{"id":1497,"date":"2021-11-10T15:03:50","date_gmt":"2021-11-10T07:03:50","guid":{"rendered":"https:\/\/blog.billows.com.tw\/?p=1497"},"modified":"2021-11-10T15:21:55","modified_gmt":"2021-11-10T07:21:55","slug":"clop-%e5%8b%92%e7%b4%a2%e8%bb%9f%e9%ab%94%e6%94%bb%e6%93%8a%e6%bf%80%e5%a2%9e%ef%bc%8c%e9%8e%96%e5%ae%9aserv-u%e8%bb%9f%e9%ab%94%e7%9a%84%e5%ae%89%e5%85%a8%e6%bc%8f%e6%b4%9e-cve-2021-35211","status":"publish","type":"post","link":"https:\/\/blog.billows.com.tw\/?p=1497","title":{"rendered":"Clop \u52d2\u7d22\u8edf\u9ad4\u653b\u64ca\u6fc0\u589e\uff0c\u9396\u5b9aServ-U\u8edf\u9ad4\u7684\u5b89\u5168\u6f0f\u6d1e CVE-2021-35211"},"content":{"rendered":"\n<p><a href=\"https:\/\/research.nccgroup.com\/2021\/11\/08\/ta505-exploits-solarwinds-serv-u-vulnerability-cve-2021-35211-for-initial-access\/\">NCC Group<\/a>\u7684\u7814\u7a76\u4eba\u54e1\u767c\u73fe\uff0c\u64cd\u4f5cClop\u52d2\u7d22\u8edf\u9ad4\u99ed\u5ba2\u7d44\u7e54\uff08\u4e5f\u7a31\u70baTA505\u548cFIN11\uff09\u6b63\u5728\u7a4d\u6975\u6027\u5229\u7528 SolarWinds \u7684Serv-U \u6f0f\u6d1eCVE-2021-35211\u7834\u58de\u4f01\u696d\u7db2\u8def\u4e26\u6700\u7d42\u5c0d\u8a2d\u5099\u9032\u884c\u52a0\u5bc6\u3002CVE-2021-35211\u5b58\u5728\u65bc SolarWinds \u7684 Serv-U \u7522\u54c1\u4e2d\uff0c\u7576Serv-U\u7684 SSH \u66b4\u9732\u5728 Internet \u4e0a\u6642\uff0c\u8a72\u6f0f\u6d1e\u5c07\u5141\u8a31\u99ed\u5ba2\u4ee5\u7279\u6b0a\u57f7\u884c\u4efb\u610f\u7a0b\u5f0f\uff0c\u99ed\u5ba2\u53ef\u5b89\u88dd\u548c\u904b\u884c\u60e1\u610fpayloads\uff0c\u6216\u67e5\u770b\u548c\u66f4\u6539\u6578\u64da\u7b49\u64cd\u4f5c\u3002SolarWinds\u65bc2021\u5e747\u6708\u767c\u5e03\u4e86\u7dca\u6025\u7684\u5b89\u5168\u66f4\u65b0\uff0c\u56e0\u70ba\u5b83\u767c\u73fe\u4e86\u4e2d\u570b\u99ed\u5ba2\u7d44\u7e54<a href=\"https:\/\/www.securityweek.com\/microsoft-says-solarwinds-serv-u-zero-day-exploited-chinese-group\">DEV-0322<\/a>\u5728\u91dd\u5c0d\u6027\u653b\u64ca\u4e2d\u5229\u7528\u5b83\u3002\u8ddd\u96e2 SolarWinds \u767c\u5e03\u6b64\u6f0f\u6d1e\u7684\u5b89\u5168\u66f4\u65b0\u5df2\u7d93\u8fd1\u56db\u500b\u6708\uff0c\u4f46\u6f5b\u5728\u7684\u6613\u53d7\u653b\u64ca\u7684 Serv-U\u4f3a\u670d\u5668\u7684\u767e\u5206\u6bd4\u4ecd\u4fdd\u6301\u5728 60% \u4ee5\u4e0a\uff0c\u5efa\u8b70\u7acb\u5373\u4f7f\u7528Serv-U 15.2.3\u7248\u672c<a>\u7684<\/a>hotfix\u6216\u66f4\u9ad8\u7684\u7248\u672c\u3002<\/p>\n\n\n\n<p>\u4ee5\u5f80Clop\u4e5f\u5728\u5176\u653b\u64ca\u4e2d\u4f7f\u7528\u6f0f\u6d1e\uff0c\u4f8b\u5982\u5728<a href=\"https:\/\/blog.billows.com.tw\/?p=901\">Accellion<\/a> FTA\u4f3a\u670d\u5668\u4e2d\u7684\u96f6\u6642\u5dee\u6f0f\u6d1e\u653b\u64ca\u3002NCC\u7814\u7a76\u4eba\u54e1\u8868\u793a\uff0c\u5728\u767c\u73fe\u7684\u65b0\u653b\u64ca\u4e2d\uff0c\u5728\u6210\u529f\u5229\u7528 CVE-2021-35211 \u4e4b\u5f8c\uff0c\u64cd\u4f5cClop\u52d2\u7d22\u8edf\u9ad4\u7684\u99ed\u5ba2\u5229\u7528 Serv-U\u4f3a\u670d\u5668\u7522\u751f\u4e00\u500b\u7531\u653b\u64ca\u8005\u63a7\u5236\u7684\u5b50\u9032\u7a0b(Subprocess)\uff0c\u5f9e\u800c\u4f7f\u4ed6\u5011\u80fd\u5920\u5728\u76ee\u6a19\u7cfb\u7d71\u4e0a\u904b\u884ccommand\uff0c\u958b\u95e2\u4e86\u60e1\u610f\u8edf\u9ad4\u7684\u90e8\u7f72\u3001\u7db2\u8def\u5075\u5bdf\u548c\u6a6b\u5411\u79fb\u52d5\uff0c\u70ba\u52d2\u7d22\u8edf\u9ad4\u653b\u64ca\u5960\u5b9a\u4e86\u57fa\u790e\u3002\u7814\u7a76\u4eba\u54e1\u89e3\u91cb\u8aaa\uff0c\u4f5c\u70ba\u653b\u64ca\u7684\u4e00\u90e8\u5206\uff0cClop\u4f7f\u7528PowerShell\u547d\u4ee4\u4f86\u90e8\u7f72 Cobalt Strike Beacon\u3002\u6b64\u5916\uff0c\u653b\u64ca\u8005\u52ab\u6301\u4e86\u540d\u70ba RegIdleBackup \u7684\u9810\u5b9a\u4efb\u52d9\uff0c\u4f7f\u4ed6\u5011\u80fd\u5920\u5728\u5165\u4fb5\u7684\u6a5f\u5668\u4e0a\u5be6\u73fe\u6301\u4e45\u6027\u4e26\u5728\u4e0b\u4e00\u968e\u6bb5\uff0c\u90e8\u7f72FlawedGrace RAT (TA505\u81f3\u5c11\u81ea 2017 \u5e74 11 \u6708\u4ee5\u4f86\u4e00\u76f4\u5728\u4f7f\u7528\u7684\u5de5\u5177)\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"554\" height=\"462\" src=\"https:\/\/blog.billows.com.tw\/wp-content\/uploads\/2021\/11\/image-4.png\" alt=\"\" class=\"wp-image-1498\" srcset=\"https:\/\/blog.billows.com.tw\/wp-content\/uploads\/2021\/11\/image-4.png 554w, https:\/\/blog.billows.com.tw\/wp-content\/uploads\/2021\/11\/image-4-300x250.png 300w\" sizes=\"auto, (max-width: 554px) 100vw, 554px\" \/><figcaption>Photo Credit: NCC Group<\/figcaption><\/figure>\n\n\n\n<p>\u76ee\u524d\uff0c\u6700\u591a\u6613\u53d7\u653b\u64ca\u7684 Serv-U\u4f3a\u670d\u5668\u7684\u570b\u5bb6\u662f\u4e2d\u570b\uff0c\u67091141\u53f0\uff0c\u800c\u7f8e\u570b\u5247\u4f4d\u5c45\u7b2c\u4e8c\uff0c\u53f0\u7063\u4e5f\u670950\u53f0\u53d7\u653b\u64ca\u7684\u4f3a\u670d\u5668\u3002<\/p>\n\n\n\n<p>\u7814\u7a76\u4eba\u54e1\u5728\u5831\u544a\u4e2d\u8b66\u544a\u8aaa\uff0c7 \u6708\u4efd\u5728Port22\u4e0a\u8b58\u5225\u51fa\u7684 Serv-U (S)FTP\u4f3a\u670d\u5668\u4e2d\u6709 5945\u53f0 (94%)\u8655\u65bc\u6613\u53d7\u653b\u64ca\u7684\u72c0\u614b\u300210\u6708\u4efd\uff0c\u5728SolarWinds\u767c\u4f48\u4fee\u88dc\u4e09\u500b\u6708\u5f8c\uff0c\u6f5b\u5728\u6613\u53d7\u653b\u64ca\u7684\u4f3a\u670d\u5668\u6578\u91cf\u4ecd\u7136\u5f88\u5927\uff0c\u70ba2784\u53f0\uff0866.5%\uff09\u3002<\/p>\n\n\n\n<p>NCC Group \u70ba\u61f7\u7591\u53d7\u5230\u653b\u64ca\u7684\u7cfb\u7d71\u7ba1\u7406\u54e1\u767c\u5e03\u4e86\u4ee5\u4e0b\u7684\u6e05\u55ae:<\/p>\n\n\n\n<p>*\u6aa2\u67e5\u60a8\u7684 Serv-U \u7248\u672c\u662f\u5426\u6613\u53d7\u653b\u64ca<\/p>\n\n\n\n<p>*\u627e\u5230 Serv-U \u7684 DebugSocketlog.txt<\/p>\n\n\n\n<p>*\u641c\u7d22\u8af8\u5982\u2018EXCEPTION: C0000005; CSUSSHSocket::ProcessReceive();\u2019\u4e4b\u985e\u7684\u9805\u76ee<\/p>\n\n\n\n<p>*\u6aa2\u67e5 Windows \u4e8b\u4ef6\u65e5\u8a8c\u4e2d\u570d\u7e5e\u7570\u5e38\u65e5\u671f\/\u6642\u9593\u7684\u4e8b\u4ef6 ID 4104\uff0c\u4e26\u67e5\u627e\u53ef\u7591\u7684 PowerShell \u547d\u4ee4<\/p>\n\n\n\n<p>*\u4f7f\u7528\u63d0\u4f9b\u7684 PowerShell \u547d\u4ee4\u6aa2\u67e5\u662f\u5426\u5b58\u5728\u540d\u70ba RegIdleBackup\u88ab\u52ab\u6301\u7684\u9810\u5b9a\u4efb\u52d9<\/p>\n\n\n\n<p>*\u9810\u9632\u88ab\u6feb\u7528\uff1aCOM handler\u4e2d\u7684 CLSID \u4e0d\u61c9\u8a2d\u7f6e\u70ba {CA767AA8-9157-4604-B64B-40747123D5F2}<\/p>\n\n\n\n<p>*\u5982\u679c\u4efb\u52d9\u5305\u542b\u4e0d\u540c\u7684 CLSID\uff1a\u4f7f\u7528\u63d0\u4f9b\u7684 PowerShell \u547d\u4ee4\u6aa2\u67e5\u8a3b\u518a\u8868\u4e2d CLSID \u5c0d\u8c61\u7684\u5167\u5bb9\uff0c\u8fd4\u56de Base64 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MORE<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-1497","post","type-post","status-publish","format-standard","hentry","category-6"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/blog.billows.com.tw\/index.php?rest_route=\/wp\/v2\/posts\/1497","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.billows.com.tw\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.billows.com.tw\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.billows.com.tw\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.billows.com.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1497"}],"version-history":[{"count":1,"href":"https:\/\/blog.billows.com.tw\/index.php?rest_route=\/wp\/v2\/posts\/1497\/revisions"}],"predecessor-version":[{"id":1499,"href":"https:\/\/blog.billows.com.tw\/index.php?rest_route=\/wp\/v2\/posts\/1497\/revisions\/1499"}],"wp:attachment":[{"href":"https:\/\/blog.billows.com.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1497"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.billows.com.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1497"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.billows.com.tw\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1497"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}