{"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\/sv\/blog\/news\/simbiote-vredonosnoe-po-dlya-linux-ispolzuyushhee-ebpf-i-ld_preload-dlya-skrytiya","title":{"rendered":"Simbiote \u2014 skadlig programvara f\u00f6r Linux som anv\u00e4nder eBPF och LD_PRELOAD f\u00f6r att d\u00f6lja sig","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Forskare fr\u00e5n f\u00f6retagen Intezer och BlackBerry har uppt\u00e4ckt skadlig programvara med kodnamnet Simbiote, som anv\u00e4nds f\u00f6r att inf\u00f6ra bakd\u00f6rrar och rootkits p\u00e5 komprometterade servrar som k\u00f6r Linux. Den skadliga programvaran har identifierats i system hos finansinstitut i flera l\u00e4nder i Latinamerika. F\u00f6r att installera Simbiote i systemet m\u00e5ste angriparen ha root-\u00e5komst, vilket kan uppn\u00e5s genom att utnyttja obotade s\u00e5rbarheter eller genom att stj\u00e4la anv\u00e4ndarkonton. Simbiote g\u00f6r det m\u00f6jligt att etablera en permanent n\u00e4rvaro i systemet efter en attack f\u00f6r att m\u00f6jligg\u00f6ra ytterligare attacker, d\u00f6lja aktiviteten hos andra skadliga applikationer och organisera avlyssning av konfidentiell information. <\/p>\n

En s\u00e4rskild egenskap hos Simbiote \u00e4r att den sprids i form av ett delat bibliotek som laddas vid start av alla processer med hj\u00e4lp av mekanismen LD_PRELOAD och ers\u00e4tter vissa anrop i standardbiblioteket. Hanterarna av de ersatta anropen d\u00f6ljer aktiviteten relaterad till bakd\u00f6rren, till exempel genom att utesluta vissa objekt i processlistan, blockera \u00e5tkomst till specifika filer i \/proc, d\u00f6lja filer i katalogerna, utesluta den skadliga delade biblioteket fr\u00e5n utdata av ldd (genom att f\u00e5nga execve-funktionen och analysera anrop med milj\u00f6variabeln LD_TRACE_LOADED_OBJECTS), samt genom att inte visa n\u00e4tverksocket relaterade till den skadliga aktiviteten. <\/p>\n

F\u00f6r att skydda mot inspektion av trafik omdirigeras funktioner i biblioteket libpcap, l\u00e4sning av \/proc\/net\/tcp filtreras och en eBPF-program laddas in i k\u00e4rnan, vilket f\u00f6rhindrar trafikanalysatorers arbete och undertrycker externa f\u00f6rfr\u00e5gningar till egna n\u00e4tverksbehandlare. eBPF-programmet k\u00f6rs som en av de f\u00f6rsta hanterarna och exekveras p\u00e5 den l\u00e4gsta niv\u00e5n av n\u00e4tverksstacken, vilket g\u00f6r det m\u00f6jligt att d\u00f6lja n\u00e4tverksaktiviteten hos bakd\u00f6rren \u00e4ven f\u00f6r analysverktyg som k\u00f6rs senare. <\/p>\n

Simbiote till\u00e5ter ocks\u00e5 att kringg\u00e5 vissa aktivitetsanalysatorer i filsystemet, eftersom st\u00f6ld av konfidentiella uppgifter kan ske inte p\u00e5 fil\u00f6ppningsniv\u00e5, utan genom att avlyssna l\u00e4sningsoperationer fr\u00e5n dessa filer i legitima applikationer (till exempel, genom att ers\u00e4tta bibliotekfunktioner kan man avlyssna anv\u00e4ndarens inmatning av l\u00f6senord eller data som laddas fr\u00e5n filen med \u00e5tkomstnyckeln). F\u00f6r att organisera fj\u00e4rrinloggning avlyssnar Simbiote vissa PAM-anrop (Pluggable Authentication Module), vilket g\u00f6r det m\u00f6jligt att ansluta till systemet via SSH med specifika attackerande inloggningsuppgifter. Det finns ocks\u00e5 en dold m\u00f6jlighet att h\u00f6ja sina privilegier till anv\u00e4ndaren root genom att st\u00e4lla in milj\u00f6variabeln HTTP_SETTHIS.

\"Simbiote<\/center>
\n
K\u00e4lla: 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 skadlig programvara f\u00f6r Linux som anv\u00e4nder eBPF och LD_PRELOAD f\u00f6r att d\u00f6lja sig | ProHoster","description":"Forskare fr\u00e5n f\u00f6retagen Intezer och BlackBerry har uppt\u00e4ckt skadlig programvara med kodnamnet Simbiote, som anv\u00e4nds f\u00f6r att inf\u00f6ra bakd\u00f6rrar och rootkits p\u00e5 komprometterade servrar som k\u00f6rs p\u00e5.","canonical_url":"https:\/\/prohoster.info\/sv\/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":"sv_SE","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 \u0441\u043a\u0440\u044b\u0442\u0438\u044f | ProHoster","og:description":"\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 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