{"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\/ro\/blog\/news\/simbiote-vredonosnoe-po-dlya-linux-ispolzuyushhee-ebpf-i-ld_preload-dlya-skrytiya","title":{"rendered":"Simbiote \u2014 software mali\u021bios pentru Linux, care folose\u0219te eBPF \u0219i LD_PRELOAD pentru a se ascunde","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Cercet\u0103torii de la companiile Intezer \u0219i BlackBerry au descoperit un malware denumit Simbiote, utilizat pentru a introduce backdoor-uri \u0219i rootkit-uri pe serverele compromise care func\u021bioneaz\u0103 sub Linux. Malware-ul a fost identificat pe sistemele institu\u021biilor financiare din diverse \u021b\u0103ri din America Latin\u0103. Pentru a instala Simbiote \u00een sistem, atacatorul trebuie s\u0103 aib\u0103 acces root, care poate fi ob\u021binut, de exemplu, prin exploatarea vulnerabilit\u0103\u021bilor nev\u0103zute sau prin scurgeri de creden\u021biale. Simbiote permite men\u021binerea prezen\u021bei \u00een sistem dup\u0103 atac pentru a efectua atacuri ulterioare, a masca activitatea altor aplica\u021bii malware \u0219i a organiza interceptarea datelor confiden\u021biale. <\/p>\n

O caracteristic\u0103 a Simbiote este distribuirea sub forma unei biblioteci partajate, care este \u00eenc\u0103rcat\u0103 \u00een timpul ini\u021bierii tuturor proceselor prin intermediul mecanismului LD_PRELOAD \u0219i \u00eenlocuie\u0219te anumite apeluri ale bibliotecilor standard. Manevrarea apelurilor modificate mascheaz\u0103 activitatea asociat\u0103 backdoor-ului, de exemplu, exclude anumite elemente din lista proceselor, blocheaz\u0103 accesul la anumite fi\u0219iere din \/proc, ascunde fi\u0219iere \u00een directoare, exclude biblioteca partajat\u0103 malware din rezultatul ldd (se realizeaz\u0103 interceptarea func\u021biei execve \u0219i analiza apelurilor cu variabila de mediu LD_TRACE_LOADED_OBJECTS) \u0219i nu afi\u0219eaz\u0103 socket-urile re\u021belei asociate activit\u0103\u021bii malware. <\/p>\n

Pentru a proteja \u00eempotriva inspect\u0103rii traficului, sunt suprascrise func\u021bii ale bibliotecii libpcap, se filtreaz\u0103 citirile din \/proc\/net\/tcp \u0219i se \u00eencarc\u0103 \u00een kernel programele eBPF care \u00eempiedic\u0103 func\u021bionarea analizatoarelor de trafic \u0219i sorteaz\u0103 cererile externe c\u0103tre propriile manipulatoare de re\u021bea. Programele eBPF sunt executate printre primii manipulatoare \u0219i func\u021bioneaz\u0103 la cel mai jos nivel al stivei de re\u021bea, ceea ce permite mascare activitatea re\u021belei backdoor-ului inclusiv de c\u0103tre analizatoare lansate ulterior. <\/p>\n

Simbiote permite, de asemenea, ocolirea anumitor analizoare de activitate \u00een sistemul de fi\u0219iere, deoarece furtul datelor confiden\u021biale se poate realiza nu la nivelul deschiderii fi\u0219ierelor, ci prin interceptarea opera\u021biunilor de citire din aceste fi\u0219iere \u00een aplica\u021biile legitime (de exemplu, substituirea func\u021biilor de bibliotec\u0103 permite interceptarea introducerii parolei de c\u0103tre utilizator sau a datelor \u00eenc\u0103rcate din fi\u0219ier cu cheia de acces). Pentru a organiza accesul la distan\u021b\u0103, Simbiote intercepta anumite apeluri PAM (Pluggable Authentication Module), permi\u021b\u00e2nd conectarea la sistem prin SSH cu anumite acreditive de atac. De asemenea, este prev\u0103zut\u0103 o op\u021biune ascuns\u0103 de a-\u0219i cre\u0219te privilegii la utilizator root prin setarea variabilei de mediu HTTP_SETTHIS.

\"Simbiote<\/center>
\n
Sursa: opennet.ro<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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 […]<\/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\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Simbiote \u2014 malware pentru Linux, utiliz\u00e2nd eBPF \u0219i LD_PRELOAD pentru a se ascunde | ProHoster","description":"Cercet\u0103torii de la companiile Intezer \u0219i BlackBerry au descoperit malware cunoscut sub numele de cod Simbiote, folosit pentru a introduce backdoor-uri \u0219i rootkit-uri \u00een serverele compromise care 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