{"id":135,"date":"2026-09-13T20:56:45","date_gmt":"2026-09-13T20:56:45","guid":{"rendered":"https:\/\/neranis.com\/?post_type=nrn_service&#038;p=135"},"modified":"2026-09-13T20:56:45","modified_gmt":"2026-09-13T20:56:45","slug":"reponse-aux-incidents-et-investigation-numerique-dfir","status":"publish","type":"nrn_service","link":"https:\/\/neranis.com\/fr\/services\/incident-response-and-digital-investigation-dfir\/","title":{"rendered":"R\u00e9ponse aux incidents et investigation num\u00e9rique \u2014 DFIR"},"content":{"rendered":"<section class=\"wp-block-group nrn2-section nrn2-page-hero is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-wrap is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-breadcrumb wp-block-paragraph\"><a href=\"https:\/\/neranis.com\/fr\/\">Accueil<\/a> <span aria-hidden=\"true\">\/<\/span> <a href=\"https:\/\/neranis.com\/fr\/expertise\/\">Expertise<\/a> \/ <a href=\"https:\/\/neranis.com\/fr\/expertise\/resilience-de-la-reponse\/\">R\u00e9ponse et r\u00e9silience<\/a><\/p>\n\n\n<div class=\"wp-block-group nrn2-service-top nrn2-hero-layout-r3 is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-hero-split-copy is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"nrn2-kicker wp-block-paragraph\">RES \/ RES-01<\/p>\n\n\n<h1 class=\"wp-block-heading nrn2-title\">R\u00e9ponse aux incidents et investigation num\u00e9rique \u2014 DFIR<\/h1>\n\n\n<p class=\"nrn2-lead wp-block-paragraph\">Aider \u00e0 comprendre un incident, \u00e0 en limiter les effets, \u00e0 pr\u00e9server les preuves utiles et \u00e0 pr\u00e9parer un r\u00e9tablissement ma\u00eetris\u00e9. L'enqu\u00eate s\u00e9pare les faits \u00e9tablis, les hypoth\u00e8ses et les donn\u00e9es manquantes ; elle ne couvre pas \u00e0 elle seule toutes les d\u00e9cisions juridiques ou de communication.<\/p>\n\n<\/div>\n\n\n<figure class=\"wp-block-image size-full nrn2-context-image nrn2-visual-asset-service-family-res\"><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"500\" src=\"https:\/\/neranis.com\/wp-content\/uploads\/2026\/09\/service-family-res.webp\" alt=\"\" class=\"wp-image-252\" srcset=\"https:\/\/neranis.com\/wp-content\/uploads\/2026\/09\/service-family-res.webp 1600w, https:\/\/neranis.com\/wp-content\/uploads\/2026\/09\/service-family-res-300x94.webp 300w, https:\/\/neranis.com\/wp-content\/uploads\/2026\/09\/service-family-res-1024x320.webp 1024w, https:\/\/neranis.com\/wp-content\/uploads\/2026\/09\/service-family-res-768x240.webp 768w, https:\/\/neranis.com\/wp-content\/uploads\/2026\/09\/service-family-res-1536x480.webp 1536w\" sizes=\"auto, (max-width: 1600px) 100vw, 1600px\" \/><\/figure>\n<\/div>\n<\/div>\n\n<\/section>\n\n\n<section class=\"wp-block-group nrn2-section is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-wrap is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-service-top is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-service-intro is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-kicker wp-block-paragraph\">QUAND C'EST UTILE<\/p>\n\n\n<h2 class=\"wp-block-heading nrn2-h2\">Une r\u00e9ponse cibl\u00e9e<br>\u00e0 un besoin d\u00e9fini.<\/h2>\n\n\n<p class=\"nrn2-body-lg wp-block-paragraph\">Compromis suspect\u00e9, ran\u00e7ongiciel, compte administrateur d\u00e9tourn\u00e9, fuite de donn\u00e9es suspect\u00e9e ou comportement anormal confirm\u00e9 par le SOC.<\/p>\n\n\n<div class=\"wp-block-buttons nrn2-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/neranis.com\/fr\/contact\/\">Discutez de ce service<\/a><\/div>\n\n<\/div>\n\n<\/div>\n\n\n<div class=\"wp-block-group nrn2-facts is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-kicker wp-block-paragraph\">EN UN COUP D'\u0152IL<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>Famille<\/strong><br><a href=\"https:\/\/neranis.com\/fr\/expertise\/resilience-de-la-reponse\/\">R\u00e9ponse et r\u00e9silience<\/a><\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>Engagement<\/strong><br>Projet ou assistance<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>R\u00e9f\u00e9rence<\/strong><br>RES-01<\/p>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/section>\n\n\n<section class=\"wp-block-group nrn2-section nrn2-canvas is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-wrap is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-section-heading is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-kicker wp-block-paragraph\">PORT\u00c9E ET R\u00c9SULTATS<\/p>\n\n\n<h2 class=\"wp-block-heading nrn2-h2\">Ce que couvre la mission.<\/h2>\n\n<\/div>\n\n<\/div>\n\n\n<div class=\"wp-block-group nrn2-delivery-grid is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-delivery-card is-layout-flow wp-block-group-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Port\u00e9e<\/h3>\n\n\n<ul class=\"wp-block-list nrn2-list\">\n<li>Cadrage d'urgence<\/li>\n\n\n<li>collecte autoris\u00e9e<\/li>\n\n\n<li>chronologie<\/li>\n\n\n<li>p\u00e9rim\u00e8tre connu<\/li>\n\n\n<li>confinement approuv\u00e9<\/li>\n\n\n<li>enqu\u00eate sur les causes profondes<\/li>\n\n\n<li>pr\u00e9servation des preuves<\/li>\n\n\n<li>recommandations en mati\u00e8re d'\u00e9radication et de r\u00e9cup\u00e9ration<\/li>\n\n\n<li>Le\u00e7ons tir\u00e9es<\/li>\n\n<\/ul>\n\n<\/div>\n\n\n<div class=\"wp-block-group nrn2-delivery-card is-layout-flow wp-block-group-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Livrables<\/h3>\n\n\n<ul class=\"wp-block-list nrn2-list\">\n<li>Registre des d\u00e9cisions<\/li>\n\n\n<li>inventaire des pi\u00e8ces \u00e0 conviction<\/li>\n\n\n<li>calendrier qualifi\u00e9<\/li>\n\n\n<li>compte rendu de situation<\/li>\n\n\n<li>recommandations<\/li>\n\n\n<li>rapport d'enqu\u00eate<\/li>\n\n\n<li>plan de redressement et de rem\u00e9diation<\/li>\n\n<\/ul>\n\n<\/div>\n\n\n<div class=\"wp-block-group nrn2-delivery-card nrn2-evidence is-layout-flow wp-block-group-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Preuve de r\u00e9ception<\/h3>\n\n\n<p class=\"wp-block-paragraph\">Le p\u00e9rim\u00e8tre examin\u00e9 est explicite ; les preuves sont suivies ; les d\u00e9cisions sont approuv\u00e9es ; les faits et les hypoth\u00e8ses sont s\u00e9par\u00e9s ; les conditions de reprise sont convenues ; l'incertitude et les actions en suspens sont consign\u00e9es.<\/p>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/section>\n\n\n<section class=\"wp-block-group nrn2-section is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-wrap is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-section-heading is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-kicker wp-block-paragraph\">LIVRAISON<\/p>\n\n\n<h2 class=\"wp-block-heading nrn2-h2\">Comment le travail est structur\u00e9.<\/h2>\n\n<\/div>\n\n<\/div>\n\n\n<div class=\"wp-block-group nrn2-two-col is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-prose is-layout-flow wp-block-group-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Approche<\/h3>\n\n\n<p class=\"wp-block-paragraph\">D\u00e9finir les objectifs et la responsabilit\u00e9 ; pr\u00e9parer les sc\u00e9narios et les ressources ; ex\u00e9cuter une r\u00e9ponse ou un exercice autoris\u00e9 ; documenter les preuves ; am\u00e9liorer et r\u00e9viser.<\/p>\n\n\n<h3 class=\"wp-block-heading\">Pr\u00e9requis et responsabilit\u00e9s<\/h3>\n\n\n<p class=\"wp-block-paragraph\">Client : d\u00e9cideurs, op\u00e9rations, propri\u00e9taires d'entreprise, services juridiques\/assureurs si n\u00e9cessaire, autorisations et ressources de r\u00e9cup\u00e9ration. Fournisseur : expertise contractuelle avec pr\u00e9servation des preuves.<\/p>\n\n<\/div>\n\n\n<div class=\"wp-block-group nrn2-prose is-layout-flow wp-block-group-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Facteurs de port\u00e9e<\/h3>\n\n\n<p class=\"wp-block-paragraph\">Criticit\u00e9, p\u00e9rim\u00e8tre, profondeur d'investigation, volume de donn\u00e9es, d\u00e9pendances, sc\u00e9narios et conditions de mobilisation. La pr\u00e9paration, la r\u00e9ponse, la reconstruction et les licences sont distinctes.<\/p>\n\n\n<h3 class=\"wp-block-heading\">Questions \u00e0 clarifier<\/h3>\n\n\n<p class=\"wp-block-paragraph\">L'incident est-il en cours ? Quels syst\u00e8mes et \u00e9l\u00e9ments de preuve sont disponibles ? Qui autorise les actions et coordonne la direction, les conseillers juridiques, les assureurs et les op\u00e9rations ?<\/p>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/section>\n\n\n<section class=\"wp-block-group nrn2-section nrn2-compact is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-wrap is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-boundaries is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-kicker wp-block-paragraph\">LIMITES IMPORTANTES<\/p>\n\n\n<p class=\"nrn2-body-lg wp-block-paragraph\">La r\u00e9ponse d\u00e9pend de la disponibilit\u00e9 et du contrat ; une disponibilit\u00e9 imm\u00e9diate n'est pas implicite. La notification r\u00e9glementaire et les d\u00e9cisions en mati\u00e8re d'assurance incombent aux parties responsables ; le traitement des \u00e9l\u00e9ments de preuve doit \u00eatre adapt\u00e9 au contexte.<\/p>\n\n\n<p class=\"wp-block-paragraph\">La r\u00e9cup\u00e9ration et l'enqu\u00eate ont des limites ; aucune promesse de r\u00e9cup\u00e9ration totale ou de d\u00e9lai de r\u00e9solution absolu n'est faite. Les r\u00e9sultats des exercices restent sp\u00e9cifiques au sc\u00e9nario test\u00e9.<\/p>\n\n<\/div>\n\n<\/div>\n\n<\/section>\n\n\n<section class=\"wp-block-group nrn2-section is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-wrap is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-section-heading is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-kicker wp-block-paragraph\">EN PRATIQUE<\/p>\n\n\n<h2 class=\"wp-block-heading nrn2-h2\">Situations illustratives.<\/h2>\n\n<\/div>\n\n\n<p class=\"nrn2-section-lead wp-block-paragraph\">Ces exemples d\u00e9crivent des engagements possibles et des r\u00e9sultats cibles. Il ne s'agit pas de r\u00e9f\u00e9rences clients ni de r\u00e9sultats obtenus.<\/p>\n\n<\/div>\n\n\n<details class=\"wp-block-details nrn2-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Sc\u00e9nario 01<\/summary>\n<p class=\"wp-block-paragraph\">Une entreprise observe un chiffrement de fichiers. Projet : coordonner le confinement, la collecte des preuves et les priorit\u00e9s de r\u00e9cup\u00e9ration avec ses \u00e9quipes. R\u00e9sultat vis\u00e9 : limiter la progression selon les capacit\u00e9s disponibles et reconstruire en utilisant des preuves v\u00e9rifi\u00e9es, sans promettre de r\u00e9cup\u00e9ration compl\u00e8te.<\/p>\n\n<\/details>\n\n\n<details class=\"wp-block-details nrn2-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Sc\u00e9nario 02<\/summary>\n<p class=\"wp-block-paragraph\">Un compte de direction semble avoir \u00e9t\u00e9 utilis\u00e9 \u00e0 l'\u00e9tranger. Projet : analyser les acc\u00e8s, les sessions et les r\u00e8gles de messagerie. R\u00e9sultat vis\u00e9 : confirmer la compromission ou rejeter l'hypoth\u00e8se sur la base des preuves disponibles ; l'historique manquant est signal\u00e9 lorsqu'il emp\u00eache de conclure.<\/p>\n\n<\/details>\n\n\n<details class=\"wp-block-details nrn2-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Contexte technologique et de r\u00e9f\u00e9rence<\/summary>\n<p class=\"wp-block-paragraph\">R\u00e9f\u00e9rence : NIST SP 800-61 R\u00e9v. 3 ; outils de collecte et d'investigation adapt\u00e9s aux exigences en mati\u00e8re de syst\u00e8mes, d'autorisations et de conservation.<\/p>\n\n\n<p class=\"wp-block-paragraph\">L'ensemble final des technologies est convenu lors du cadrage, sur la base de l'interop\u00e9rabilit\u00e9, des licences, des droits d'acc\u00e8s et des exigences op\u00e9rationnelles.<\/p>\n\n<\/details>\n\n<\/div>\n\n<\/section>\n\n\n<section class=\"wp-block-group nrn2-section is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-wrap is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-section-heading is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-kicker wp-block-paragraph\">SERVICES CONNECT\u00c9S<\/p>\n\n\n<h2 class=\"wp-block-heading nrn2-h2\">Construisez l'\u00e9tape suivante.<\/h2>\n\n<\/div>\n\n\n<p class=\"nrn2-section-lead wp-block-paragraph\">Ces services peuvent compl\u00e9ter la mission. Ils ne sont pas inclus automatiquement.<\/p>\n\n<\/div>\n\n\n<div class=\"wp-block-group nrn2-related-grid is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-service-card is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-ref wp-block-paragraph\">RES-05<\/p>\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/neranis.com\/fr\/services\/retablir-les-exercices-et-securiser-la-validation-de-la-reconstruction\/\">Restaurer les exercices et s\u00e9curiser la validation de la reconstruction<\/a><\/h3>\n\n\n<p class=\"nrn2-card-desc wp-block-paragraph\">V\u00e9rifiez que les donn\u00e9es et les services peuvent effectivement \u00eatre restaur\u00e9s dans un environnement contr\u00f4l\u00e9. L'exercice mesure le temps, r\u00e9v\u00e8le les d\u00e9pendances et teste les proc\u00e9dures avant qu'un incident r\u00e9el ne cr\u00e9e de l'urgence.<\/p>\n\n\n<p class=\"nrn2-text-link wp-block-paragraph\"><a href=\"https:\/\/neranis.com\/fr\/services\/retablir-les-exercices-et-securiser-la-validation-de-la-reconstruction\/\">D\u00e9couvrir ce service <span aria-hidden=\"true\">\u2197<\/span><\/a><\/p>\n\n<\/div>\n\n\n<div class=\"wp-block-group nrn2-service-card is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-ref wp-block-paragraph\">RES-06<\/p>\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/neranis.com\/fr\/services\/crise-informatique-et-exercices-de-table\/\">Cybercrise et exercices sur table<\/a><\/h3>\n\n\n<p class=\"nrn2-card-desc wp-block-paragraph\">R\u00e9unissez la direction, les \u00e9quipes commerciales, l'informatique et les fonctions de support autour d'un sc\u00e9nario de crise sans attaquer r\u00e9ellement la production. L'exercice teste les d\u00e9cisions, la coordination, la communication et l'utilisation des proc\u00e9dures.<\/p>\n\n\n<p class=\"nrn2-text-link wp-block-paragraph\"><a href=\"https:\/\/neranis.com\/fr\/services\/crise-informatique-et-exercices-de-table\/\">D\u00e9couvrir ce service <span aria-hidden=\"true\">\u2197<\/span><\/a><\/p>\n\n<\/div>\n\n\n<div class=\"wp-block-group nrn2-service-card is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-ref wp-block-paragraph\">REM-03<\/p>\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/neranis.com\/fr\/services\/programme-de-remediation-et-gestion-de-la-livraison-entre-les-equipes\/\">Programme de rem\u00e9diation et gestion de la livraison inter-\u00e9quipes<\/a><\/h3>\n\n\n<p class=\"nrn2-card-desc wp-block-paragraph\">Organisation des chantiers de s\u00e9curit\u00e9 entre \u00e9quipes ou prestataires, avec les priorit\u00e9s, les d\u00e9pendances et les d\u00e9cisions de la direction.<\/p>\n\n\n<p class=\"nrn2-text-link wp-block-paragraph\"><a href=\"https:\/\/neranis.com\/fr\/services\/programme-de-remediation-et-gestion-de-la-livraison-entre-les-equipes\/\">D\u00e9couvrir ce service <span aria-hidden=\"true\">\u2197<\/span><\/a><\/p>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/section>\n\n\n<section class=\"wp-block-group nrn2-section is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-wrap is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-cta is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-kicker wp-block-paragraph\">Commencer une conversation<\/p>\n\n\n<h2 class=\"wp-block-heading nrn2-h2\">Clarifiez la port\u00e9e.<\/h2>\n\n<\/div>\n\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-body-lg wp-block-paragraph\">Nous clarifierons l'objectif, les d\u00e9pendances et les responsabilit\u00e9s de ce service avant de proposer la livraison.<\/p>\n\n\n<div class=\"wp-block-buttons nrn2-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/neranis.com\/fr\/contact\/\">Discutez de vos priorit\u00e9s<\/a><\/div>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/section>","protected":false},"excerpt":{"rendered":"<p>Aider \u00e0 comprendre un incident, \u00e0 en limiter les effets, \u00e0 pr\u00e9server les preuves utiles et \u00e0 pr\u00e9parer un r\u00e9tablissement ma\u00eetris\u00e9. L'enqu\u00eate s\u00e9pare les faits \u00e9tablis, les hypoth\u00e8ses et les donn\u00e9es manquantes ; elle ne couvre pas \u00e0 elle seule toutes les d\u00e9cisions juridiques ou de communication.<\/p>","protected":false},"featured_media":0,"template":"single-nrn_service","meta":{"footnotes":""},"nrn_family":[16],"class_list":["post-135","nrn_service","type-nrn_service","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/neranis.com\/fr\/wp-json\/wp\/v2\/nrn_service\/135","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/neranis.com\/fr\/wp-json\/wp\/v2\/nrn_service"}],"about":[{"href":"https:\/\/neranis.com\/fr\/wp-json\/wp\/v2\/types\/nrn_service"}],"version-history":[{"count":2,"href":"https:\/\/neranis.com\/fr\/wp-json\/wp\/v2\/nrn_service\/135\/revisions"}],"predecessor-version":[{"id":530,"href":"https:\/\/neranis.com\/fr\/wp-json\/wp\/v2\/nrn_service\/135\/revisions\/530"}],"wp:attachment":[{"href":"https:\/\/neranis.com\/fr\/wp-json\/wp\/v2\/media?parent=135"}],"wp:term":[{"taxonomy":"nrn_family","embeddable":true,"href":"https:\/\/neranis.com\/fr\/wp-json\/wp\/v2\/nrn_family?post=135"}],"curies":[{"name":"Bien jou\u00e9","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}