{"id":104340,"date":"2022-06-10T09:36:51","date_gmt":"2022-06-10T07:36:52","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/simbiote-vredonosnoe-po-dlya-linux-ispolzuyushhee-ebpf-i-ld_preload-dlya-skrytiya"},"modified":"2022-06-10T09:36:51","modified_gmt":"2022-06-10T07:36:52","slug":"simbiote-vredonosnoe-po-dlya-linux-ispolzuyushhee-ebpf-i-ld_preload-dlya-skrytiya","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/simbiote-vredonosnoe-po-dlya-linux-ispolzuyushhee-ebpf-i-ld_preload-dlya-skrytiya","title":{"rendered":"Simbiote \u2014 malware para Linux que utiliza eBPF y LD_PRELOAD para ocultarse","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Investigadores de las empresas Intezer y BlackBerry han descubierto un malware llamado Simbiote, utilizado para inyectar puertas traseras y rootkits en servidores comprometidos que operan bajo Linux. Se detect\u00f3 este malware en sistemas de instituciones financieras de varios pa\u00edses de Am\u00e9rica Latina. Para instalar Simbiote en el sistema, el atacante debe tener acceso root, el cual puede obtenerse, por ejemplo, explotando vulnerabilidades no corregidas o mediante el robo de credenciales. Simbiote permite mantener su presencia en el sistema despu\u00e9s de un ataque para llevar a cabo futuras incursiones, ocultar la actividad de otras aplicaciones maliciosas y organizar la interceptaci\u00f3n de datos confidenciales.        <\/p>\n<p>Una caracter\u00edstica de Simbiote es su propagaci\u00f3n en forma de biblioteca compartida, que se carga durante el inicio de todos los procesos mediante el mecanismo LD_PRELOAD y reemplaza algunas llamadas de la biblioteca est\u00e1ndar. Los controladores de las llamadas modificadas ocultan la actividad relacionada con la puerta trasera, por ejemplo, excluyen elementos espec\u00edficos de la lista de procesos, bloquean el acceso a ciertos archivos en \/proc, ocultan archivos en directorios, excluyen la biblioteca compartida maliciosa del resultado de ldd (interceptando la funci\u00f3n execve y analizando las llamadas con la variable de entorno LD_TRACE_LOADED_OBJECTS), y no muestran los sockets de red relacionados con la actividad maliciosa.       <\/p>\n<p>Para protegerse contra la inspecci\u00f3n del tr\u00e1fico, se sobrescriben las funciones de la biblioteca libpcap, se filtra la lectura de \/proc\/net\/tcp y se carga en el kernel un programa eBPF que impide el funcionamiento de los analizadores de tr\u00e1fico y descarta solicitudes externas a sus propios controladores de red. El programa eBPF se ejecuta como uno de los primeros controladores y se ejecuta en el nivel m\u00e1s bajo de la pila de red, lo que permite ocultar la actividad de red de la puerta trasera incluso de los analizadores que se inician posteriormente.    <\/p>\n<p>Simbiote tambi\u00e9n permite evadir algunos analizadores de actividad en el sistema de archivos, ya que el robo de datos confidenciales puede llevarse a cabo no a nivel de apertura de archivos, sino a trav\u00e9s de la interceptaci\u00f3n de operaciones de lectura de estos archivos en aplicaciones leg\u00edtimas (por ejemplo, la modificaci\u00f3n de funciones de biblioteca permite interceptar la entrada de contrase\u00f1as por parte del usuario o los datos cargados desde archivos con claves de acceso). Para permitir el acceso remoto, Simbiote intercepta algunas llamadas PAM (M\u00f3dulo de Autenticaci\u00f3n Pluggable), lo que permite conectarse al sistema a trav\u00e9s de SSH con credenciales de ataque espec\u00edficas. Tambi\u00e9n se prev\u00e9 una capacidad oculta para elevar sus privilegios al usuario root mediante la configuraci\u00f3n de una variable de entorno HTTP_SETTHIS.     <center><img decoding=\"async\" alt=\"Simbiote - software malicioso para Linux que utiliza eBPF y LD_PRELOAD para ocultarse\" src=\"\/wp-content\/uploads\/2022\/06\/f41f9f55e39860892037eb9b328a7df7.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center><br \/>\n<br \/>Fuente: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=57328\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0439 Intezer \u0438 BlackBerry \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0438\u043b\u0438 \u0432\u0440\u0435\u0434\u043e\u043d\u043e\u0441\u043d\u043e\u0435 \u041f\u041e, \u043f\u043e\u043b\u0443\u0447\u0438\u0432\u0448\u0435\u0435 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f Simbiote \u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u043e\u0435 \u0434\u043b\u044f \u0432\u043d\u0435\u0434\u0440\u0435\u043d\u0438\u044f \u0431\u044d\u043a\u0434\u043e\u0440\u043e\u0432 \u0438 rootkit-\u043e\u0432 \u043d\u0430 \u0441\u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0435 \u0441\u0435\u0440\u0432\u0435\u0440\u044b, \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0438\u0445 \u043f\u043e\u0434 \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435\u043c Linux. \u0412\u0440\u0435\u0434\u043e\u043d\u043e\u0441\u043d\u043e\u0435 \u041f\u041e \u0431\u044b\u043b\u043e \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043e \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0444\u0438\u043d\u0430\u043d\u0441\u043e\u0432\u044b\u0445 \u0443\u0447\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u0439 \u0440\u044f\u0434\u0430 \u0441\u0442\u0440\u0430\u043d \u041b\u0430\u0442\u0438\u043d\u0441\u043a\u043e\u0439 \u0410\u043c\u0435\u0440\u0438\u043a\u0438. \u0414\u043b\u044f \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0438 Simbiote \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0443 \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u0439 \u0434\u043e\u043b\u0436\u0435\u043d \u0438\u043c\u0435\u0442\u044c root-\u0434\u043e\u0441\u0442\u0443\u043f, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u043f\u043e\u043b\u0443\u0447\u0435\u043d, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0432 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":104341,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-104340","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0439 Intezer \u0438 BlackBerry \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0438\u043b\u0438 \u0432\u0440\u0435\u0434\u043e\u043d\u043e\u0441\u043d\u043e\u0435 \u041f\u041e, \u043f\u043e\u043b\u0443\u0447\u0438\u0432\u0448\u0435\u0435 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f Simbiote \u0438 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un software malicioso que ha recibido el nombre en clave Simbiote y que se utiliza para implementar puertas traseras y rootkits en servidores comprometidos que operan bajo Linux.","canonical_url":"https:\/\/prohoster.info\/es\/blog\/news\/simbiote-vredonosnoe-po-dlya-linux-ispolzuyushhee-ebpf-i-ld_preload-dlya-skrytiya","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"es_ES","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47Simbiote \u2014 \u0432\u0440\u0435\u0434\u043e\u043d\u043e\u0441\u043d\u043e\u0435 \u041f\u041e \u0434\u043b\u044f Linux, 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