{"id":25160,"date":"2026-08-05T05:38:18","date_gmt":"2026-08-05T05:38:18","guid":{"rendered":"https:\/\/windowsreport.com\/fr\/greatness-phishing-service-usurpe-ringcentral-pour-voler-des-comptes-microsoft-365-2\/"},"modified":"2026-08-05T05:38:18","modified_gmt":"2026-08-05T05:38:18","slug":"greatness-phishing-service-usurpe-ringcentral-pour-voler-des-comptes-microsoft-365-2","status":"publish","type":"post","link":"https:\/\/windowsreport.com\/fr\/greatness-phishing-service-usurpe-ringcentral-pour-voler-des-comptes-microsoft-365-2\/","title":{"rendered":"Greatness Phishing Service usurpe RingCentral pour voler des comptes Microsoft 365"},"content":{"rendered":"\n<p>Le service de phishing Greatness se fait d\u00e9sormais passer pour RingCentral afin de voler des comptes Microsoft 365 via des attaques de type adversaire-au-milieu et par code d\u2019appareil.<\/p>\n\n\n\n<p>Greatness fonctionnait au d\u00e9part comme un service de phishing traditionnel pour le vol d\u2019identifiants. Il a depuis \u00e9volu\u00e9 pour devenir une plateforme plus large capable de capturer des jetons d\u2019authentification et de contourner certaines formes d\u2019authentification multifacteur.<\/p>\n\n\n\n<p>Les campagnes ont principalement cibl\u00e9 les utilisateurs aux \u00c9tats-Unis, au Canada, au Royaume-Uni, en Australie et en Afrique du Sud. La plateforme s\u2019est \u00e9galement \u00e9tendue au-del\u00e0 de Microsoft 365 pour prendre en charge les attaques contre les comptes iCloud, Yahoo et Google Workspace.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-attackers-impersonate-ringcentral-notifications\">Les attaquants usurpent les notifications RingCentral<\/h2>\n\n\n\n<p><a href=\"https:\/\/zerobec.com\/blog\/greatness-phaas-aitm-and-device-code-phishing\" target=\"_blank\" rel=\"noopener noreferrer\">Les chercheurs de ZeroBEC<\/a> ont observ\u00e9 que les op\u00e9rateurs de Greatness exploitaient le statut de confiance de RingCentral pour contourner les protections de la messagerie.<\/p>\n\n\n\n<p>Les attaquants ont usurp\u00e9 l\u2019adresse service@ringcentral[.]com et envoy\u00e9 des e-mails malveillants \u00e0 des clients l\u00e9gitimes de RingCentral. Les messages apparaissaient comme des notifications de messagerie vocale ou des alertes d\u2019\u00e9valuation des performances des employ\u00e9s.<\/p>\n\n\n\n<p>Chaque e-mail incluait un avis fabriqu\u00e9 affirmant que l\u2019exp\u00e9diteur avait re\u00e7u l\u2019approbation via la liste des exp\u00e9diteurs approuv\u00e9s de l\u2019organisation. Ce message rendait les e-mails plus dignes de confiance et incitait les destinataires \u00e0 cliquer sur un bouton int\u00e9gr\u00e9.<\/p>\n\n\n\n<p>Selon ZeroBEC, Microsoft Exchange a attribu\u00e9 aux messages un Spam Confidence Level de -1. Cette classification a permis aux e-mails d\u2019\u00e9viter le filtrage anti-spam normal.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-greatness-steals-microsoft-365-authentication-tokens\">Greatness vole les jetons d\u2019authentification Microsoft 365<\/h3>\n\n\n\n<p>Cliquer sur le bouton malveillant redirigeait les victimes vers une infrastructure contr\u00f4l\u00e9e par les op\u00e9rateurs de Greatness.<\/p>\n\n\n\n<p>Certaines victimes arrivaient sur une page de phishing Microsoft de type adversaire-au-milieu. La page capturait les jetons d\u2019authentification une fois que l\u2019utilisateur avait termin\u00e9 une demande MFA.<\/p>\n\n\n\n<p>D\u2019autres victimes entraient dans un processus de phishing par code d\u2019appareil, ce qui les persuadait d\u2019autoriser une session contr\u00f4l\u00e9e par l\u2019attaquant via le syst\u00e8me d\u2019authentification l\u00e9gitime de Microsoft.<\/p>\n\n\n\n<p>Apr\u00e8s avoir obtenu l\u2019acc\u00e8s, les attaquants r\u00e9utilisaient les jetons Microsoft 365 vol\u00e9s via des serveurs priv\u00e9s virtuels et des services VPN commerciaux. Cela leur permettait d\u2019acc\u00e9der aux comptes compromis sans effectuer une autre connexion standard.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-attackers-search-emails-teams-chats-and-cloud-files\">Les attaquants recherchent des e-mails, des conversations Teams et des fichiers cloud<\/h3>\n\n\n\n<p>Les attaquants fouillaient les bo\u00eetes aux lettres Outlook et les conversations Microsoft Teams apr\u00e8s avoir compromis un compte.<\/p>\n\n\n\n<p>Ils acc\u00e9daient \u00e9galement aux sites SharePoint, aux fichiers OneDrive, aux contacts, aux calendriers et aux applications enregistr\u00e9es. Une grande partie des informations \u00e9tait collect\u00e9e via Microsoft Graph.<\/p>\n\n\n\n<p>Dans certains cas, l\u2019acc\u00e8s non autoris\u00e9 est rest\u00e9 actif pendant plus de deux semaines, laissant aux attaquants le temps de rechercher des informations commerciales sensibles et d\u2019identifier des cibles suppl\u00e9mentaires.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-researchers-examine-possible-ringcentral-breach-connection\">Les chercheurs examinent un lien possible avec la violation de donn\u00e9es RingCentral<\/h3>\n\n\n\n<p>RingCentral a r\u00e9cemment confirm\u00e9 une violation de donn\u00e9es distincte revendiqu\u00e9e par le groupe de menace ShinyHunters. L\u2019entreprise a d\u00e9clar\u00e9 que l\u2019incident affectait les informations appartenant \u00e0 un nombre limit\u00e9 de clients et qu\u2019elle les contactait directement.<\/p>\n\n\n\n<p>ZeroBEC pense que les utilisateurs de Greatness pourraient avoir obtenu une liste de clients RingCentral valides \u00e0 partir de cette violation. Cependant, les chercheurs n\u2019ont pas pu confirmer un lien direct entre les incidents.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-organizations-should-review-email-allowlists\">Les organisations devraient examiner leurs listes d\u2019exp\u00e9diteurs autoris\u00e9s<\/h3>\n\n\n\n<p>Les \u00e9quipes de s\u00e9curit\u00e9 devraient examiner les listes d\u2019exp\u00e9diteurs approuv\u00e9s et les listes d\u2019autorisation des e-mails pour d\u00e9tecter les exceptions trop larges. Les organisations devraient remplacer les exclusions de domaine g\u00e9n\u00e9rales par des r\u00e8gles qui exigent \u00e9galement une authentification SPF, DKIM et DMARC valide.<\/p>\n\n\n\n<p>Les administrateurs devraient \u00e9galement examiner les connexions Microsoft 365 inhabituelles approuv\u00e9es par MFA provenant de fournisseurs d\u2019h\u00e9bergement, de serveurs priv\u00e9s virtuels ou d\u2019adresses VPN commerciales.<\/p>\n\n\n\n<p>Lorsque les administrateurs soup\u00e7onnent une compromission, ils devraient r\u00e9voquer imm\u00e9diatement l\u2019acc\u00e8s actif et les jetons d\u2019actualisation. Ils devraient \u00e9galement examiner les autorisations OAuth, l\u2019activit\u00e9 Microsoft Graph, les applications enregistr\u00e9es et l\u2019acc\u00e8s aux diff\u00e9rents services Microsoft 365.<\/p>\n\n\n\n<p>Dans d\u2019autres actualit\u00e9s de s\u00e9curit\u00e9, Microsoft a d\u00e9couvert une campagne mondiale de malwares via le Wi-Fi des h\u00f4tels et <a href=\"https:\/\/windowsreport.com\/fr\/microsoft-reduit-la-duree-de-vie-des-cles-api-nuget-a-30-jours\/\" target=\"_blank\" rel=\"noopener noreferrer\">a limit\u00e9 la dur\u00e9e de vie des cl\u00e9s API NuGet \u00e0 30 jours<\/a>.<\/p>\n\n\n\n<p>Des malwares ont \u00e9galement d\u00e9couvert de nouvelles techniques qui peuvent <a href=\"https:\/\/windowsreport.com\/fr\/un-malware-peut-voler-les-cles-dacces-google-a-laide-dattaques-pass-ta-key\/\" target=\"_blank\" rel=\"noopener noreferrer\">voler les cl\u00e9s d\u2019acc\u00e8s Google<\/a>, suscitant des inqui\u00e9tudes suppl\u00e9mentaires quant \u00e0 la s\u00e9curit\u00e9 des syst\u00e8mes d\u2019authentification sans mot de passe.<\/p>\n\n\n\n<p>Via <a href=\"https:\/\/www.bleepingcomputer.com\/news\/security\/phishing-service-spoofs-ringcentral-to-steal-microsoft-365-accounts\/\" target=\"_blank\" rel=\"noopener noreferrer\">BleepingComputer<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le service de phishing Greatness se fait d\u00e9sormais passer pour RingCentral afin de voler des comptes Microsoft 365 via des attaques de type adversaire-au-milieu et par code d\u2019appareil. Greatness fonctionnait au d\u00e9part comme un service de phishing traditionnel pour le vol d\u2019identifiants. Il a depuis \u00e9volu\u00e9 pour devenir une plateforme plus large capable de capturer [&hellip;]<\/p>\n","protected":false},"author":49,"featured_media":25161,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_enabled_clarity":"","footnotes":""},"categories":[1019],"tags":[],"work":[],"class_list":["post-25160","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutoriels"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.2 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Greatness Phishing Service usurpe RingCentral pour voler des comptes Microsoft 365<\/title>\n<meta name=\"description\" content=\"Des attaquants Greatness usurpent les alertes RingCentral pour voler des jetons Microsoft 365 via des attaques d\u2019hame\u00e7onnage AiTM et par code d\u2019appareil\" \/>\n<meta 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