section-description\">Partagez, modifiez et annotez vos contenus sensibles dans un environnement s\u00e9curis\u00e9.<\/p><img decoding=\"async\" src=\"..\/..\/..\/..\/wp-content\/plugins\/oodrive-blog-banners\/src\/img\/bg-banner_work.svg\" class=\"product__section-bg\"\/><\/div><div class=\"product__section-link\"><img decoding=\"async\" src=\"..\/..\/..\/..\/wp-content\/plugins\/oodrive-blog-banners\/src\/img\/logo-work-black-color.svg\" class=\"product__section-logo\" alt=\"oodrive work\"\/><div class=\"cta\"><a href=\"https:\/\/www.oodrive.com\/fr\/produits\/oodrive-work\/\">En savoir plus<\/a><\/div><\/div><\/section>\n\n\n\n<h2 class=\"wp-block-heading\">Comment fonctionne un SIEM&nbsp;? Les principales fonctionnalit\u00e9s<\/h2>\n\n\n\n<p>Un syst\u00e8me SIEM collecte les journaux d\u2019\u00e9v\u00e9nements et diverses donn\u00e9es \u00e0 partir de multiples sources. Il identifie les activit\u00e9s qui s&rsquo;\u00e9cartent de la norme \u00e0 travers \u00e0 une analyse en temps r\u00e9el, et applique ensuite les mesures de s\u00e9curit\u00e9 appropri\u00e9es. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Collecte de donn\u00e9es<\/h3>\n\n\n\n<p>Un SIEM collecte, centralise et organise de grandes quantit\u00e9s de donn\u00e9es provenant de multiples sources au sein de l&rsquo;infrastructure r\u00e9seau d&rsquo;une organisation, notamment&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Les p\u00e9riph\u00e9riques r\u00e9seau (routeurs, commutateurs, bridges, points d&rsquo;acc\u00e8s sans fil, modems),<\/li>\n\n\n\n<li>Les serveurs (web, proxy, messagerie, FTP),<\/li>\n\n\n\n<li>Les dispositifs de s\u00e9curit\u00e9 (IDP\/IPS, pare-feux, logiciels antivirus, dispositifs de filtrage de contenu),<\/li>\n\n\n\n<li>Les applications install\u00e9es sur ces dispositifs.<\/li>\n<\/ul>\n\n\n\n<p>Le SIEM est ainsi un outil compl\u00e9mentaire \u00e0 un outil de <a href=\"https:\/\/www.oodrive.com\/fr\/produits\/oodrive-work\/\">collaboration en ligne s\u00e9curis\u00e9e<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Analyse de logs et corr\u00e9lation entre les \u00e9v\u00e9nements<\/h3>\n\n\n\n<p>Le SIEM examine en permanence diff\u00e9rents attributs du r\u00e9seau (activit\u00e9s des utilisateurs, \u00e9v\u00e9nements syst\u00e8me, adresses IP, etc.), \u00e0 la recherche de potentielles activit\u00e9s inhabituelles. Il doit d\u00e9terminer si les donn\u00e9es collect\u00e9es pr\u00e9sentent des signes de menace, d\u2019attaque ou de violation.<\/p>\n\n\n\n<p>Lorsqu&rsquo;il d\u00e9tecte des comportements anormaux, le syst\u00e8me SIEM les classe dans des cat\u00e9gories sp\u00e9cifiques&nbsp;: \u00e9checs de connexion r\u00e9p\u00e9t\u00e9s, modifications de comptes ou encore pr\u00e9sence de logiciels potentiellement malveillants. La corr\u00e9lation entre diff\u00e9rentes donn\u00e9es permet d\u2019identifier des comportements qui auraient pu passer inaper\u00e7us s\u2019ils avaient \u00e9t\u00e9 analys\u00e9s seuls.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Surveillance et r\u00e9ponse aux incidents<\/h3>\n\n\n\n<p>Les \u00e9quipes de s\u00e9curit\u00e9 configurent des alertes et d\u00e9finissent les r\u00e9ponses appropri\u00e9es. Le syst\u00e8me peut alerter les analystes en cas d\u2019incident, ou m\u00eame stopper automatiquement une activit\u00e9 qui aura \u00e9t\u00e9 qualifi\u00e9e de \u00ab&nbsp;suspecte&nbsp;\u00bb.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Quels sont les avantages d\u2019un syst\u00e8me SIEM&nbsp;?<\/h2>\n\n\n\n<p>La mise en place d\u2019un SIEM pr\u00e9sente diff\u00e9rents types d\u2019avantages en mati\u00e8re de visibilit\u00e9, de protection des donn\u00e9es et de conformit\u00e9.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Visibilit\u00e9 compl\u00e8te et d\u00e9tection am\u00e9lior\u00e9e<\/h3>\n\n\n\n<p>L&rsquo;un des principaux avantages d\u2019un outil SIEM est d&rsquo;offrir une vue centralis\u00e9e des menaces pesant sur l\u2019environnement IT d\u2019une organisation. Cette visibilit\u00e9 permet aux \u00e9quipes de d\u00e9tecter, identifier et r\u00e9pondre aux menaces en temps r\u00e9el gr\u00e2ce \u00e0 l\u2019analyse et la corr\u00e9lation de donn\u00e9es issues de multiples sources. La surveillance des utilisateurs, des applications et des appareils effectu\u00e9e par le SIEM est plus transparente et plus efficace.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Protection des donn\u00e9es sensibles et pr\u00e9vention des fuites de donn\u00e9es<\/h3>\n\n\n\n<p>Le SIEM constitue un dispositif essentiel pour prot\u00e9ger les donn\u00e9es sensibles des <a href=\"https:\/\/www.oodrive.com\/fr\/blog\/productivite\/fuite-de-donnees\/#:~:text=Qu'est%2Dce%20qu',non%20autoris%C3%A9e%20%C3%A0%20des%20tiers.\">fuites de donn\u00e9es<\/a>, puisqu\u2019il surveille en continu les acc\u00e8s aux syst\u00e8mes et aux donn\u00e9es sensibles. Il peut identifier d\u2019\u00e9ventuels comportements suspects et anomalies, d\u00e9tectant ainsi rapidement les tentatives d\u2019acc\u00e8s non autoris\u00e9s aux donn\u00e9es. Le SIEM permet \u00e9galement de g\u00e9n\u00e9rer des alertes en cas de transferts de donn\u00e9es inhabituels.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Conformit\u00e9 renforc\u00e9e<\/h3>\n\n\n\n<p>La mise en place d\u2019un SIEM facilite le respect des diff\u00e9rentes r\u00e9glementations en mati\u00e8re de protection des donn\u00e9es (<a href=\"https:\/\/www.oodrive.com\/fr\/blog\/reglementation\/cloud-act-rgpd-impacts-protection-donnees\/\">RGPD<\/a>, HIPAA, PCI DSS, etc.), puisqu\u2019un syst\u00e8me SIEM fournit\u00a0:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Des rapports d\u00e9taill\u00e9s sur les \u00e9v\u00e9nements de s\u00e9curit\u00e9,<\/li>\n\n\n\n<li>Des preuves d&rsquo;audit pour d\u00e9montrer la conformit\u00e9,<\/li>\n\n\n\n<li>Une tra\u00e7abilit\u00e9 compl\u00e8te des acc\u00e8s aux donn\u00e9es gr\u00e2ce \u00e0 la conservation des logs.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Comment mettre en place un SIEM&nbsp;? Les bonnes pratiques<\/h2>\n\n\n\n<p>Pour \u00eatre r\u00e9ellement efficace, la mise en place d\u2019un SIEM n\u00e9cessite une approche m\u00e9thodique. L\u2019identification des sources de donn\u00e9es constitue une \u00e9tape cl\u00e9. Elle doit s\u2019accompagner d\u2019une \u00e9valuation des besoins en ressources et en expertise.<\/p>\n\n\n\n<p>Lors du d\u00e9ploiement du SIEM, l\u2019organisation doit&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>S\u00e9lectionner les sources de logs prioritaires.<\/li>\n\n\n\n<li>Configurer des r\u00e8gles de corr\u00e9lation appropri\u00e9es.<\/li>\n\n\n\n<li>D\u00e9finir et mettre en place des proc\u00e9dures de d\u00e9tection des activit\u00e9s suspectes.<\/li>\n\n\n\n<li>B\u00e2tir un plan de r\u00e9ponse aux incidents.<\/li>\n<\/ul>\n\n\n\n<p>Une organisation souhaitant mettre en place un SIEM doit \u00e9galement prendre en compte ses obligations en mati\u00e8re de conformit\u00e9. Une fois d\u00e9ploy\u00e9, un syst\u00e8me SIEM fonctionne en s\u2019appuyant sur des \u00e9quipes form\u00e9es et des proc\u00e9dures pr\u00e9cises. Ces proc\u00e9dures doivent \u00eatre r\u00e9guli\u00e8rement r\u00e9\u00e9valu\u00e9es et ajust\u00e9es afin de r\u00e9duire les fausses alertes et maximiser l\u2019efficacit\u00e9 du SIEM.<\/p>\n\n\n\n<p><a id=\"_msocom_1\"><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les strat\u00e9gies de cybers\u00e9curit\u00e9 des organisations se sont profond\u00e9ment transform\u00e9es en l\u2019espace de quelques ann\u00e9es. Les professionnels de la s\u00e9curit\u00e9 ont d\u00e9sormais besoin d\u2019outils de cybers\u00e9curit\u00e9 puissants pour prot\u00e9ger leur syst\u00e8me d\u2019information et \u00e9viter les fuites de donn\u00e9es. Le SIEM est justement l\u2019un de ces outils. En analysant de grandes quantit\u00e9s de donn\u00e9es, un SIEM [&hellip;]<\/p>\n","protected":false},"author":20,"featured_media":7887176,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[1227],"class_list":["post-6381684","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cybersecurite"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Qu\u2019est-ce qu\u2019un SIEM et comment fonctionne-t-il ? | Oodrive<\/title>\n<meta name=\"description\" content=\"Quel est le r\u00f4le pr\u00e9cis d\u2019un SIEM ? Comment fonctionne-t-il et comment le mettre en place ? 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