{"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\/cs\/blog\/news\/simbiote-vredonosnoe-po-dlya-linux-ispolzuyushhee-ebpf-i-ld_preload-dlya-skrytiya","title":{"rendered":"Simbiote \u2014 \u0161kodliv\u00fd software pro Linux, kter\u00fd vyu\u017e\u00edv\u00e1 eBPF a LD_PRELOAD pro skryt\u00ed","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V\u00fdzkumn\u00edci z firem Intezer a BlackBerry objevili \u0161kodliv\u00fd software s k\u00f3dov\u00fdm n\u00e1zvem Simbiote, kter\u00fd se pou\u017e\u00edv\u00e1 k nasazen\u00ed backdoor\u016f a rootkit\u016f na kompromitovan\u00fdch serverech b\u011b\u017e\u00edc\u00edch pod Linuxem. \u0160kodliv\u00fd software byl identifikov\u00e1n v syst\u00e9mech finan\u010dn\u00edch instituc\u00ed v n\u011bkolika zem\u00edch Latinsk\u00e9 Ameriky. Pro instalaci Simbiote do syst\u00e9mu mus\u00ed \u00fato\u010dn\u00edk m\u00edt root p\u0159\u00edstup, kter\u00fd lze z\u00edskat nap\u0159\u00edklad exploitac\u00ed neopraven\u00fdch zranitelnost\u00ed nebo \u00fanikem p\u0159ihla\u0161ovac\u00edch \u00fadaj\u016f. Simbiote umo\u017e\u0148uje udr\u017eet si p\u0159\u00edtomnost v syst\u00e9mu po \u00fatoku za \u00fa\u010delem prov\u00e1d\u011bn\u00ed dal\u0161\u00edch \u00fatok\u016f, skr\u00fdv\u00e1n\u00ed aktivity jin\u00fdch \u0161kodliv\u00fdch aplikac\u00ed a organizaci odposlechu citliv\u00fdch dat. <\/p>\n

Charakteristick\u00fdm rysem Simbiote je distribuce ve form\u011b sd\u00edlen\u00e9 knihovny, kter\u00e1 se na\u010d\u00edt\u00e1 b\u011bhem spu\u0161t\u011bn\u00ed v\u0161ech proces\u016f pomoc\u00ed mechanismu LD_PRELOAD a nahrazuje n\u011bkter\u00e9 v\u00fdzvy standardn\u00ed knihovny. Zpracovatel\u00e9 nahrazen\u00fdch v\u00fdzev skr\u00fdvaj\u00ed souvisej\u00edc\u00ed aktivity s backdoor, nap\u0159\u00edklad vyj\u00edmaj\u00ed jednotliv\u00e9 polo\u017eky ze seznamu proces\u016f, blokuj\u00ed p\u0159\u00edstup k ur\u010dit\u00fdm soubor\u016fm v \/proc, skr\u00fdvaj\u00ed soubory v adres\u00e1\u0159\u00edch, vyjmuj\u00ed \u0161kodlivou sd\u00edlenou knihovnu z v\u00fdstupu ldd (prov\u00e1d\u00ed se zachycen\u00ed funkce execve a anal\u00fdza v\u00fdzev s prom\u011bnnou prost\u0159ed\u00ed LD_TRACE_LOADED_OBJECTS), nezobrazuj\u00ed souvisej\u00edc\u00ed s\u00ed\u0165ov\u00e9 sokety s \u0161kodlivou aktivitou. <\/p>\n

Pro ochranu p\u0159ed inspekc\u00ed provozu doch\u00e1z\u00ed k p\u0159eps\u00e1n\u00ed funkc\u00ed knihovny libpcap, filtrov\u00e1n\u00ed \u010dten\u00ed \/proc\/net\/tcp a na\u010dten\u00ed eBPF programu do j\u00e1dra, kter\u00fd br\u00e1n\u00ed \u010dinnosti analyz\u00e1tor\u016f provozu a odm\u00edt\u00e1 extern\u00ed po\u017eadavky na vlastn\u00ed s\u00ed\u0165ov\u00e9 obsluhy. eBPF program se spou\u0161t\u00ed mezi prvn\u00edmi obsluhami a vykon\u00e1v\u00e1 se na nejni\u017e\u0161\u00ed \u00farovni s\u00ed\u0165ov\u00e9ho z\u00e1sobn\u00edku, co\u017e umo\u017e\u0148uje skr\u00fdvat s\u00ed\u0165ovou aktivitu backdooru i p\u0159ed analyz\u00e1tory spu\u0161t\u011bn\u00fdmi pozd\u011bji. <\/p>\n

Simbiote tak\u00e9 umo\u017e\u0148uje obej\u00edt n\u011bkter\u00e9 analyz\u00e1tory aktivity v souborov\u00e9m syst\u00e9mu, jeliko\u017e kr\u00e1de\u017e citliv\u00fdch dat m\u016f\u017ee prob\u00edhat nikoli na \u00farovni otev\u00edr\u00e1n\u00ed soubor\u016f, ale zachycen\u00edm operac\u00ed \u010dten\u00ed z t\u011bchto soubor\u016f v legitimn\u00edch aplikac\u00edch (nap\u0159\u00edklad p\u0159es kop\u00edrov\u00e1n\u00ed knihovn\u00edch funkc\u00ed lze zachytit zad\u00e1n\u00ed hesla u\u017eivatelem nebo na\u010d\u00edtan\u00e1 data z toho souboru s p\u0159\u00edstupov\u00fdm kl\u00ed\u010dem). Pro zaji\u0161t\u011bn\u00ed vzd\u00e1len\u00e9ho p\u0159\u00edstupu Simbiote zachycuje n\u011bkter\u00e9 vol\u00e1n\u00ed PAM (Pluggable Authentication Module), co\u017e umo\u017e\u0148uje p\u0159ipojit se k syst\u00e9mu p\u0159es SSH s ur\u010dit\u00fdmi \u00fato\u010dn\u00fdmi p\u0159ihla\u0161ovac\u00edmi \u00fadaji. Tak\u00e9 je zde skryt\u00e1 mo\u017enost zv\u00fd\u0161en\u00ed sv\u00fdch privileg\u00ed\u00ed na u\u017eivatele root prost\u0159ednictv\u00edm nastaven\u00ed prom\u011bnn\u00e9 prost\u0159ed\u00ed 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 malware pro Linux, kter\u00fd vyu\u017e\u00edv\u00e1 eBPF a LD_PRELOAD k maskov\u00e1n\u00ed | ProHoster","description":"V\u00fdzkumn\u00edci z firem Intezer a BlackBerry objevili malware pojmenovan\u00fd Simbiote, kter\u00fd se pou\u017e\u00edv\u00e1 k implementaci backdoor\u016f a rootkit\u016f na kompromitovan\u00fdch 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