{"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\/hu\/blog\/news\/simbiote-vredonosnoe-po-dlya-linux-ispolzuyushhee-ebpf-i-ld_preload-dlya-skrytiya","title":{"rendered":"Simbiote \u2014 a malicious software for Linux that uses eBPF and LD_PRELOAD for concealment","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A kutat\u00f3k az Intezer \u00e9s a BlackBerry c\u00e9gekt\u0151l felfedezt\u00e9k a Simbiote k\u00f3dn\u00e9ven ismert k\u00e1rt\u00e9kony szoftvert, amely backdoorok \u00e9s rootkite-k telep\u00edt\u00e9s\u00e9re szolg\u00e1l a Linux oper\u00e1ci\u00f3s rendszert futtat\u00f3 kompromitt\u00e1lt szerverekre. A k\u00e1rt\u00e9kony szoftvert t\u00f6bb latin-amerikai orsz\u00e1g p\u00e9nz\u00fcgyi int\u00e9zm\u00e9nyeinek rendszerein azonos\u00edtott\u00e1k. A Simbiote telep\u00edt\u00e9s\u00e9hez a t\u00e1mad\u00f3nak root-hozz\u00e1f\u00e9r\u00e9ssel kell rendelkeznie, amelyet p\u00e9ld\u00e1ul nem jav\u00edtott sebezhet\u0151s\u00e9gek kihaszn\u00e1l\u00e1s\u00e1val vagy hiteles\u00edt\u0151 adatok kisziv\u00e1rg\u00e1s\u00e1val lehet megszerezni. A Simbiote lehet\u0151v\u00e9 teszi a rendszerben val\u00f3 jelenl\u00e9t meger\u0151s\u00edt\u00e9s\u00e9t a hackel\u00e9s ut\u00e1n, a tov\u00e1bbi t\u00e1mad\u00e1sok v\u00e9grehajt\u00e1s\u00e1hoz, m\u00e1s k\u00e1rt\u00e9kony alkalmaz\u00e1sok tev\u00e9kenys\u00e9g\u00e9nek elfed\u00e9s\u00e9hez \u00e9s bizalmas adatok megszerz\u00e9s\u00e9hez. <\/p>\n

A Simbiote jellemz\u0151je, hogy megosztott k\u00f6nyvt\u00e1r form\u00e1j\u00e1ban terjed, amelyet a folyamatok ind\u00edt\u00e1sakor az LD_PRELOAD mechanizmus seg\u00edts\u00e9g\u00e9vel t\u00f6ltenek be, \u00e9s helyettes\u00edt bizonyos standard k\u00f6nyvt\u00e1rh\u00edv\u00e1sokat. A helyettes\u00edtett h\u00edv\u00e1sok kezel\u0151i elrejtik a backdoorhoz kapcsol\u00f3d\u00f3 tev\u00e9kenys\u00e9geket, p\u00e9ld\u00e1ul kiz\u00e1rj\u00e1k a folyamatlista egyes elemeit, blokkolj\u00e1k bizonyos f\u00e1jlok el\u00e9r\u00e9s\u00e9t a \/proc \u00fatvonalon, elrejtik a f\u00e1jlokat a k\u00f6nyvt\u00e1rakban, kiz\u00e1rj\u00e1k a k\u00e1rt\u00e9kony megosztott k\u00f6nyvt\u00e1rat az ldd kimenet\u00e9ben (a funkci\u00f3 execve lehallgat\u00e1s\u00e1nak \u00e9s az LD_TRACE_LOADED_OBJECTS k\u00f6rnyezeti v\u00e1ltoz\u00f3val kapcsolatos h\u00edv\u00e1sok elemz\u00e9s\u00e9nek seg\u00edts\u00e9g\u00e9vel), \u00e9s nem mutatj\u00e1k a k\u00e1rt\u00e9kony tev\u00e9kenys\u00e9gekhez kapcsol\u00f3d\u00f3 h\u00e1l\u00f3zati socketeket. <\/p>\n

A forgalom megfigyel\u00e9s\u00e9nek megakad\u00e1lyoz\u00e1sa \u00e9rdek\u00e9ben a libpcap k\u00f6nyvt\u00e1r funkci\u00f3it fel\u00fcl\u00edrj\u00e1k, sz\u0171rik a \/proc\/net\/tcp olvas\u00e1s\u00e1t \u00e9s bet\u00f6ltenek egy eBPF-programot a kernelbe, amely megakad\u00e1lyozza a forgalomelemz\u0151k m\u0171k\u00f6d\u00e9s\u00e9t, \u00e9s elutas\u00edtja a k\u00fcls\u0151 k\u00e9r\u00e9seket a saj\u00e1t h\u00e1l\u00f3zati feldolgoz\u00f3ikhoz. Az eBPF-program az els\u0151 feldolgoz\u00f3k k\u00f6z\u00f6tt indul el, \u00e9s a h\u00e1l\u00f3zati verem legalacsonyabb szintj\u00e9n hajt\u00f3dik v\u00e9gre, ami lehet\u0151v\u00e9 teszi a backdoor h\u00e1l\u00f3zati tev\u00e9kenys\u00e9g\u00e9nek elrejt\u00e9s\u00e9t, bele\u00e9rtve a k\u00e9s\u0151bb ind\u00edtott forgalomelemz\u0151k el\u0151l is. <\/p>\n

A Simbiote lehet\u0151v\u00e9 teszi a f\u00e1jlrendszer-aktivit\u00e1s elemz\u0151k megker\u00fcl\u00e9s\u00e9t is, mivel a bizalmas adatok ellop\u00e1sa nem a f\u00e1jlok megnyit\u00e1s\u00e1nak szintj\u00e9n, hanem a legitim alkalmaz\u00e1sokb\u00f3l a f\u00e1jlok olvas\u00e1si m\u0171veleteinek elfog\u00e1s\u00e1val val\u00f3sulhat meg (p\u00e9ld\u00e1ul a k\u00f6nyvt\u00e1ri funkci\u00f3k helyettes\u00edt\u00e9se lehet\u0151v\u00e9 teszi a felhaszn\u00e1l\u00f3i jelsz\u00f3 be\u00edr\u00e1s\u00e1nak vagy az el\u00e9r\u00e9si kulccsal bet\u00f6lt\u00f6tt f\u00e1jl adatoknak az elfog\u00e1s\u00e1t). A t\u00e1voli bejelentkez\u00e9s lebonyol\u00edt\u00e1s\u00e1hoz a Simbiote n\u00e9h\u00e1ny PAM-h\u00edv\u00e1st (Pluggable Authentication Module) elfog, ami lehet\u0151v\u00e9 teszi, hogy SSH-n kereszt\u00fcl kapcsol\u00f3djunk a rendszerhez egy bizonyos t\u00e1mad\u00f3 felhaszn\u00e1l\u00f3i adataival. Emellett rejtett lehet\u0151s\u00e9get biztos\u00edt jogosults\u00e1gaink root felhaszn\u00e1l\u00f3ra t\u00f6rt\u00e9n\u0151 emel\u00e9s\u00e9re az HTTP_SETTHIS k\u00f6rnyezeti v\u00e1ltoz\u00f3 be\u00e1ll\u00edt\u00e1s\u00e1n kereszt\u00fcl.

\"A<\/center>
\n
Forr\u00e1s: 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\udd47A Simbiote egy Linux k\u00e1rtev\u0151, amely eBPF \u00e9s LD_PRELOAD haszn\u00e1lat\u00e1val rejt\u0151zik | ProHoster","description":"Az Intezer \u00e9s a BlackBerry kutat\u00f3i felfedezt\u00e9k a k\u00e1rtev\u0151t, amelynek k\u00f3dneve Simbiote, \u00e9s amelyet h\u00e1ts\u00f3 ajt\u00f3k \u00e9s rootkit-ek be\u00fcltet\u00e9s\u00e9re haszn\u00e1lnak kompromitt\u00e1lt szerverekre, amelyek Linux rendszeren futnak.","canonical_url":"https:\/\/prohoster.info\/hu\/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":"hu_HU","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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