{"id":25158,"date":"2026-08-05T05:28:55","date_gmt":"2026-08-05T05:28:55","guid":{"rendered":"https:\/\/windowsreport.com\/fr\/greatness-phishing-service-usurpe-ringcentral-pour-voler-des-comptes-microsoft-365\/"},"modified":"2026-08-05T05:28:55","modified_gmt":"2026-08-05T05:28:55","slug":"greatness-phishing-service-usurpe-ringcentral-pour-voler-des-comptes-microsoft-365","status":"publish","type":"post","link":"https:\/\/windowsreport.com\/fr\/greatness-phishing-service-usurpe-ringcentral-pour-voler-des-comptes-microsoft-365\/","title":{"rendered":"Greatness Phishing Service usurpe RingCentral pour voler des comptes Microsoft 365"},"content":{"rendered":"\n<p>Le service de phishing Greatness usurpe d\u00e9sormais l&rsquo;identit\u00e9 de RingCentral pour d\u00e9rober des comptes Microsoft 365 au moyen d&rsquo;attaques de type adversaire interm\u00e9diaire (AitM) et par code d&rsquo;appareil.<\/p>\n\n\n\n<p>Greatness op\u00e9rait au d\u00e9part comme un service de phishing traditionnel visant \u00e0 subtiliser des identifiants. Il a depuis \u00e9volu\u00e9 pour devenir une plateforme plus large capable de capturer des jetons d&rsquo;authentification et de contourner certaines formes d&rsquo;authentification multifacteur.<\/p>\n\n\n\n<p>Les campagnes ont principalement cibl\u00e9 des utilisateurs aux \u00c9tats-Unis, au Canada, au Royaume-Uni, en Australie et en Afrique du Sud. La plateforme s&rsquo;est \u00e9galement \u00e9tendue au-del\u00e0 de Microsoft 365 pour prendre en charge des 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 de 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 des op\u00e9rateurs de Greatness exploiter le statut de confiance de RingCentral pour contourner les protections de s\u00e9curit\u00e9 des courriels.<\/p>\n\n\n\n<p>Les attaquants ont usurp\u00e9 l&rsquo;adresse service@ringcentral[.]com et envoy\u00e9 des courriels malveillants \u00e0 de v\u00e9ritables clients de RingCentral. Les messages se pr\u00e9sentaient comme des notifications de messagerie vocale ou des alertes d&rsquo;\u00e9valuation des performances des employ\u00e9s.<\/p>\n\n\n\n<p>Chaque courriel comportait un avis fabriqu\u00e9 de toutes pi\u00e8ces affirmant que l&rsquo;exp\u00e9diteur avait \u00e9t\u00e9 approuv\u00e9 par le biais de la liste des exp\u00e9diteurs approuv\u00e9s de l&rsquo;organisation. Ce message rendait les courriels plus dignes de confiance et encourageait 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 niveau de confiance du courrier ind\u00e9sirable (SCL) de -1. Cette classification a permis aux courriels d&rsquo;\u00e9chapper au filtrage normal du courrier ind\u00e9sirable.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-greatness-steals-microsoft-365-authentication-tokens\">Greatness vole les jetons d&rsquo;authentification 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 ont atterri sur une page de phishing Microsoft de type adversaire interm\u00e9diaire. La page capturait les jetons d&rsquo;authentification apr\u00e8s que l&rsquo;utilisateur a valid\u00e9 une demande MFA.<\/p>\n\n\n\n<p>D&rsquo;autres victimes se sont retrouv\u00e9es dans un processus de phishing par code d&rsquo;appareil, qui les a persuad\u00e9es d&rsquo;autoriser une session contr\u00f4l\u00e9e par l&rsquo;attaquant via le syst\u00e8me d&rsquo;authentification l\u00e9gitime de Microsoft.<\/p>\n\n\n\n<p>Apr\u00e8s avoir obtenu l&rsquo;acc\u00e8s, les attaquants ont r\u00e9utilis\u00e9 les jetons Microsoft 365 vol\u00e9s via des serveurs priv\u00e9s virtuels et des services VPN commerciaux. Cela leur a permis de p\u00e9n\u00e9trer dans les comptes compromis sans passer par une nouvelle authentification standard.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-attackers-search-emails-teams-chats-and-cloud-files\">Les attaquants fouillent les courriels, les conversations Teams et les fichiers cloud<\/h3>\n\n\n\n<p>Les attaquants ont fouill\u00e9 les bo\u00eetes aux lettres Outlook et les conversations Microsoft Teams apr\u00e8s avoir compromis un compte.<\/p>\n\n\n\n<p>Ils ont \u00e9galement acc\u00e9d\u00e9 aux sites SharePoint, aux fichiers OneDrive, aux contacts, aux calendriers et aux applications enregistr\u00e9es. Une grande partie des informations a \u00e9t\u00e9 collect\u00e9e via Microsoft Graph.<\/p>\n\n\n\n<p>Dans certains cas, l&rsquo;acc\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&rsquo;identifier 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 de 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 cybercriminels ShinyHunters. L&rsquo;entreprise a d\u00e9clar\u00e9 que l&rsquo;incident a affect\u00e9 des informations appartenant \u00e0 un nombre limit\u00e9 de clients et qu&rsquo;elle les contactait directement.<\/p>\n\n\n\n<p>ZeroBEC pense que les utilisateurs de Greatness ont pu obtenir une liste de clients valides de RingCentral \u00e0 la suite de cette violation. Cependant, les chercheurs n&rsquo;ont pas pu confirmer de 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 revoir leurs listes d&rsquo;exp\u00e9diteurs autoris\u00e9s<\/h3>\n\n\n\n<p>Les \u00e9quipes de s\u00e9curit\u00e9 devraient passer en revue les listes d&rsquo;exp\u00e9diteurs approuv\u00e9s et les listes d&rsquo;autorisation de courrier \u00e9lectronique \u00e0 la recherche d&rsquo;exceptions trop larges. Les organisations devraient remplacer les exclusions de domaine globales par des r\u00e8gles exigeant \u00e9galement une authentification SPF, DKIM et DMARC valide.<\/p>\n\n\n\n<p>Les administrateurs devraient \u00e9galement enqu\u00eater sur les connexions Microsoft 365 approuv\u00e9es par MFA qui proviennent d&rsquo;adresses d&rsquo;h\u00e9bergeurs, de serveurs priv\u00e9s virtuels ou de VPN commerciaux et qui semblent inhabituelles.<\/p>\n\n\n\n<p>Lorsque les administrateurs soup\u00e7onnent une compromission, ils doivent imm\u00e9diatement r\u00e9voquer les acc\u00e8s actifs et les jetons d&rsquo;actualisation. Ils doivent \u00e9galement examiner les autorisations OAuth, l&rsquo;activit\u00e9 Microsoft Graph, les applications enregistr\u00e9es et l&rsquo;acc\u00e8s aux diff\u00e9rents services Microsoft 365.<\/p>\n\n\n\n<p>Dans d&rsquo;autres actualit\u00e9s sur la s\u00e9curit\u00e9, Microsoft a d\u00e9couvert une campagne mondiale de malwares ciblant les points d&rsquo;acc\u00e8s Wi-Fi d&rsquo;h\u00f4tels et a limit\u00e9 <a href=\"https:\/\/windowsreport.com\/fr\/microsoft-reduit-la-duree-de-vie-des-cles-api-nuget-a-30-jours\/\" target=\"_blank\" rel=\"noopener noreferrer\">la dur\u00e9e de vie des cl\u00e9s API NuGet \u00e0 30&nbsp;jours<\/a>.<\/p>\n\n\n\n<p>Des logiciels malveillants ont \u00e9galement d\u00e9couvert de nouvelles techniques capables de <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&rsquo;acc\u00e8s Google<\/a>, ce qui soul\u00e8ve des inqui\u00e9tudes suppl\u00e9mentaires quant \u00e0 la s\u00e9curit\u00e9 des syst\u00e8mes d&rsquo;authentification 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 usurpe d\u00e9sormais l&rsquo;identit\u00e9 de RingCentral pour d\u00e9rober des comptes Microsoft 365 au moyen d&rsquo;attaques de type adversaire interm\u00e9diaire (AitM) et par code d&rsquo;appareil. Greatness op\u00e9rait au d\u00e9part comme un service de phishing traditionnel visant \u00e0 subtiliser des identifiants. Il a depuis \u00e9volu\u00e9 pour devenir une plateforme plus large capable de [&hellip;]<\/p>\n","protected":false},"author":49,"featured_media":25159,"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-25158","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 v28.1 (Yoast SEO v28.1) - 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=\"Les attaquants Greatness falsifient les alertes RingCentral pour voler des jetons Microsoft 365 via des attaques AiTM et de phishing par code d\u2019appareil\" \/>\n<meta name=\"robots\" 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