O laborat\u00f3rio de pesquisa 360 Netlab relatou a descoberta de um novo malware para Linux, codinome RotaJakiro, que inclui a implementa\u00e7\u00e3o de um backdoor que permite o controle do sistema. O malware poderia ter sido instalado por atacantes ap\u00f3s explorar vulnerabilidades n\u00e3o corrigidas no sistema ou por meio da quebra de senhas inseguras. <\/p>\n
O backdoor foi descoberto durante a an\u00e1lise de tr\u00e1fego suspeito de um dos processos do sistema, identificado ao examinar a estrutura de um botnet usado para ataques DDoS. Antes disso, o RotaJakiro permaneceu indetectado por tr\u00eas anos, sendo que as primeiras tentativas de verifica\u00e7\u00e3o no servi\u00e7o VirusTotal de arquivos com hashes MD5 correspondentes ao malware identificado datam de maio de 2018. <\/p>\n
Entre as caracter\u00edsticas do RotaJakiro, destaca-se o uso de diferentes t\u00e9cnicas de camuflagem ao ser executado com privil\u00e9gios de usu\u00e1rio n\u00e3o privilegiado e de root. Para ocultar sua presen\u00e7a, o backdoor utilizou nomes de processos como systemd-daemon, session-dbus e gvfsd-helper, que, considerando a sobrecarga de processos de sistema em distribui\u00e7\u00f5es modernas do Linux, pareciam leg\u00edtimos \u00e0 primeira vista e n\u00e3o levantavam suspeitas. <\/p>\n
Ao ser executado com privil\u00e9gios de root, para ativar o malware, foram criados scripts em \/etc\/init\/systemd-agent.conf e \/lib\/systemd\/system\/sys-temd-agent.service, enquanto o arquivo execut\u00e1vel do malware era colocado como \/bin\/systemd\/systemd-daemon e \/usr\/lib\/systemd\/systemd-daemon (a funcionalidade foi duplicada em dois arquivos). Quando executado com privil\u00e9gios de usu\u00e1rio comum, foi usado o arquivo de inicializa\u00e7\u00e3o autom\u00e1tica $HOME\/.config\/autostart\/gnomehelper.desktop, mudan\u00e7as foram feitas em .bashrc, e o execut\u00e1vel foi salvo como $HOME\/.gvfsd\/.profile\/gvfsd-helper e $HOME\/.dbus\/sessions\/session-dbus. Ambos os arquivos execut\u00e1veis eram iniciados simultaneamente, cada um monitorando a presen\u00e7a do outro e restaurando-o em caso de finaliza\u00e7\u00e3o. <\/p>\n
Para ocultar os resultados de suas atividades, o backdoor utilizava v\u00e1rios algoritmos de criptografia, por exemplo, o AES era usado para criptografia de seus recursos, e para esconder o canal de comunica\u00e7\u00e3o com o controlador servidor<\/a> utilizando uma combina\u00e7\u00e3o de AES, XOR e ROTATE em conjunto com a compress\u00e3o por meio do ZLIB. <\/p>\n Para executar comandos de gerenciamento, o malware se conectou a 4 dom\u00ednios atrav\u00e9s da porta de rede 443 (um protocolo pr\u00f3prio foi utilizado na comunica\u00e7\u00e3o, e n\u00e3o HTTPS ou TLS). Os dom\u00ednios (cdn.mirror-codes.net, status.sublineover.net, blog.eduelects.com e news.thaprior.net) foram registrados em 2015 e est\u00e3o hospedados na Deltahost em Kiev. provedor de hospedagem<\/a> No backdoor foram integradas 12 fun\u00e7\u00f5es b\u00e1sicas que permitiam carregar e executar plugins com funcionalidades expandidas, transmitir dados do dispositivo, interceptar informa\u00e7\u00f5es confidenciais e gerenciar arquivos locais. \u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u0430\u044f \u043b\u0430\u0431\u043e\u0440\u0430\u0442\u043e\u0440\u0438\u044f 360 Netlab \u0441\u043e\u043e\u0431\u0449\u0438\u043b\u0430 \u043e \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u0438 \u043d\u043e\u0432\u043e\u0433\u043e \u0432\u0440\u0435\u0434\u043e\u043d\u043e\u0441\u043d\u043e\u0433\u043e \u041f\u041e \u0434\u043b\u044f Linux, \u043f\u043e\u043b\u0443\u0447\u0438\u0432\u0448\u0435\u0433\u043e \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f RotaJakiro \u0438 \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0449\u0435\u0433\u043e \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044e \u0431\u044d\u043a\u0434\u043e\u0440\u0430, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0433\u043e \u0443\u043f\u0440\u0430\u0432\u043b\u044f\u0442\u044c \u0441\u0438\u0441\u0442\u0435\u043c\u043e\u0439. \u0412\u0440\u0435\u0434\u043e\u043d\u043e\u0441\u043d\u043e\u0435 \u041f\u041e \u043c\u043e\u0433\u043b\u043e \u0431\u044b\u0442\u044c \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u043e \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u043c\u0438 \u043f\u043e\u0441\u043b\u0435 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u043d\u0435\u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0438\u043b\u0438 \u043f\u043e\u0434\u0431\u043e\u0440\u0430 \u043d\u0435\u043d\u0430\u0434\u0451\u0436\u043d\u044b\u0445 \u043f\u0430\u0440\u043e\u043b\u0435\u0439. \u0411\u044d\u043a\u0434\u043e\u0440 \u0431\u044b\u043b \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0435\u043d \u0432 \u0445\u043e\u0434\u0435 \u0430\u043d\u0430\u043b\u0438\u0437\u0430 \u043f\u043e\u0434\u043e\u0437\u0440\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0433\u043e \u0442\u0440\u0430\u0444\u0438\u043a\u0430 \u043e\u0442 \u043e\u0434\u043d\u043e\u0433\u043e \u0438\u0437 \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u044b\u0445 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0432, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u043f\u0440\u0438 \u0440\u0430\u0437\u0431\u043e\u0440\u0435 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-100066","post","type-post","status-publish","format-standard","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\udd47RotaJakiro \u2014 novo malware para Linux, disfar\u00e7ado como processo systemd | ProHoster","description":"O laborat\u00f3rio de pesquisa 360 Netlab relatou a descoberta de um novo malware para Linux, codinome RotaJakiro, que inclui a implementa\u00e7\u00e3o de um backdoor que permite controlar o 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ProHoster","og:description":"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u0430\u044f \u043b\u0430\u0431\u043e\u0440\u0430\u0442\u043e\u0440\u0438\u044f 360 Netlab \u0441\u043e\u043e\u0431\u0449\u0438\u043b\u0430 \u043e \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u0438 \u043d\u043e\u0432\u043e\u0433\u043e \u0432\u0440\u0435\u0434\u043e\u043d\u043e\u0441\u043d\u043e\u0433\u043e \u041f\u041e \u0434\u043b\u044f Linux, \u043f\u043e\u043b\u0443\u0447\u0438\u0432\u0448\u0435\u0433\u043e \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f RotaJakiro \u0438 \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0449\u0435\u0433\u043e \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044e \u0431\u044d\u043a\u0434\u043e\u0440\u0430, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0433\u043e \u0443\u043f\u0440\u0430\u0432\u043b\u044f\u0442\u044c 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Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"