{"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\/it\/blog\/news\/simbiote-vredonosnoe-po-dlya-linux-ispolzuyushhee-ebpf-i-ld_preload-dlya-skrytiya","title":{"rendered":"Simbiote \u2014 malware per Linux che utilizza eBPF e LD_PRELOAD per nascondere","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>I ricercatori delle aziende Intezer e BlackBerry hanno scoperto un software malicioso, con il nome in codice Simbiote, utilizzato per l'inserimento di backdoor e rootkit su server compromessi che operano sotto Linux. Il software \u00e8 stato individuato nei sistemi di istituzioni finanziarie in diversi paesi dell'America Latina. Per installare Simbiote nel sistema, l'attaccante deve avere accesso root, che pu\u00f2 essere acquisito, ad esempio, sfruttando vulnerabilit\u00e0 non corrette o a causa di fuga di credenziali. Simbiote consente di mantenere la propria presenza nel sistema dopo un'intrusione per effettuare ulteriori attacchi, nascondere le attivit\u00e0 di altre applicazioni dannose e organizzare l'intercettazione di dati riservati.        <\/p>\n<p>Una caratteristica di Simbiote \u00e8 la diffusione in forma di libreria condivisa, che viene caricata all'avvio di tutti i processi tramite il meccanismo LD_PRELOAD e sostituisce alcune chiamate della libreria standard. I gestori delle chiamate sostituite nascondono le attivit\u00e0 associate alla backdoor, ad esempio escludendo determinati elementi nell'elenco dei processi, bloccando l'accesso a file specifici in \/proc, nascondendo file nelle directory, escludendo la libreria condivisa dannosa nell'output di ldd (viene effettuato il recupero della funzione execve e l'analisi delle chiamate con la variabile d'ambiente LD_TRACE_LOADED_OBJECTS), e non mostrando i socket di rete associati ad attivit\u00e0 dannose.       <\/p>\n<p>Per proteggere l'ispezione del traffico viene sovrascritto le funzioni della libreria libpcap, filtrando la lettura di \/proc\/net\/tcp e caricando nel kernel un programma eBPF, che ostacola il funzionamento degli analizzatori di traffico e scarta le richieste esterne ai propri gestori di rete. Il programma eBPF viene eseguito tra i primi gestori e viene eseguito al livello pi\u00f9 basso dello stack di rete, permettendo di nascondere l'attivit\u00e0 di rete della backdoor anche dagli analizzatori avviati successivamente.    <\/p>\n<p>Simbiote consente anche di bypassare alcuni analizzatori di attivit\u00e0 nel file system, poich\u00e9 il furto di dati riservati pu\u00f2 avvenire non a livello di apertura dei file, ma attraverso l'intercettazione delle operazioni di lettura da questi file in applicazioni legittime (ad esempio, la sostituzione delle funzioni delle librerie consente di intercettare l'inserimento della password da parte dell'utente o i dati caricati da un file con la chiave di accesso). Per organizzare l'accesso remoto, Simbiote intercetta alcune chiamate PAM (Pluggable Authentication Module), consentendo di connettersi al sistema tramite SSH con credenziali di attacco specifiche. \u00c8 prevista anche una possibilit\u00e0 nascosta di elevare i propri privilegi fino all'utente root tramite l'impostazione della variabile ambiente HTTP_SETTHIS.     <center><img decoding=\"async\" alt=\"Simbiote - malware per Linux che utilizza eBPF e LD_PRELOAD per nascondersi\" src=\"\/wp-content\/uploads\/2022\/06\/f41f9f55e39860892037eb9b328a7df7.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center><br \/>\n<br \/>Fonte: <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 5.0.1.1 - 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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il nome di codice Simbiote, utilizzato per l'installazione di backdoor e rootkit su server compromessi, in esecuzione.","canonical_url":"https:\/\/prohoster.info\/it\/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":"it_IT","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, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0435\u0435 eBPF \u0438 LD_PRELOAD \u0434\u043b\u044f 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