{"id":116027,"date":"2026-10-20T16:25:01","date_gmt":"2026-10-20T08:25:01","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/116027.html"},"modified":"2026-10-20T16:25:01","modified_gmt":"2026-10-20T08:25:01","slug":"%e6%9c%8d%e5%8a%a1%e5%99%a8%e8%a2%ab%e5%85%a5%e4%be%b5%e5%90%8e%e7%ac%ac%e4%b8%80%e4%bb%b6%e4%ba%8b%e5%81%9a%e4%bb%80%e4%b9%88%ef%bc%9flinux%e5%ba%94%e6%80%a5%e5%93%8d%e5%ba%94%e4%b8%8e%e6%94%bb","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/116027.html","title":{"rendered":"\u670d\u52a1\u5668\u88ab\u5165\u4fb5\u540e\u7b2c\u4e00\u4ef6\u4e8b\u505a\u4ec0\u4e48\uff1fLinux\u5e94\u6025\u54cd\u5e94\u4e0e\u653b\u51fb\u6eaf\u6e90\u5b8c\u6574\u6392\u67e5\u6d41\u7a0b\u200b"},"content":{"rendered":"

\/* MD \/ \u5bcc\u6587\u672c\u4e2d\u7684 .toc\uff08\u542b\u535a\u5ba2\u56ed\u642c\u5bb6\u7b49\u5d4c\u5957\u7ed3\u6784\uff09\uff1b.toc-box \u5728\u4fa7\u680f\uff0c\u4e0d\u53d7\u5f71\u54cd *\/
\n #content_views .toc,
\n \/* \u7f16\u8f91\u5668\u5e38\u5728\u76ee\u5f55\u524d\u540e\u63d2\u5165\u7a7a p\uff08:empty \u4ecd\u5360 20px\uff09\uff0c\u4e00\u5e76\u53bb\u6389\u907f\u514d\u9876\u7a7a\u9699 *\/
\n #content_views.markdown_views > p:empty:has(+ .toc),
\n #content_views.markdown_views > .toc + p:empty,
\n \/* \u5bcc\u6587\u672c\u65e7\u7248\u76ee\u5f55\u6807\u8bb0 *\/
\n #content_views.htmledit_views #main-toc,
\n #content_views.htmledit_views #hr-toc,
\n #content_views.htmledit_views p[id*=\\”-toc\\”] {
\n display: none !important;
\n }
\n \/* \u76ee\u5f55\u53bb\u6389\u540e\uff0c\u7d27\u8ddf\u7684\u9996\u4e2a\u6807\u9898\u4e0d\u518d\u591a\u51fa\u4e00\u5757\u4e0a\u8fb9\u8ddd *\/
\n #content_views.markdown_views > .toc + h1,
\n #content_views.markdown_views > .toc + h2,
\n #content_views.markdown_views > .toc + h3,
\n #content_views.markdown_views > .toc + h4,
\n #content_views.markdown_views > .toc + p:empty + h1,
\n #content_views.markdown_views > .toc + p:empty + h2,
\n #content_views.markdown_views > .toc + p:empty + h3,
\n #content_views.markdown_views > .toc + p:empty + h4 {
\n margin-top: 0 !important;
\n }<\/p>\n

\u5f15\u8a00<\/h3>\n

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\u5e94\u6025\u54cd\u5e94\u6838\u5fc3\u539f\u5219<\/h3>\n

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  • \n

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  • \n

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  • \n

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  • \n

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  • \n

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    # \u5207\u65ad\u6240\u6709\u7f51\u7edcI\/O（\u7acb\u5373\u6267\u884c，\u614e\u91cd！）<\/span>
    \niptables -P<\/span> INPUT DROP
    \niptables -P<\/span> OUTPUT DROP
    \niptables -P<\/span> FORWARD DROP<\/p>\n

    # \u8bb0\u5f55\u5f53\u524d\u72b6\u6001\u5e76\u751f\u6210\u5feb\u7167（\u63a8\u8350\u4f7f\u7528Btrfs\u6216LVM\u5feb\u7167）<\/span>
    \nbtrfs subvolume snapshot -r<\/span> \/ \/var\/backup\/2024-10-01-snapshot<\/p>\n

    \u89e3\u91ca：\u4ee5\u4e0a\u547d\u4ee4\u5c06\u6240\u6709\u7f51\u7edc\u6d41\u91cf\u963b\u65ad，\u907f\u514d\u653b\u51fb\u8005\u7ee7\u7eed\u7a83\u53d6\u6570\u636e\u6216\u6267\u884c\u547d\u4ee4\u3002Btrfs\u5feb\u7167\u529f\u80fd\u53ef\u4ee5\u5728\u4e0d\u5f71\u54cd\u539f\u7cfb\u7edf\u7684\u60c5\u51b5\u4e0b\u521b\u5efa\u53ea\u8bfb\u526f\u672c，\u4fbf\u4e8e\u540e\u7eed\u5206\u6790\u3002Btrfs\u5feb\u7167\u57fa\u4e8eCOW（\u5199\u65f6\u590d\u5236）\u673a\u5236，\u521b\u5efa\u5feb\u7167\u65f6\u4ec5\u8bb0\u5f55\u66f4\u6539\u70b9，\u7236\u6587\u4ef6\u7cfb\u7edf\u4fdd\u6301\u4e0d\u53d8\u3002\u8fd9\u5728\u4f01\u4e1a\u73af\u5883\u4e2d\u5c24\u4e3a\u5173\u952e，\u56e0\u4e3a\u5b83\u5141\u8bb8\u5b89\u5168\u56e2\u961f\u5728\u79bb\u7ebf\u73af\u5883\u4e2d\u5b89\u5168\u5206\u6790，\u800c\u4e0d\u5f71\u54cd\u751f\u4ea7\u4e1a\u52a1\u3002\u5feb\u7167\u540e，\u5efa\u8bae\u4f7f\u7528btrfs subvolume list\u9a8c\u8bc1\u5feb\u7167\u662f\u5426\u6210\u529f\u521b\u5efa\u3002<\/p>\n

    \u4e5f\u53ef\u4ee5\u4f7f\u7528dd\u547d\u4ee4\u5bf9\u78c1\u76d8\u5206\u533a\u955c\u50cf：<\/p>\n

    # \u521b\u5efa\u5b8c\u6574\u78c1\u76d8\u955c\u50cf（\u5efa\u8bae\u4f7f\u7528\u786c\u4ef6\u5199\u4fdd\u62a4\u5668\u6216\u865a\u62df\u673a）<\/span>
    \ndd<\/span> if<\/span>=<\/span>\/dev\/sda of<\/span>=<\/span>\/var\/backup\/server-disk.img bs<\/span>=<\/span>4M status<\/span>=<\/span>progress conv<\/span>=<\/span>noerror,sync<\/p>\n

    \u6b64\u955c\u50cf\u4fdd\u7559\u4e86\u6240\u6709\u6587\u4ef6\u7cfb\u7edf\u3001\u65e5\u5fd7\u548c\u5143\u6570\u636e，\u53ef\u7528\u4e8e\u79bb\u7ebf\u5206\u6790\u6216\u6cd5\u5f8b\u53d6\u8bc1\u3002\u6ce8\u610f：\u955c\u50cf\u8fc7\u7a0b\u53ef\u80fd\u5bfc\u81f4\u77ed\u6682\u4e1a\u52a1\u4e2d\u65ad，\u9700\u5728\u751f\u4ea7\u73af\u5883\u524d\u6d4b\u8bd5\u3002dd\u547d\u4ee4\u5e95\u5c42\u4f7f\u7528DMA（\u76f4\u63a5\u5185\u5b58\u8bbf\u95ee）\u6280\u672f\u7ed5\u8fc7CPU，\u663e\u8457\u964d\u4f4e\u7cfb\u7edf\u6027\u80fd\u5f71\u54cd\u3002\u5efa\u8bae\u4f7f\u7528bs=4M\u5e73\u8861\u901f\u5ea6\u4e0e\u5185\u5b58\u5360\u7528\u3002\u5907\u4efd\u5b8c\u6210\u540e，\u5e94\u8ba1\u7b97SHA-256\u6821\u9a8c\u548c：<\/p>\n

    sha256sum \/var\/backup\/server-disk.img ><\/span> \/var\/backup\/checksum.txt<\/p>\n

    \u8fd9\u63d0\u4f9b\u5b8c\u6574\u6027\u9a8c\u8bc1，\u9632\u6b62\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u7684\u7be1\u6539\u3002<\/p>\n

    \u6b64\u5916，\u53ef\u5e76\u884c\u6267\u884cLVM\u5feb\u7167（\u9002\u5408ext4\u6587\u4ef6\u7cfb\u7edf）：<\/p>\n

    lvcreate -s<\/span> -n<\/span> snapshot_root -L<\/span> 10G \/dev\/vg0\/root
    \nlvcreate -s<\/span> -n<\/span> snapshot_var -L<\/span> 5G \/dev\/vg0\/var<\/p>\n

    \u8fd9\u4e9b\u5feb\u7167\u5728\u5206\u6790\u9636\u6bb5\u63d0\u4f9b\u53ea\u8bfb\u6302\u8f7d\u70b9，\u65b9\u4fbf\u5de5\u5177\u5982Autopsy\u8fdb\u884c\u78c1\u76d8\u5c42\u7ea7\u53d6\u8bc1\u3002<\/p>\n

    \u7b2c\u4e8c\u6b65：\u65e5\u5fd7\u5206\u6790\u4e0e\u53ef\u7591\u6d3b\u52a8\u8bc6\u522b<\/h3>\n

    \u65e5\u5fd7\u662f\u5165\u4fb5\u6eaf\u6e90\u6700\u76f4\u63a5\u7684\u8bc1\u636e\u6765\u6e90\u3002Linux\u7cfb\u7edf\u6838\u5fc3\u65e5\u5fd7\u5305\u62ec\/var\/log\/auth.log（\u8ba4\u8bc1\u65e5\u5fd7）\u3001\/var\/log\/secure（SSH\u76f8\u5173）\u3001\/var\/log\/syslog\u548c\/var\/log\/kern.log（\u5185\u6838\u4e8b\u4ef6）\u3002\u65e5\u5fd7\u5206\u6790\u662f\u57fa\u4e8e\u4e8b\u4ef6\u9a71\u52a8\u5b89\u5168\u76d1\u63a7\u7684\u5178\u578b\u5e94\u7528，\u7ed3\u5408\u65f6\u95f4\u5e8f\u5217\u5206\u6790\u53ef\u6784\u5efa\u653b\u51fb\u8005\u884c\u4e3a\u6a21\u578b\u3002\u5e38\u89c1\u653b\u51fb\u5982\u66b4\u529b\u7834\u89e3\u3001\u6743\u9650\u5229\u7528\u4f1a\u7559\u4e0b\u7ed3\u6784\u5316\u75d5\u8ff9\u3002<\/p>\n

    # \u5206\u6790SSH\u8ba4\u8bc1\u65e5\u5fd7（\u67e5\u627e\u6700\u8fd1\u5f02\u5e38\u767b\u5f55）<\/span>
    \ngrep<\/span> -i<\/span> "sshd"<\/span> \/var\/log\/auth.log |<\/span> tail<\/span> -100<\/span><\/p>\n

    # \u67e5\u627e\u53ef\u7591IP\u548c\u7aef\u53e3\u8fde\u63a5<\/span>
    \ngrep<\/span> -E<\/span> "Failed|Invalid|Brute force"<\/span> \/var\/log\/auth.log<\/p>\n

    # Python\u793a\u4f8b：\u89e3\u6790auth.log\u63d0\u53d6\u53ef\u7591\u767b\u5f55\u6a21\u5f0f<\/span>
    \nimport<\/span> re
    \nimport<\/span> datetime<\/p>\n

    with<\/span> open<\/span>(<\/span>'\/var\/log\/auth.log'<\/span>,<\/span> 'r'<\/span>)<\/span> as<\/span> f:<\/span>
    \n for<\/span> line in<\/span> f:<\/span>
    \n if<\/span> re.<\/span>search(<\/span>r'Failed password|Invalid user|sshd'<\/span>,<\/span> line,<\/span> re.<\/span>IGNORECASE)<\/span>:<\/span>
    \n match<\/span> =<\/span> re.<\/span>search(<\/span>r'\\\\[(.*?)\\\\]'<\/span>,<\/span> line)<\/span>
    \n if<\/span> match<\/span>:<\/span>
    \n timestamp =<\/span> match<\/span>.<\/span>group(<\/span>1<\/span>)<\/span>
    \n print<\/span>(<\/span>f"[<\/span>{<\/span>timestamp}<\/span><\/span>] \u68c0\u6d4b\u5230\u53ef\u7591\u8ba4\u8bc1: <\/span>{<\/span>line.<\/span>strip(<\/span>)<\/span>}<\/span><\/span>"<\/span><\/span>)<\/span><\/p>\n

    \u8be5\u811a\u672c\u4f1a\u8f93\u51fa\u5305\u542b\u201cFailed password\u201d\u7684\u884c，\u65b9\u4fbf\u5feb\u901f\u5b9a\u4f4d\u5c1d\u8bd5\u6b21\u6570\u3002\u8fdb\u4e00\u6b65\u53ef\u7ed3\u5408grep -v root\u8fc7\u6ee4\u51fa\u975eroot\u7528\u6237\u7684\u5f02\u5e38\u884c\u4e3a，\u6216awk\u7edf\u8ba1IP\u9891\u7387：<\/p>\n

    awk<\/span> '{print $11}'<\/span> \/var\/log\/auth.log |<\/span> sort<\/span> |<\/span> uniq<\/span> -c<\/span> |<\/span> sort<\/span> -nr<\/span><\/p>\n

    \u6b64\u547d\u4ee4\u7edf\u8ba1\u6bcf\u4e2aIP\u7684\u767b\u5f55\u5c1d\u8bd5\u6b21\u6570，\u5e38\u89c1\u653b\u51fb\u7279\u5f81\u5982\u8fde\u7eed\u5931\u8d25\u53ef\u88ab\u6807\u8bb0\u3002\u793a\u4f8b\u8f93\u51fa\u663e\u793a\u5982：<\/p>\n

    500 198.51.100.23
    \n300 203.0.113.5<\/p>\n

    \u8868\u793a\u524d\u4e24\u4e2aIP\u662f\u4e3b\u8981\u653b\u51fb\u8005\u3002\u5efa\u8bae\u4f7f\u7528logrotate\u5206\u6790\u5386\u53f2\u65e5\u5fd7，\u5e76\u7ed3\u5408journalctl\u6355\u83b7\u7cfb\u7edf\u7ea7\u65e5\u5fd7：<\/p>\n

    journalctl -u<\/span> sshd.service –since<\/span> "1 hour ago"<\/span> -f<\/span><\/p>\n

    \u8fd9\u63d0\u4f9b\u5b9e\u65f6\u6d41\u5f0f\u65e5\u5fd7，\u4fbf\u4e8e\u5b9e\u65f6\u68c0\u6d4b\u3002<\/p>\n

    \u6b64\u5916，\u53ef\u4f7f\u7528ELK\u6808（Elasticsearch, Logstash, Kibana）\u8fdb\u884c\u96c6\u4e2d\u5f0f\u65e5\u5fd7\u5206\u6790，\u6784\u5efa\u81ea\u5b9a\u4e49\u89c4\u5219\u68c0\u6d4b\u6a21\u5f0f\u5982failed_attempts > 10\u3002<\/p>\n

    \u7b2c\u4e09\u6b65：\u6587\u4ef6\u5b8c\u6574\u6027\u68c0\u67e5\u4e0e\u540e\u95e8\u68c0\u6d4b<\/h3>\n

    \u653b\u51fb\u8005\u5e38\u5728\/etc\/cron.*\u3001\/usr\/bin\u6216\u9690\u85cf\u76ee\u5f55\u653e\u7f6e\u540e\u95e8\u3002\u4f7f\u7528chkrootkit\u6216\u81ea\u5b9a\u4e49MD5\u6821\u9a8c\u3002\u6587\u4ef6\u5b8c\u6574\u6027\u68c0\u67e5\u662f\u57fa\u4e8e\u54c8\u5e0c\u548c\u65f6\u95f4\u6233\u7684\u4fe1\u4efb\u6a21\u578b，\u5b9a\u671f\u57fa\u7ebf\u751f\u6210\u53ef\u68c0\u6d4b\u5f02\u5e38\u884c\u4e3a\u3002<\/p>\n

    # \u4f7f\u7528chkrootkit\u626b\u63cf\u7cfb\u7edf<\/span>
    \nchkrootkit ><\/span> \/var\/backup\/chkrootkit.log<\/p>\n

    # \u81ea\u5b9a\u4e49MD5\u6821\u9a8c（\u751f\u6210\u57fa\u7ebf\u54c8\u5e0c\u5e76\u5bf9\u6bd4）<\/span>
    \nfind<\/span> \/ -type<\/span> f -mtime<\/span> -7<\/span> -exec<\/span> md5sum {<\/span>}<\/span> \\\\<\/span>;<\/span> ><\/span> \/var\/backup\/current_hashes.txt<\/p>\n

    Python\u811a\u672c\u793a\u4f8b\u7528\u4e8e\u6bd4\u5bf9\u54c8\u5e0c\u503c：<\/p>\n

    # \u68c0\u6d4b\u6587\u4ef6\u4fee\u6539（\u751f\u6210\u57fa\u7ebf\u54c8\u5e0c\u540e\u518d\u6b21\u6267\u884c\u5bf9\u6bd4）<\/span>
    \nimport<\/span> hashlib
    \nimport<\/span> os<\/p>\n

    def<\/span> compute_hash<\/span>(<\/span>file_path)<\/span>:<\/span>
    \n h =<\/span> hashlib.<\/span>md5(<\/span>)<\/span>
    \n with<\/span> open<\/span>(<\/span>file_path,<\/span> 'rb'<\/span>)<\/span> as<\/span> f:<\/span>
    \n h.<\/span>update(<\/span>f.<\/span>read(<\/span>)<\/span>)<\/span>
    \n return<\/span> h.<\/span>hexdigest(<\/span>)<\/span><\/p>\n

    baseline =<\/span> {<\/span>}<\/span> # \u4ece\u4e4b\u524d\u8bb0\u5f55\u7684baseline\u54c8\u5e0c\u52a0\u8f7d<\/span>
    \nfor<\/span> root,<\/span> dirs,<\/span> files in<\/span> os.<\/span>walk(<\/span>'\/'<\/span>)<\/span>:<\/span>
    \n for<\/span> file<\/span> in<\/span> files:<\/span>
    \n if<\/span> file<\/span> in<\/span> [<\/span>'.swp'<\/span>,<\/span> 'swapfile'<\/span>]<\/span>:<\/span> continue<\/span> # \u5ffd\u7565\u4e34\u65f6\u6587\u4ef6<\/span>
    \n path =<\/span> os.<\/span>path.<\/span>join(<\/span>root,<\/span> file<\/span>)<\/span>
    \n try<\/span>:<\/span>
    \n current =<\/span> compute_hash(<\/span>path)<\/span>
    \n if<\/span> path in<\/span> baseline and<\/span> baseline[<\/span>path]<\/span> !=<\/span> current:<\/span>
    \n print<\/span>(<\/span>f"\u4fee\u6539\u68c0\u6d4b: <\/span>{<\/span>path}<\/span><\/span>"<\/span><\/span>)<\/span>
    \n except<\/span>:<\/span>
    \n continue<\/span><\/p>\n

    \u6b64\u811a\u672c\u6bd4\u8f83\u6587\u4ef6\u4fee\u6539\u65f6\u95f4\u548c\u5185\u5bb9，\u53ef\u5feb\u901f\u5b9a\u4f4d\u690d\u5165\u540e\u95e8\u7684\u6587\u4ef6\u3002\u5efa\u8bae\u5b9a\u671f\u8fd0\u884caide –check\u751f\u6210AIDE\u6570\u636e\u5e93\u8fdb\u884c\u589e\u91cf\u6821\u9a8c\u3002AIDE\u4f7f\u7528\u54c8\u5e0c\u8868\u5b58\u50a8\u6587\u4ef6\u5c5e\u6027，\u652f\u6301\u6269\u5c55\u5982SUID\u4f4d\u68c0\u6d4b\u3002chkrootkit\u5219\u901a\u8fc7\u7b7e\u540d\u68c0\u6d4b\u5e38\u89c1\u540e\u95e8\u5982rootkit.c\u3002<\/p>\n

    \u5e38\u89c1\u8e29\u5751\u662f\u5ffd\u7565\u9690\u85cf\u6587\u4ef6，\u5efa\u8bae\u4f7f\u7528find \/ -name ".*" -type f -mtime -30\u5b9a\u4f4d\u3002<\/p>\n

    \u7b2c\u56db\u6b65：\u7f51\u7edc\u8fde\u63a5\u4e0e\u670d\u52a1\u5ba1\u8ba1<\/h3>\n

    \u653b\u51fb\u5e38\u901a\u8fc7\u76d1\u542c\u7aef\u53e3\u3001C2\u901a\u4fe1\u6216\u53cd\u5f39Shell\u5b9e\u73b0\u6301\u4e45\u5316\u3002\u7f51\u7edc\u5ba1\u8ba1\u7ed3\u5408\u534f\u8bae\u5206\u6790\u53ef\u8bc6\u522bC2\u901a\u4fe1\u7279\u5f81\u3002<\/p>\n

    # \u67e5\u770b\u6240\u6709\u76d1\u542c\u7aef\u53e3\u4e0e\u8fdb\u7a0b<\/span>
    \nnetstat<\/span> -tuln<\/span>
    \nss -tuln<\/span><\/p>\n

    # \u8fdb\u7a0b\u6811\u67e5\u770b（\u67e5\u627e\u53ef\u7591\u7528\u6237\u8fdb\u7a0b）<\/span>
    \nps<\/span> aux –sort<\/span>=<\/span>-%cpu |<\/span> head<\/span> -50<\/span><\/p>\n

    # Python\u793a\u4f8b：\u68c0\u6d4b\u5f02\u5e38\u7aef\u53e3\u548c\u8fdb\u7a0b<\/span>
    \nimport<\/span> socket
    \nimport<\/span> subprocess<\/p>\n

    # \u626b\u63cf\u5e38\u89c1\u7aef\u53e3<\/span>
    \nports =<\/span> [<\/span>22<\/span>,<\/span> 80<\/span>,<\/span> 443<\/span>,<\/span> 8080<\/span>,<\/span> 3306<\/span>,<\/span> 5432<\/span>]<\/span>
    \nfor<\/span> port in<\/span> ports:<\/span>
    \n with<\/span> socket.<\/span>socket(<\/span>socket.<\/span>AF_INET,<\/span> socket.<\/span>SOCK_STREAM)<\/span> as<\/span> s:<\/span>
    \n s.<\/span>settimeout(<\/span>1<\/span>)<\/span>
    \n if<\/span> s.<\/span>connect_ex(<\/span>(<\/span>'localhost'<\/span>,<\/span> port)<\/span>)<\/span> ==<\/span> 0<\/span>:<\/span>
    \n print<\/span>(<\/span>f"Port <\/span>{<\/span>port}<\/span><\/span> is listening"<\/span><\/span>)<\/span><\/p>\n

    # \u67e5\u627e\u975e\u6807\u51c6\u670d\u52a1<\/span>
    \nresult =<\/span> subprocess.<\/span>run(<\/span>[<\/span>'ps'<\/span>,<\/span> '-aux'<\/span>]<\/span>,<\/span> capture_output=<\/span>True<\/span>,<\/span> text=<\/span>True<\/span>)<\/span>
    \nfor<\/span> line in<\/span> result.<\/span>stdout.<\/span>splitlines(<\/span>)<\/span>:<\/span>
    \n if<\/span> 'nc'<\/span> in<\/span> line.<\/span>lower(<\/span>)<\/span> or<\/span> 'python'<\/span> in<\/span> line.<\/span>lower(<\/span>)<\/span> and<\/span> '80'<\/span> in<\/span> line:<\/span> # \u5e38\u89c1\u540e\u95e8\u7279\u5f81<\/span>
    \n print<\/span>(<\/span>"\u53ef\u7591\u8fdb\u7a0b:"<\/span>,<\/span> line)<\/span><\/p>\n

    \u6b64\u811a\u672c\u53ef\u5feb\u901f\u5b9a\u4f4d\u5f02\u5e38\u76d1\u542c\u7aef\u53e3\u548c\u53ef\u7591\u670d\u52a1\u8fdb\u7a0b\u3002netstat -tuln\u663e\u793aTCP\/UDP\u76d1\u542c，\u63a8\u8350\u7ed3\u5408lsof\u83b7\u53d6\u8fdb\u7a0b\u8be6\u60c5：<\/p>\n

    lsof<\/span> -i<\/span> :8080<\/p>\n

    \u8fd9\u663e\u793a\u5360\u7528\u4e86\u7aef\u53e3\u7684\u8fdb\u7a0b\u540d\u79f0\u548c\u7528\u6237\u3002<\/p>\n

    \u7b2c\u4e94\u6b65：\u653b\u51fb\u6eaf\u6e90\u4e0e\u6765\u6e90\u8ffd\u8e2a<\/h3>\n

    \u8ffd\u8e2a\u653b\u51fb\u6e90\u9700\u7ed3\u5408\u7f51\u7edc\u6d41\u91cf\u3001DNS\u89e3\u6790\u548c\u65f6\u95f4\u7ebf\u5206\u6790\u3002\u65f6\u95f4\u7ebf\u6784\u5efa\u53ef\u7528\u4e8e\u91cd\u73b0\u653b\u51fb\u5e8f\u5217\u3002<\/p>\n

    # \u6355\u83b7\u7f51\u7edc\u6d41\u91cf（\u4f7f\u7528tcpdump，\u9700sudo）<\/span>
    \ntcpdump -i<\/span> any -w<\/span> \/var\/backup\/capture.pcap -s<\/span> 0<\/span><\/p>\n

    # \u65f6\u95f4\u7ebf\u6784\u5efa（\u7ed3\u5408ausearch）<\/span>
    \nausearch -ts<\/span> recent<\/p>\n

    \u4f7f\u7528Python\u7ed3\u5408Scapy\u6216tshark\u5206\u6790PCAP：<\/p>\n

    # \u7b80\u6613C2\u901a\u4fe1\u68c0\u6d4b\u793a\u4f8b（\u9700\u5b89\u88c5scapy）<\/span>
    \nfrom<\/span> scapy.<\/span>all<\/span> import<\/span> *<\/span>
    \npackets =<\/span> rdpcap(<\/span>'\/var\/backup\/capture.pcap'<\/span>)<\/span>
    \nfor<\/span> pkt in<\/span> packets:<\/span>
    \n if<\/span> pkt.<\/span>haslayer(<\/span>TCP)<\/span> and<\/span> pkt[<\/span>TCP]<\/span>.<\/span>dport ==<\/span> 443<\/span>:<\/span> # \u5e38\u89c1HTTPS C2<\/span>
    \n print<\/span>(<\/span>"\u68c0\u6d4b\u5230HTTPS\u901a\u4fe1:"<\/span>,<\/span> pkt.<\/span>summary(<\/span>)<\/span>)<\/span><\/p>\n

    \u7ed3\u5408who\u3001last\u3001lastb\u67e5\u770b\u767b\u5f55\u5386\u53f2，\u5e76\u5206\u6790\/var\/log\/utmp\u3001wtmp\u6587\u4ef6\u7684\u65f6\u95f4\u7ebf，\u53ef\u8fd8\u539f\u653b\u51fb\u8005\u5165\u4fb5\u8def\u5f84\u3002Scapy\u63d0\u4f9b\u534f\u8bae\u89e3\u6790\u80fd\u529b，rdpcap\u53ef\u52a0\u8f7d\u6355\u83b7\u6587\u4ef6\u8fdb\u884c\u6df1\u5ea6\u8fc7\u6ee4\u3002<\/p>\n

    \u5b9e\u6218\u6848\u4f8b<\/h3>\n

    \u67d0\u4f01\u4e1aWeb\u670d\u52a1\u5668\u56e0SSH\u5f31\u53e3\u4ee4\u8fde\u7eed\u88ab\u7206\u7834\u3002\u5e94\u6025\u54cd\u5e94\u6d41\u7a0b\u5982\u4e0b：<\/p>\n

  • \n

    \u9694\u79bb：\u6267\u884c\u4e0a\u8ff0iptables\u547d\u4ee4，\u5207\u65ad\u7f51\u7edc\u3002\u622a\u56fe\u5e76\u8bb0\u5f55\u65f6\u95f4（2024-10-01 14:23:00）\u3002<\/p>\n<\/li>\n

  • \n

    \u65e5\u5fd7\u5206\u6790：grep "Failed password" \/var\/log\/auth.log \u663e\u793a\u8d85\u8fc7500\u6b21\u5931\u8d25，IP\u6bb5\u4e3a198.51.100.0\/24\u3002<\/p>\n<\/li>\n

  • \n

    \u6587\u4ef6\u68c0\u67e5：\u8fd0\u884cchkrootkit，\u53d1\u73b0\/tmp\/.ssh_key\u6587\u4ef6（\u540e\u95e8）\u3002\u4f7f\u7528Python\u54c8\u5e0c\u811a\u672c\u786e\u8ba4\u6587\u4ef6\u5185\u5bb9\u4e0e\u9884\u671f\u4e0d\u540c\u3002<\/p>\n<\/li>\n

  • \n

    \u7f51\u7edc\u5ba1\u8ba1：tcpdump\u6355\u83b7\u663e\u793a\u653b\u51fb\u8005\u901a\u8fc780\u7aef\u53e3\u5411\u5916\u53d1\u9001\u6570\u636e\u5305，\u7aef\u53e3\u4e3a443（HTTPS）\u3002<\/p>\n<\/li>\n

  • \n

    \u6eaf\u6e90：\u5206\u6790PCAP\u663e\u793a\u653b\u51fb\u8005IP\u4e3a\u4e2d\u56fd\u5883\u5185\u67d0\u6570\u636e\u4e2d\u5fc3，\u7ed3\u5408DNS\u53cd\u67e5\u627e\u5230\u653b\u51fb\u8005\u670d\u52a1\u5668IP 203.0.113.5\u3002\u540e\u7eed\u8b66\u65b9\u534f\u52a9\u9501\u5b9a\u7269\u7406\u4f4d\u7f6e\u3002<\/p>\n<\/li>\n

    \u8be5\u6848\u4f8b\u6700\u7ec8\u4ec5\u9700\u5220\u9664\u540e\u95e8\u3001\u66f4\u65b0SSH\u5bc6\u94a5\u548c\u91cd\u542f\u670d\u52a1，\u635f\u5931\u63a7\u5236\u5728\u6781\u5c0f\u8303\u56f4\u5185\u3002\u76f8\u6bd4\u4e4b\u4e0b，\u82e5\u7b2c\u4e00\u6b65\u672a\u9694\u79bb，\u653b\u51fb\u8005\u53ef\u80fd\u5df2\u7a83\u53d6\u5168\u90e8\u6570\u636e\u5e93\u6570\u636e\u3002<\/p>\n

    \u8e29\u5751\u4e0e\u4f18\u5316\u5efa\u8bae<\/h3>\n

    \u5e38\u89c1\u8e29\u5751\u5305\u62ec：<\/p>\n

      \n
    • \u8bc1\u636e\u7be1\u6539：\u76f4\u63a5\u7f16\u8f91\u65e5\u5fd7\u6216\u5220\u9664\u6587\u4ef6，\u5bfc\u81f4\u53d6\u8bc1\u5931\u8d25\u3002\u89e3\u51b3\u65b9\u6848：\u4f7f\u7528\u53ea\u8bfb\u6302\u8f7d\u548c\u5feb\u7167，\u786e\u4fdd\u6240\u6709\u64cd\u4f5c\u4e0d\u53ef\u9006\u8f6c\u3002<\/li>\n
    • \u5047\u9633\u6027\u8bef\u62a5：chkrootkit\u62a5\u544a\u8fc7\u591a\u65e0\u5bb3\u6587\u4ef6\u3002\u4f18\u5316：\u7ed3\u5408AIDE\u548cHIDS\u5de5\u5177（\u5982OSSEC）\u8fdb\u884c\u8054\u5408\u9a8c\u8bc1，\u964d\u4f4e\u8bef\u62a5\u7387\u81f3<1%\u3002<\/li>\n
    • \u65e5\u5fd7\u4e22\u5931：\u653b\u51fb\u8005\u6e05\u7406\/var\/log\u3002\u89e3\u51b3\u65b9\u6848：\u4f7f\u7528\u8fdc\u7a0b\u65e5\u5fd7\u805a\u5408（\u5982Syslog-ng\u5230SIEM），\u5907\u4efd\u81f3\u4e91\u7aef\u6216\u5916\u90e8\u5b58\u50a8\u3002<\/li>\n
    • \u6027\u80fd\u5f71\u54cd：dd\u955c\u50cf\u5360\u7528\u5927\u91cfI\/O\u3002\u4f18\u5316：\u4f7f\u7528pv\u547d\u4ee4\u76d1\u63a7\u8fdb\u5ea6，\u6216\u5728\u865a\u62df\u673a\u4e2d\u8fdb\u884c\u955c\u50cf\u64cd\u4f5c\u3002<\/li>\n
    • \u591a\u7528\u6237\u73af\u5883\u590d\u6742\u6027：\u6743\u9650\u4e0d\u8db3\u5bfc\u81f4\u65e0\u6cd5\u626b\u63cf\u3002\u89e3\u51b3\u65b9\u6848：\u5207\u6362\u81f3\u7cfb\u7edf\u7528\u6237\u6267\u884c\u547d\u4ee4，\u5e76\u8bb0\u5f55sudo\u65e5\u5fd7\u3002<\/li>\n<\/ul>\n

      \u4f18\u5316\u5efa\u8bae：<\/p>\n

        \n
      • \u6784\u5efa\u54cd\u5e94\u56e2\u961f：\u8058\u8bf7\u4e13\u4e1a\u5b89\u5168\u516c\u53f8\u5982Mandiant\u8fdb\u884c\u5916\u90e8\u652f\u6301\u3002<\/li>\n
      • \u91c7\u7528\u81ea\u52a8\u5316\u5de5\u5177：\u5982Ansible Playbook\u8fdb\u884c\u6807\u51c6\u5316\u54cd\u5e94\u6d41\u7a0b\u3002<\/li>\n
      • \u6301\u7eed\u57f9\u8bad：\u5b9a\u671f\u8fdb\u884c\u7ea2\u84dd\u5bf9\u6297\u6f14\u7ec3\u3002<\/li>\n
      • \u6cd5\u5f8b\u51c6\u5907：\u786e\u4fdd\u65e5\u5fd7\u7b26\u5408\u6cd5\u5ead\u8981\u6c42，\u4f7f\u7528\u94fe\u8def\u52a0\u5bc6\u4fdd\u5b58\u8bc1\u636e\u3002<\/li>\n
      • \u6301\u7eed\u6539\u8fdb：\u5b9a\u671f\u66f4\u65b0\u5de5\u5177\u7b7e\u540d\u6570\u636e\u5e93\u3002<\/li>\n<\/ul>\n

        \u5e38\u89c1\u95ee\u9898（FAQ）<\/h3>\n

        Q1: \u5982\u4f55\u9009\u62e9\u5feb\u7167\u5de5\u5177？
        \nA: Btrfs\u9002\u5408\u4e13\u4e1a\u670d\u52a1\u5668，LVM\u9002\u5408\u901a\u7528\u73af\u5883\u3002\u4f18\u5148\u9009\u62e9\u652f\u6301\u539f\u5b50\u5feb\u7167\u7684\u65b9\u6848\u3002<\/p>\n

        Q2: Python\u811a\u672c\u80fd\u5426\u5b8c\u5168\u66ff\u4ee3Shell\u547d\u4ee4？
        \nA: \u9002\u5408\u7b80\u5355\u89e3\u6790，\u4f46\u590d\u6742\u7f51\u7edc\u5206\u6790\u4ecd\u9700Shell\u5de5\u5177\u6216Scapy\u3002<\/p>\n

        Q3: \u7f51\u7edc\u6355\u83b7\u7684\u9ed8\u8ba4\u5305\u5927\u5c0f\u5982\u4f55\u8bbe\u7f6e？
        \nA: -s 0\u6355\u83b7\u5b8c\u6574\u5305，\u5efa\u8bae-s 96\u4ee5\u51cf\u5c11\u5b58\u50a8\u3002<\/p>\n

        Q4: \u5982\u4f55\u5904\u7406\u591a\u53f0\u670d\u52a1\u5668\u7684\u6279\u91cf\u54cd\u5e94？
        \nA: \u4f7f\u7528Ansible\u6216SSH\u5e76\u884c\u6267\u884c\u547d\u4ee4，\u7ed3\u5408parallel\u5de5\u5177\u3002<\/p>\n

        Q5: \u653b\u51fb\u6eaf\u6e90\u540e\u5982\u4f55\u9632\u6b62\u518d\u6b21\u53d1\u751f？
        \nA: \u66f4\u65b0\u6240\u6709\u51ed\u8bc1\u3001\u5173\u95ed\u4e0d\u5fc5\u8981\u7aef\u53e3\u3001\u5b9e\u65bdWAF\u548c\u5165\u4fb5\u68c0\u6d4b\u7cfb\u7edf（IDS）\u3002<\/p>\n

        \u7ed3\u8bba<\/h3>\n

        \u672c\u6587\u8be6\u7ec6\u9610\u8ff0\u4e86Linux\u670d\u52a1\u5668\u88ab\u5165\u4fb5\u540e\u7684\u5e94\u6025\u54cd\u5e94\u6d41\u7a0b，\u4ece\u9694\u79bb\u5230\u6eaf\u6e90，\u6bcf\u4e00\u6b65\u90fd\u9700\u7ed3\u5408\u539f\u7406\u3001\u5de5\u5177\u548c\u6700\u4f73\u5b9e\u8df5\u3002\u5e0c\u671b\u901a\u8fc7\u672c\u6587，\u5b89\u5168\u56e2\u961f\u80fd\u5efa\u7acb\u89c4\u8303\u7684\u54cd\u5e94\u4f53\u7cfb，\u6700\u5927\u7a0b\u5ea6\u964d\u4f4e\u635f\u5931\u5e76\u4fdd\u62a4\u8bc1\u636e\u94fe\u3002\u5b9e\u9645\u64cd\u4f5c\u4e2d，\u5efa\u8bae\u7ed3\u5408FTK Imager\u7b49\u4e13\u4e1a\u53d6\u8bc1\u5de5\u5177\u8fdb\u884c\u6df1\u5ea6\u78c1\u76d8\u5206\u6790\u3002\u6301\u7eed\u76d1\u63a7\u548c\u81ea\u52a8\u5316\u662f\u672a\u6765\u8d8b\u52bf，\u4f46\u4eba\u673a\u534f\u540c\u4ecd\u662f\u6838\u5fc3\u3002<\/p>\n

        （\u5168\u6587\u7ea64280\u5b57，\u65b0\u589e\u7ea62121\u5b57，\u8986\u76d6\u539f\u7406\u3001\u6848\u4f8b\u3001\u6ce8\u91ca\u3001FAQ\u53ca\u66f4\u591a\u5185\u5bb9）<\/p>\n

        \"\u8bf7\u6dfb\u52a0\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

        \"\u8bf7\u6dfb\u52a0\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

        \"\u8bf7\u6dfb\u52a0\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

        \"\u8bf7\u6dfb\u52a0\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

        \"\u8bf7\u6dfb\u52a0\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

        \u66f4\u591a\u786c\u6838\u7f51\u5b89\u4e0eAI\u5de5\u5177\u5305，\u8bf7\u626b\u7801\u83b7\u53d6\u5b8c\u6574\u6e90\u7801！<\/p>\n","protected":false},"excerpt":{"rendered":"

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