{"id":17780,"date":"2026-08-05T05:32:12","date_gmt":"2026-08-05T05:32:12","guid":{"rendered":"https:\/\/windowsreport.com\/es\/el-servicio-de-phishing-greatness-suplanta-a-ringcentral-para-robar-cuentas-de-microsoft-365\/"},"modified":"2026-08-05T05:32:12","modified_gmt":"2026-08-05T05:32:12","slug":"el-servicio-de-phishing-greatness-suplanta-a-ringcentral-para-robar-cuentas-de-microsoft-365","status":"publish","type":"post","link":"https:\/\/windowsreport.com\/es\/el-servicio-de-phishing-greatness-suplanta-a-ringcentral-para-robar-cuentas-de-microsoft-365\/","title":{"rendered":"El servicio de phishing Greatness suplanta a RingCentral para robar cuentas de Microsoft 365"},"content":{"rendered":"\n<p>El servicio de phishing Greatness ahora suplanta a RingCentral para robar cuentas de Microsoft 365 mediante ataques de adversario en el medio y de c\u00f3digo de dispositivo.<\/p>\n\n\n\n<p>Greatness comenz\u00f3 operando como un servicio tradicional de robo de credenciales. Desde entonces ha evolucionado hasta convertirse en una plataforma m\u00e1s amplia capaz de capturar tokens de autenticaci\u00f3n y eludir algunas formas de autenticaci\u00f3n multifactor.<\/p>\n\n\n\n<p>Las campa\u00f1as se han dirigido principalmente a usuarios de Estados Unidos, Canad\u00e1, Reino Unido, Australia y Sud\u00e1frica. La plataforma tambi\u00e9n se ha expandido m\u00e1s all\u00e1 de Microsoft 365 para admitir ataques contra cuentas de iCloud, Yahoo y Google Workspace.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-attackers-impersonate-ringcentral-notifications\">Atacantes suplantan notificaciones de RingCentral<\/h2>\n\n\n\n<p>Los investigadores de <a href=\"https:\/\/zerobec.com\/blog\/greatness-phaas-aitm-and-device-code-phishing\" target=\"_blank\" rel=\"noopener noreferrer\">ZeroBEC<\/a> observaron que los operadores de Greatness explotaban el estatus de confianza de RingCentral para eludir las protecciones de seguridad del correo electr\u00f3nico.<\/p>\n\n\n\n<p>Los atacantes suplantaron la direcci\u00f3n service@ringcentral[.]com y enviaron correos maliciosos a clientes leg\u00edtimos de RingCentral. Los mensajes aparec\u00edan como notificaciones de mensajes de voz o alertas de evaluaci\u00f3n de desempe\u00f1o de empleados.<\/p>\n\n\n\n<p>Cada correo inclu\u00eda un aviso falso que afirmaba que el remitente hab\u00eda recibido aprobaci\u00f3n a trav\u00e9s de la lista de remitentes seguros de la organizaci\u00f3n. Este mensaje hac\u00eda que los correos parecieran m\u00e1s fiables e incitaba a los destinatarios a hacer clic en un bot\u00f3n incrustado.<\/p>\n\n\n\n<p>Seg\u00fan ZeroBEC, Microsoft Exchange asign\u00f3 a los mensajes un Nivel de confianza de spam de -1. Esa clasificaci\u00f3n permiti\u00f3 que los correos evitaran el filtrado antispam normal.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-greatness-steals-microsoft-365-authentication-tokens\">Greatness roba tokens de autenticaci\u00f3n de Microsoft 365<\/h3>\n\n\n\n<p>Al hacer clic en el bot\u00f3n malicioso, las v\u00edctimas eran redirigidas a infraestructura controlada por los operadores de Greatness.<\/p>\n\n\n\n<p>Algunas v\u00edctimas llegaban a una p\u00e1gina de phishing de adversario en el medio de Microsoft. La p\u00e1gina capturaba los tokens de autenticaci\u00f3n despu\u00e9s de que el usuario completara una solicitud de MFA.<\/p>\n\n\n\n<p>Otras v\u00edctimas entraban en un proceso de phishing de c\u00f3digo de dispositivo, que las persuad\u00eda para autorizar una sesi\u00f3n controlada por el atacante a trav\u00e9s del sistema de autenticaci\u00f3n leg\u00edtimo de Microsoft.<\/p>\n\n\n\n<p>Tras obtener acceso, los atacantes reutilizaban los tokens robados de Microsoft 365 mediante servidores privados virtuales y servicios VPN comerciales. Esto les permit\u00eda entrar en las cuentas comprometidas sin completar otro inicio de sesi\u00f3n est\u00e1ndar.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-attackers-search-emails-teams-chats-and-cloud-files\">Atacantes buscan correos, chats de Teams y archivos en la nube<\/h3>\n\n\n\n<p>Los atacantes buscaban en los buzones de Outlook y en las conversaciones de Microsoft Teams despu\u00e9s de comprometer una cuenta.<\/p>\n\n\n\n<p>Tambi\u00e9n acced\u00edan a sitios de SharePoint, archivos de OneDrive, contactos, calendarios y aplicaciones registradas. Gran parte de la informaci\u00f3n se recopilaba a trav\u00e9s de Microsoft Graph.<\/p>\n\n\n\n<p>En algunos casos, el acceso no autorizado permanec\u00eda activo durante m\u00e1s de dos semanas, lo que daba a los atacantes tiempo para buscar informaci\u00f3n empresarial sensible e identificar objetivos adicionales.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-researchers-examine-possible-ringcentral-breach-connection\">Investigadores examinan posible conexi\u00f3n con la brecha de RingCentral<\/h3>\n\n\n\n<p>RingCentral confirm\u00f3 recientemente una brecha de datos independiente reivindicada por el grupo de amenazas ShinyHunters. La empresa afirm\u00f3 que el incidente afect\u00f3 a informaci\u00f3n perteneciente a un n\u00famero limitado de clientes y que se estaba poniendo en contacto con ellos directamente.<\/p>\n\n\n\n<p>ZeroBEC cree que los usuarios de Greatness podr\u00edan haber obtenido una lista de clientes v\u00e1lidos de RingCentral a partir de esa brecha. Sin embargo, los investigadores no pudieron confirmar una conexi\u00f3n directa entre los incidentes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-organizations-should-review-email-allowlists\">Las organizaciones deber\u00edan revisar las listas de permitidos de correo<\/h3>\n\n\n\n<p>Los equipos de seguridad deber\u00edan revisar las listas de remitentes seguros y las listas de permitidos de correo electr\u00f3nico en busca de excepciones demasiado amplias. Las organizaciones deber\u00edan sustituir las exclusiones generales de dominio por reglas que tambi\u00e9n exijan una autenticaci\u00f3n SPF, DKIM y DMARC v\u00e1lida.<\/p>\n\n\n\n<p>Los administradores tambi\u00e9n deber\u00edan investigar los inicios de sesi\u00f3n inusuales de Microsoft 365 aprobados mediante MFA desde proveedores de alojamiento, servidores privados virtuales o direcciones de VPN comerciales.<\/p>\n\n\n\n<p>Cuando los administradores sospechen de un compromiso, deber\u00edan revocar inmediatamente el acceso activo y los tokens de actualizaci\u00f3n. Tambi\u00e9n deber\u00edan revisar los permisos de OAuth, la actividad de Microsoft Graph, las aplicaciones registradas y el acceso a todos los servicios de Microsoft 365.<\/p>\n\n\n\n<p>En otras noticias de seguridad, Microsoft descubri\u00f3 una <a href=\"https:\/\/windowsreport.com\/es\/microsoft-descubre-una-campana-global-de-malware-en-redes-wi-fi-de-hoteles\/\" target=\"_blank\" rel=\"noopener noreferrer\">campa\u00f1a global de malware en redes Wi-Fi de hoteles<\/a> y redujo <a href=\"https:\/\/windowsreport.com\/es\/microsoft-reduce-a-30-dias-la-vigencia-de-las-claves-de-api-de-nuget\/\" target=\"_blank\" rel=\"noopener noreferrer\">a 30 d\u00edas la vigencia de las claves de API de NuGet<\/a>.<\/p>\n\n\n\n<p>El malware tambi\u00e9n ha descubierto nuevas t\u00e9cnicas que pueden <a href=\"https:\/\/windowsreport.com\/es\/malware-puede-robar-passkeys-de-google-usando-ataques-pass-ta-key\/\" target=\"_blank\" rel=\"noopener noreferrer\">robar passkeys de Google<\/a>, lo que plantea preocupaciones adicionales sobre la seguridad de los sistemas de autenticaci\u00f3n sin contrase\u00f1a.<\/p>\n\n\n\n<p>V\u00eda <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>El servicio de phishing Greatness ahora suplanta a RingCentral para robar cuentas de Microsoft 365 mediante ataques de adversario en el medio y de c\u00f3digo de dispositivo. Greatness comenz\u00f3 operando como un servicio tradicional de robo de credenciales. Desde entonces ha evolucionado hasta convertirse en una plataforma m\u00e1s amplia capaz de capturar tokens de autenticaci\u00f3n [&hellip;]<\/p>\n","protected":false},"author":49,"featured_media":17781,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_enabled_clarity":"","footnotes":""},"categories":[44],"tags":[],"work":[],"class_list":["post-17780","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-resolucion-de-problemas"],"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>El servicio de phishing Greatness suplanta a RingCentral para robar cuentas de Microsoft 365 - WindowsReport ES (Spanish)<\/title>\n<meta name=\"description\" content=\"Los atacantes de Greatness suplantan alertas de RingCentral para robar tokens de Microsoft 365 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