{"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\/hr\/blog\/news\/simbiote-vredonosnoe-po-dlya-linux-ispolzuyushhee-ebpf-i-ld_preload-dlya-skrytiya","title":{"rendered":"Simbiote \u2014 zlo\u0107udni softver za Linux, koji koristi eBPF i LD_PRELOAD za skrivanje","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Istra\u017eiva\u010di iz kompanija Intezer i BlackBerry otkrili su zlonamjerni softver kodnog imena Simbiote, koji se koristi za uvo\u0111enje backdoor-a i rootkit-ova na kompromitirane servere koji rade pod operativnim sustavom Linux. Zlonamjerni softver otkriven je na sustavima financijskih institucija u raznim zemljama Latinske Amerike. Da bi napada\u010d instalirao Simbiote u sustav, potrebno je imati root-pristup, koji se mo\u017ee dobiti, na primjer, iskori\u0161tavanjem neispravnih ranjivosti ili curenjem korisni\u010dkih ra\u010duna. Simbiote omogu\u0107uje osiguravanje prisutnosti u sustavu nakon provale radi izvo\u0111enja daljih napada, skrivanja aktivnosti drugih zlonamjernih aplikacija i organizacije presretanja povjerljivih podataka. <\/p>\n

Osobitost Simbiote je njegova distribucija u obliku dijeljene biblioteke koja se u\u010ditava prilikom pokretanja svih procesa pomo\u0107u mehanizma LD_PRELOAD i zamjenjuje neke pozive standardne biblioteke. Obrada zamijenjenih poziva skriva povezanost s backdoor aktivno\u0161\u0107u, na primjer, isklju\u010duje odre\u0111ene elemente s popisa procesa, blokira pristup odre\u0111enim datotekama u \/proc, skriva datoteke u direktorijima, isklju\u010duje zlonamjernu dijeljenu biblioteku iz ispisa ldd (provodi se presretanje funkcije execve i analiza poziva s varijablom okru\u017eenja LD_TRACE_LOADED_OBJECTS), ne prikazuje povezane mre\u017ene sokete sa zlonamjernom aktivno\u0161\u0107u. <\/p>\n

Za za\u0161titu od inspekcije prometa provodi se predefiniranje funkcija biblioteke libpcap, filtriranje \u010ditanja \/proc\/net\/tcp i u\u010ditavanje eBPF programa u kernel, koji sprje\u010dava rad analizatora prometa i odbacuje vanjske zahtjeve prema vlastitim mre\u017enim obrtnicima. eBPF program pokre\u0107e se me\u0111u prvima i izvr\u0161ava se na najni\u017eoj razini mre\u017enog stoga, \u0161to omogu\u0107uje skrivanje mre\u017ene aktivnosti backdoora \u010dak i od analizatora koji su pokrenuti kasnije. <\/p>\n

Simbiote tako\u0111er omogu\u0107uje zaobila\u017eenje odre\u0111enih analizatora aktivnosti u datote\u010dnom sustavu, budu\u0107i da kra\u0111a povjerljivih podataka mo\u017ee biti provedena ne na razini otvaranja datoteka, ve\u0107 putem presretanja operacija \u010ditanja iz tih datoteka u legitimnim aplikacijama (na primjer, zamjena funkcija knji\u017enica omogu\u0107uje presretanje unosa lozinke od strane korisnika ili podataka preuzetih iz datoteke s pristupnim klju\u010dem). Za organizaciju udaljenog pristupa, Simbiote presre\u0107e neke PAM pozive (Pluggable Authentication Module), \u0161to omogu\u0107uje povezivanje sa sustavom putem SSH s odre\u0111enim napada\u010dkim vjerodajnicama. Predvi\u0111ena je tako\u0111er skrivena mogu\u0107nost pove\u0107anja svojih privilegija na korisnika root putem postavljanja varijable okru\u017eenja HTTP_SETTHIS.

\"Simbiote<\/center>
\n
Izvor: 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 zlonamjerni softver za Linux koji koristi eBPF i LD_PRELOAD za skrivanje | ProHoster","description":"Istra\u017eiva\u010di iz kompanija Intezer i BlackBerry otkrili su zlonamjerni softver koji je dobio kodno ime Simbiote i koristi se za implantaciju backdoor-a i rootkitova na kompromitirane servere koji rade pod 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