{"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\/sk\/blog\/news\/simbiote-vredonosnoe-po-dlya-linux-ispolzuyushhee-ebpf-i-ld_preload-dlya-skrytiya","title":{"rendered":"Simbiote \u2014 malv\u00e9rov\u00fd softv\u00e9r pre Linux, ktor\u00fd pou\u017e\u00edva eBPF a LD_PRELOAD na skrytie","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V\u00fdskumn\u00edci z firiem Intezer a BlackBerry objavili malware s k\u00f3dov\u00fdm n\u00e1zvom Simbiote, ktor\u00fd sa pou\u017e\u00edva na zav\u00e1dzanie backdoorov a rootkitov do kompromitovan\u00fdch serverov be\u017eiacich na opera\u010dnom syst\u00e9me Linux. Malware bol identifikovan\u00fd na syst\u00e9mom finan\u010dn\u00fdch in\u0161tit\u00faci\u00ed v nieko\u013ek\u00fdch krajin\u00e1ch Latinskej Ameriky. Na in\u0161tal\u00e1ciu Simbiote do syst\u00e9mu mus\u00ed \u00fato\u010dn\u00edk z\u00edska\u0165 root-pr\u00edstup, \u010do m\u00f4\u017ee by\u0165 dosiahnut\u00e9 napr\u00edklad zneu\u017eit\u00edm neopravite\u013en\u00fdch zranite\u013enost\u00ed alebo \u00fanikom prihlasovac\u00edch \u00fadajov. Simbiote umo\u017e\u0148uje udr\u017ea\u0165 si pr\u00edtomnos\u0165 v syst\u00e9me po \u00fatoku na \u010fal\u0161ie \u00fatoky, skr\u00fdvanie aktivity in\u00fdch \u0161kodliv\u00fdch aplik\u00e1ci\u00ed a organizovanie odpo\u010d\u00favania d\u00f4vern\u00fdch \u00fadajov. <\/p>\n

Zauj\u00edmavos\u0165ou Simbiote je, \u017ee sa \u0161\u00edri vo forme zdie\u013eanej kni\u017enice, ktor\u00e1 sa na\u010d\u00edtava pri sp\u00fa\u0161\u0165an\u00ed v\u0161etk\u00fdch procesov pomocou mechanizmu LD_PRELOAD a nahr\u00e1dza niektor\u00e9 volania \u0161tandardnej kni\u017enice. Spracovatelia nahraden\u00fdch volan\u00ed skr\u00fdvaj\u00fa s aktivitou backdooru s\u00favisiace aktivity, napr\u00edklad vylu\u010duj\u00fa jednotliv\u00e9 polo\u017eky zo zoznamu procesov, blokuj\u00fa pr\u00edstup k ur\u010dit\u00fdm s\u00faborom v \/proc, skr\u00fdvaj\u00fa s\u00fabory v adres\u00e1roch a vylu\u010duj\u00fa \u0161kodliv\u00fa zdie\u013ean\u00fa kni\u017enicu vo v\u00fdstupe ldd (vykon\u00e1va sa zachytenie funkcie execve a anal\u00fdza volan\u00ed s premennou prostredia LD_TRACE_LOADED_OBJECTS), neukazuj\u00fa s\u00favisiace so \u0161kodlivou aktivitou sie\u0165ov\u00e9 sokety. <\/p>\n

Na ochranu pred inspekciou prev\u00e1dzkovanej dopravy sa vykon\u00e1va predefinovanie funkci\u00ed kni\u017enice libpcap, filtrovanie \u010d\u00edtania \/proc\/net\/tcp a nahr\u00e1vanie eBPF programov do jadra, ktor\u00e9 br\u00e1nia \u010dinnosti analyz\u00e1torov prev\u00e1dzky a odmietaj\u00fa cudz\u00edch po\u017eiadaviek na vlastn\u00e9 sie\u0165ov\u00e9 spracovatele. eBPF program sa sp\u00fa\u0161\u0165a medzi prv\u00fdmi spracovate\u013emi a vykon\u00e1va sa na najni\u017e\u0161ej \u00farovni sie\u0165ov\u00e9ho z\u00e1sobn\u00edka, \u010do umo\u017e\u0148uje skry\u0165 sie\u0165ov\u00fa aktivitu backdooru, a to aj pred analyz\u00e1tormi, ktor\u00e9 s\u00fa spusten\u00e9 nesk\u00f4r. <\/p>\n

Simbiote tie\u017e umo\u017e\u0148uje ob\u00eds\u0165 niektor\u00e9 analytick\u00e9 n\u00e1stroje aktivity v s\u00faborovom syst\u00e9me, preto\u017ee kr\u00e1de\u017e citliv\u00fdch d\u00e1t m\u00f4\u017ee prebieha\u0165 nie na \u00farovni otv\u00e1rania s\u00faborov, ale prostredn\u00edctvom zachyt\u00e1vania oper\u00e1ci\u00ed \u010d\u00edtania z t\u00fdchto s\u00faborov v legit\u00edmnych aplik\u00e1ci\u00e1ch (napr\u00edklad podmienky kni\u017enicov\u00fdch funkci\u00ed umo\u017e\u0148uj\u00fa zachyti\u0165 vstup pou\u017e\u00edvate\u013eom hesla alebo d\u00e1ta na\u010d\u00edtan\u00e9 zo s\u00faboru s pr\u00edstupov\u00fdm k\u013e\u00fa\u010dom). Pre zabezpe\u010denie vzdialen\u00e9ho pr\u00edstupu Simbiote zachyt\u00e1va niektor\u00e9 volania PAM (Pluggable Authentication Module), \u010do umo\u017e\u0148uje pripoji\u0165 sa k syst\u00e9mu cez SSH s ur\u010dit\u00fdmi \u00fato\u010dn\u00fdmi prihlasovac\u00edmi \u00fadajmi. Zva\u017euje sa aj skryt\u00e1 mo\u017enos\u0165 zv\u00fd\u0161enia svojich opr\u00e1vnen\u00ed na pou\u017e\u00edvate\u013ea root prostredn\u00edctvom nastavenia premennej prostredia HTTP_SETTHIS.

\"Simbiote<\/center>
\n
Zdroj: opennet.ru<\/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\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 \u0161kodliv\u00fd softv\u00e9r pre Linux, ktor\u00fd pou\u017e\u00edva eBPF a LD_PRELOAD na skrytie | ProHoster","description":"V\u00fdskumn\u00edci z firiem Intezer a BlackBerry objavili \u0161kodliv\u00fd softv\u00e9r, ktor\u00fd dostal k\u00f3dov\u00e9 meno Simbiote a pou\u017e\u00edva sa na nasadenie backdoorov a 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