{"id":91919,"date":"2020-08-20T13:41:55","date_gmt":"2020-08-20T11:41:55","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vyyavlen-cherv-fritzfrog-porazhayushhij-servery-po-ssh-i-stroyashhij-deczentralizovannyj-botnet"},"modified":"2020-08-20T13:41:55","modified_gmt":"2020-08-20T11:41:55","slug":"vyyavlen-cherv-fritzfrog-porazhayushhij-servery-po-ssh-i-stroyashhij-deczentralizovannyj-botnet","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/vyyavlen-cherv-fritzfrog-porazhayushhij-servery-po-ssh-i-stroyashhij-deczentralizovannyj-botnet","title":{"rendered":"FritzFrog f\u00e9rget tal\u00e1ltak, amely SSH-n kereszt\u00fcl t\u00e1madja a szervereket \u00e9s decentraliz\u00e1lt botnetet \u00e9p\u00edt.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>A Guardicore c\u00e9g, amely adatk\u00f6zpontok \u00e9s felh\u0151alap\u00fa rendszerek v\u00e9delm\u00e9re specializ\u00e1l\u00f3dott, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.guardicore.com\/2020\/08\/fritzfrog-p2p-botnet-infects-ssh-servers\/\">felt\u00e1rta<\/a><\/noindex> \u00faj, high-tech FritzFrog k\u00e1rtev\u0151t azonos\u00edtott, amely Linux alap\u00fa szervereket c\u00e9loz meg. A FritzFrog egy f\u00e9rg, amely bruteforce t\u00e1mad\u00e1sokkal terjed a nyitott SSH porttal rendelkez\u0151 szervereken, \u00e9s tartalmaz decentraliz\u00e1lt botnet \u00e9p\u00edt\u00e9s\u00e9re szolg\u00e1l\u00f3 komponenseket, amelyek ir\u00e1ny\u00edt\u00f3 csom\u00f3pontok n\u00e9lk\u00fcl m\u0171k\u00f6dnek \u00e9s nincsenek egyetlen hibapontjuk.<\/p>\n<p>A botnet \u00e9p\u00edt\u00e9s\u00e9hez saj\u00e1t P2P protokollt alkalmaz, amelyben a csom\u00f3pontok egym\u00e1ssal kommunik\u00e1lnak, koordin\u00e1lj\u00e1k a t\u00e1mad\u00e1sok szervez\u00e9s\u00e9t, fenntartj\u00e1k a h\u00e1l\u00f3zat m\u0171k\u00f6d\u00e9s\u00e9t \u00e9s ellen\u0151rzik egym\u00e1s \u00e1llapot\u00e1t. Az \u00faj \u00e1ldozatokat bruteforce t\u00e1mad\u00e1sokkal tal\u00e1lj\u00e1k meg a SSH k\u00e9rd\u00e9seket fogad\u00f3 szervereken. Amikor egy \u00faj szervert felfedeznek, a tipikus felhaszn\u00e1l\u00f3n\u00e9v \u00e9s jelsz\u00f3 kombin\u00e1ci\u00f3kb\u00f3l \u00e1ll\u00f3 sz\u00f3t\u00e1r alapon v\u00e9geznek tesztel\u00e9st. Az ir\u00e1ny\u00edt\u00e1s b\u00e1rmely csom\u00f3ponton kereszt\u00fcl t\u00f6rt\u00e9nhet, ami megnehez\u00edti a botnet oper\u00e1torainak azonos\u00edt\u00e1s\u00e1t \u00e9s blokkol\u00e1s\u00e1t.<\/p>\n<p>A kutat\u00f3k szerint a botnet m\u00e1r k\u00f6r\u00fclbel\u00fcl 500 csom\u00f3pontb\u00f3l \u00e1ll, amelyek k\u00f6z\u00f6tt t\u00f6bb egyetem \u00e9s egy nagy vas\u00fatt\u00e1rsas\u00e1g szerverei is szerepelnek. Megfigyelt\u00e9k, hogy a t\u00e1mad\u00e1sok f\u0151 c\u00e9lpontjai az oktat\u00e1si int\u00e9zm\u00e9nyek, orvosi k\u00f6zpontok, \u00e1llami int\u00e9zm\u00e9nyek, bankok \u00e9s telekommunik\u00e1ci\u00f3s c\u00e9gek h\u00e1l\u00f3zatai. A szerver kompromitt\u00e1l\u00e1sa ut\u00e1n Monero kriptovaluta b\u00e1ny\u00e1szatot ind\u00edtanak el rajta. A vizsg\u00e1lt k\u00e1rtev\u0151 aktivit\u00e1sa 2020 janu\u00e1rja \u00f3ta nyomon k\u00f6vethet\u0151.<\/p>\n<p>A FritzFrog saj\u00e1toss\u00e1ga, hogy minden adatot \u00e9s v\u00e9grehajthat\u00f3 k\u00f3dot csak a mem\u00f3ri\u00e1ban t\u00e1rol. A lemezen t\u00f6rt\u00e9n\u0151 m\u00f3dos\u00edt\u00e1sok csak annyira korl\u00e1toz\u00f3dnak, hogy \u00faj SSH kulcsot adnak hozz\u00e1 az authorized_keys f\u00e1jlhoz, amelyet k\u00e9s\u0151bb a szerverhez val\u00f3 hozz\u00e1f\u00e9r\u00e9shez haszn\u00e1lnak. A rendszerf\u00e1jlok nem m\u00f3dosulnak, ami a f\u00e9rget \u00e9szlelhetetlenn\u00e9 teszi a hash ellen\u0151rz\u00e9seket v\u00e9gz\u0151 rendszerek sz\u00e1m\u00e1ra. A mem\u00f3ri\u00e1ban a jelsz\u00f3megold\u00e1sokhoz sz\u00f3t\u00e1rak \u00e9s b\u00e1ny\u00e1szat adatai is tal\u00e1lhat\u00f3k, amelyek a P2P protokollon kereszt\u00fcl szinkroniz\u00e1l\u00f3dnak a csom\u00f3pontok k\u00f6z\u00f6tt.<\/p>\n<p>A k\u00e1rt\u00e9kony komponensek az &#171;ifconfig&#187;, &#171;libexec&#187;, &#171;php-fpm&#187; \u00e9s &#171;nginx&#187; folyamatok m\u00f6g\u00e9 rejt\u0151znek. A botnet csom\u00f3pontok figyelik a szomsz\u00e9dokat, \u00e9s a szerver \u00fajraind\u00edt\u00e1sa vagy ak\u00e1r az oper\u00e1ci\u00f3s rendszer \u00fajratelep\u00edt\u00e9se eset\u00e9n (ha az \u00faj rendszerbe \u00e1tvitt\u00e9k a m\u00f3dos\u00edtott authorized_keys f\u00e1jlt) ism\u00e9t aktiv\u00e1lj\u00e1k a k\u00e1rt\u00e9kony komponenseket a gazda rendszer\u00e9n. A kommunik\u00e1ci\u00f3hoz a szok\u00e1sos SSH-t haszn\u00e1lj\u00e1k - a k\u00e1rt\u00e9kony program egy helyi &#171;netcat&#187; alkalmaz\u00e1st is ind\u00edt, amely a localhost interf\u00e9szhez k\u00f6t\u0151dik \u00e9s a 1234-es porton hallgatja a forgalmat, amelyhez a k\u00fcls\u0151 csom\u00f3pontok SSH-alag\u00faton kereszt\u00fcl csatlakoznak, a kapcsolat l\u00e9trehoz\u00e1s\u00e1hoz az authorized_keys-b\u00f3l sz\u00e1rmaz\u00f3 kulcsot haszn\u00e1lva.<br \/>\n<center><noindex><a rel=\"nofollow\" href=\"https:\/\/www.guardicore.com\/wp-content\/uploads\/2020\/08\/frog-attack-1030x601.jpg\"><img decoding=\"async\" alt=\"FritzFrog f\u00e9rget tal\u00e1ltak, amely SSH-n kereszt\u00fcl t\u00e1madja a szervereket \u00e9s decentraliz\u00e1lt botnetet \u00e9p\u00edt.\" src=\"\/wp-content\/uploads\/2020\/08\/485d97de035ae93d10692d8934702264.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p> A FritzFrog \u00f6sszetev\u0151k k\u00f3dja Go nyelven \u00edr\u00f3dott \u00e9s sz\u00e1lakban m\u0171k\u00f6dik. A k\u00e1rt\u00e9kony szoftver t\u00f6bb modult tartalmaz, amelyeket k\u00fcl\u00f6nb\u00f6z\u0151 sz\u00e1lakban ind\u00edt:<\/p>\n<ul>\n<li class=\"l\"> A cracker - a t\u00e1madott szervereken v\u00e9grehajtja a jelszavak kital\u00e1l\u00e1s\u00e1t.\n<li class=\"l\"> CryptoComm + Parser - titkos\u00edtott P2P kapcsolatot hoz l\u00e9tre.\n<li class=\"l\"> CastVotes - a c\u00e9lh\u00e1l\u00f3zatok k\u00f6z\u00f6s kiv\u00e1laszt\u00e1s\u00e1nak mechanizmusa a t\u00e1mad\u00e1shoz.\n<li class=\"l\"> TargetFeed - a szomsz\u00e9dos csom\u00f3pontokt\u00f3l megszerzi a t\u00e1mad\u00e1sokhoz sz\u00fcks\u00e9ges csom\u00f3pontok list\u00e1j\u00e1t.\n<li class=\"l\"> DeployMgmt - a f\u00e9reg v\u00e9grehajt\u00e1sa, amely k\u00e1rt\u00e9kony k\u00f3dot terjeszt a felt\u00f6rt szerveren.\n<li class=\"l\"> Owned - a csatlakoz\u00e1s\u00e9rt felel\u0151s a m\u00e1r k\u00e1rt\u00e9kony k\u00f3dot futtat\u00f3 szerverekhez.\n<li class=\"l\"> Assemble - a f\u00e1jl mem\u00f3ri\u00e1ban t\u00f6rt\u00e9n\u0151 \u00f6ssze\u00e1ll\u00edt\u00e1sa elk\u00fcl\u00f6n\u00edtett blokkokb\u00f3l.\n<li class=\"l\"> Antivir - a konkur\u00e1l\u00f3 k\u00e1rt\u00e9kony programok elnyom\u00e1s\u00e1\u00e9rt felel\u0151s modul, amely meghat\u00e1rozza \u00e9s le\u00e1ll\u00edtja az &#171;xmr&#187; karakterl\u00e1ncot tartalmaz\u00f3 folyamatokat, amelyek CPU er\u0151forr\u00e1sokat haszn\u00e1lnak.\n<li class=\"l\"> Libexec - a Monero kriptovaluta b\u00e1ny\u00e1szat\u00e1hoz sz\u00fcks\u00e9ges modul.\n<\/ul>\n<p>A FritzFrog \u00e1ltal alkalmazott P2P protokoll k\u00f6r\u00fclbel\u00fcl 30 parancsot t\u00e1mogat, amelyek az adatok \u00e1tvitel\u00e9\u00e9rt, szkriptek futtat\u00e1s\u00e1\u00e9rt, a k\u00e1rt\u00e9kony \u00f6sszetev\u0151k \u00e1tvitel\u00e9\u00e9rt, \u00e1llapotlek\u00e9rdez\u00e9s\u00e9rt, napl\u00f3z\u00e1s\u00e9rt, proxy ind\u00edt\u00e1s\u00e1\u00e9rt stb. felel\u0151sek. Az inform\u00e1ci\u00f3k egy k\u00fcl\u00f6n titkos\u00edtott csatorn\u00e1n kereszt\u00fcl ker\u00fclnek \u00e1tvitelre JSON form\u00e1tumban t\u00f6rt\u00e9n\u0151 sorozatba \u00e1ll\u00edt\u00e1ssal. Az AES aszimmetrikus k\u00f3dot \u00e9s Base64 k\u00f3dol\u00e1st haszn\u00e1lnak a titkos\u00edt\u00e1shoz. A kulcscsere a DH protokollt haszn\u00e1lja (<noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Diffie%E2%80%93Hellman_key_exchange\">Diffie-Hellman<\/a><\/noindex>). Az \u00e1llapot meghat\u00e1roz\u00e1s\u00e1ra a csom\u00f3pontok folyamatosan ping k\u00e9r\u00e9seket cser\u00e9lnek. <\/p>\n<p>A botnet minden csom\u00f3pontja egy elosztott adatb\u00e1zist t\u00e1mogat a t\u00e1madott \u00e9s kompromitt\u00e1lt rendszerekkel kapcsolatos inform\u00e1ci\u00f3kkal. A t\u00e1mad\u00e1si c\u00e9lok szinkroniz\u00e1l\u00f3dnak az eg\u00e9sz botneten - minden csom\u00f3pont k\u00fcl\u00f6n c\u00e9lt t\u00e1mad, azaz k\u00e9t k\u00fcl\u00f6nb\u00f6z\u0151 botnet csom\u00f3pont nem t\u00e1madja meg ugyanazt a gazdag\u00e9pet. A csom\u00f3pontok emellett gy\u0171jtenek \u00e9s \u00e1tadnak szomsz\u00e9daiknak helyi statisztik\u00e1kat, p\u00e9ld\u00e1ul a szabad mem\u00f3ria m\u00e9ret\u00e9t, a fut\u00e1si id\u0151t, a CPU terhelts\u00e9g\u00e9t \u00e9s az SSH kapcsolatok aktivit\u00e1s\u00e1t. Ezen inform\u00e1ci\u00f3k alapj\u00e1n d\u00f6ntenek arr\u00f3l, hogy b\u00e1ny\u00e1szatot ind\u00edtanak-e, vagy a csom\u00f3pontot csak m\u00e1s rendszerek megt\u00e1mad\u00e1s\u00e1ra haszn\u00e1lj\u00e1k (p\u00e9ld\u00e1ul b\u00e1ny\u00e1szatot nem ind\u00edtanak leterhelt rendszereken vagy gyakran adminisztr\u00e1tor \u00e1ltal csatlakoz\u00f3 rendszereken).<\/p>\n<p>A FritzFrog felfedez\u00e9s\u00e9hez a kutat\u00f3k egy egyszer\u0171 <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/guardicore\/labs_campaigns\/blob\/master\/FritzFrog\/detect_fritzfrog.sh\">shell-szkriptet<\/a><\/noindex>javasoltak. A rendszer kompromitt\u00e1lts\u00e1g\u00e1nak meghat\u00e1roz\u00e1s\u00e1hoz<br \/>\nolyan jelek haszn\u00e1lhat\u00f3k, mint az 1234-es porton l\u00e9v\u0151 hallgat\u00f3 kapcsolat jelenl\u00e9te, illetve a <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/guardicore\/labs_campaigns\/blob\/master\/FritzFrog\/ssh_key.md\">rosszindulat\u00fa kulcs<\/a><\/noindex> Az authorized_keys-ben (minden csom\u00f3ponton azonos SSH-kulcs van be\u00e1ll\u00edtva) \u00e9s a mem\u00f3ri\u00e1ban fut\u00f3 folyamatok mint az &#171;ifconfig&#187;, &#171;libexec&#187;, &#171;php-fpm&#187; \u00e9s &#171;nginx&#187; jelenl\u00e9te, amelyeknek nincs kapcsol\u00f3d\u00f3 v\u00e9grehajthat\u00f3 f\u00e1jlja (&#171;\\\/proc\\\/\\\/exe&#187; t\u00e1vols\u00e1gi f\u00e1jlra mutat). Tov\u00e1bb\u00e1 jelezheti a 5555-\u00f6s h\u00e1l\u00f3zati porton l\u00e9v\u0151 forgalom, amely a web.xmrpool.eu t\u00edpus\u00fa poolhoz val\u00f3 hozz\u00e1f\u00e9r\u00e9skor jelentkezik Monero kriptovaluta b\u00e1ny\u00e1szat sor\u00e1n.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Forr\u00e1s: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=53573\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Guardicore, \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u0438\u0437\u0438\u0440\u0443\u044e\u0449\u0430\u044f\u0441\u044f \u043d\u0430 \u0437\u0430\u0449\u0438\u0442\u0435 \u0434\u0430\u0442\u0430\u0446\u0435\u043d\u0442\u0440\u043e\u0432 \u0438 \u043e\u0431\u043b\u0430\u0447\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c, \u0432\u044b\u044f\u0432\u0438\u043b\u0430 \u043d\u043e\u0432\u043e\u0435 \u0432\u044b\u0441\u043e\u043a\u043e\u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0447\u043d\u043e\u0435 \u0432\u0440\u0435\u0434\u043e\u043d\u043e\u0441\u043d\u043e\u0435 \u041f\u041e FritzFrog, \u043f\u043e\u0440\u0430\u0436\u0430\u044e\u0449\u0435\u0435 \u0441\u0435\u0440\u0432\u0435\u0440\u044b \u043d\u0430 \u0431\u0430\u0437\u0435 Linux. FritzFrog \u0441\u043e\u0447\u0435\u0442\u0430\u0435\u0442 \u0432 \u0441\u0435\u0431\u0435 \u0447\u0435\u0440\u0432\u044c, \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u044e\u0449\u0438\u0439\u0441\u044f \u0447\u0435\u0440\u0435\u0437 bruteforce-\u0430\u0442\u0430\u043a\u0443 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u044b \u0441 \u043e\u0442\u043a\u0440\u044b\u0442\u044b\u043c \u043f\u043e\u0440\u0442\u043e\u043c SSH, \u0438 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u044b \u0434\u043b\u044f \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u0438\u044f \u0434\u0435\u0446\u0435\u043d\u0442\u0440\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u0431\u043e\u0442\u043d\u0435\u0442\u0430, \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0435\u0433\u043e \u0431\u0435\u0437 \u0443\u043f\u0440\u0430\u0432\u043b\u044f\u044e\u0449\u0438\u0445 \u0443\u0437\u043b\u043e\u0432 \u0438 \u043d\u0435 \u0438\u043c\u0435\u044e\u0449\u0435\u0433\u043e \u0435\u0434\u0438\u043d\u043e\u0439 \u0442\u043e\u0447\u043a\u0438 \u043e\u0442\u043a\u0430\u0437\u0430. \u0414\u043b\u044f \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u0438\u044f \u0431\u043e\u0442\u043d\u0435\u043d\u0442\u0430 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f \u0441\u043e\u0431\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u0439 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":91920,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-91919","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f 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