{"id":195,"date":"2025-07-04T17:54:45","date_gmt":"2025-07-04T09:54:45","guid":{"rendered":"https:\/\/void-tech.cn\/?p=195"},"modified":"2025-07-04T17:59:04","modified_gmt":"2025-07-04T09:59:04","slug":"linux-netools-virus","status":"publish","type":"post","link":"https:\/\/void-tech.cn\/index.php\/2025\/07\/04\/linux-netools-virus\/","title":{"rendered":"\u3010Linux\u8fd0\u7ef4\u3011\u670d\u52a1\u5668\u611f\u67d3netools\u75c5\u6bd2\u6392\u67e5"},"content":{"rendered":"

0x00 \u524d\u8a00<\/h1>\n

\u670b\u53cb\u5b9e\u9a8c\u5ba4\u65b0\u914d\u4e86\u4e00\u53f0\u6df1\u5ea6\u5b66\u4e60\u670d\u52a1\u5668\uff0c\u4f46\u662f\u8dd1\u9879\u76ee\u603b\u662f\u83ab\u540d\u5176\u5999\u88abkilled\uff0c\u6392\u67e5\u4e86\u4f46\u6ca1\u67e5\u51fa\u6765\u53ef\u80fd\u7684\u539f\u56e0\uff0c\u4e8e\u662f\u8ba9\u6211\u5e2e\u5fd9\u770b\u770b\u662f\u600e\u4e48\u56de\u4e8b\u3002\u5177\u4f53\u8868\u73b0\u4e3a\u670d\u52a1\u5668\u8fdb\u7a0b\u4f1a\u88ab\u968f\u673akilled\uff0c\u4e14\u670d\u52a1\u5668cpu\u5360\u7528\u6301\u7eed\u8fbe\u5230100%\u3002<\/p>\n

\u521d\u6b65\u6000\u7591\u65b9\u5411\uff1a\u6709\u75c5\u6bd2\uff1b\u670d\u52a1\u5668\u88abDDoS\uff1b\u6709\u4eba\u8dd1\u4e86\u4e00\u4e2a\u6574\u4eba\u811a\u672c\u4e00\u76f4\u8fd0\u884ckill -9\uff08\u8bef\uff09<\/p>\n

0x01 \u6392\u67e5<\/h1>\n

\u670d\u52a1\u5668\u8fd0\u884c\u7684\u662fUbuntu\u7cfb\u7edf\uff0c\u662famd epyc\u7684\u5904\u7406\u5668256\u7ebf\u7a0b\uff0c\u6027\u80fd\u633a\u5f3a\u7684\uff0c\u57fa\u672c\u6392\u9664\u67d0\u4e2a\u7cfb\u7edf\u8fdb\u7a0b\u5403\u6ee1\u7684\u53ef\u80fd\u3002<\/p>\n

\"\"<\/div><\/a><\/p>\n

\u65e2\u7136\u6392\u9664\u4e86\u7cfb\u7edf\u95ee\u9898\uff0c\u90a3\u7740\u91cd\u5206\u6790\u5f02\u5e38\u8fdb\u7a0b\u3002<\/p>\n

\u5148\u7528\u5e38\u89c4\u624b\u6bb5\uff0chtop\u548ctop\u505a\u5206\u6790\u3002<\/p>\n

htop\u6ca1\u770b\u5230\u6709\u7a0b\u5e8f\u5360\u7528cpu\uff0ctop\u7528<Shift + H>\u663e\u793a\u6240\u6709\u8fdb\u7a0b\uff0c\u4f9d\u65e7\u6ca1\u6709\u4efb\u4f55\u7ebf\u7d22\u3002<\/p>\n

\u9042\u7528ps\u67e5\u770b<\/p>\n

ps -aux | sort -rnk 3 | head -5<\/pre>\n
\u4ecd\u7136\u65e0\u679c\u3002\u6000\u7591\u662f\u4e2a\u75c5\u6bd2\u8eb2\u5728\u540e\u53f0\uff0c\u6240\u4ee5\u6293\u4e0d\u51fa\u6765\u3002<\/p>\n
\u7a81\u7136\u60f3\u8d77\u6765\u4f1a\u4e0d\u4f1a\u662f\u6709\u522b\u7684\u7528\u6237\u767b\u5f55\u5728\u8dd1\u4e1c\u897f\uff0c\u4e8e\u662f\u4e4e\uff0cw\u548cwho\u4e86\u4e00\u4e0b\uff0c\u4e5f\u6ca1\u770b\u51fa\u6765\u6709\u5f02\u5e38\u3002<\/p>\n
\u8fd9\u65f6deepseek\u63d0\u793a\u6211\uff0c\u53ef\u80fd\u662f\u4e2d\u65ad\u5360\u7528\uff0c\u5bfc\u81f4cpu\u5728\u5904\u7406\u4e2d\u65ad\uff0c\u4e8e\u662f\u8fdb\u884c\u67e5\u8be2<\/p>\n
 <\/p>\n
 <\/p>\n
\u786c\u4e2d\u65ad\u6c47\u603b\uff08\u6309\u4e2d\u65ad\u7c7b\u578b\u7edf\u8ba1\u524d10\uff09<\/p>\n
awk '{if(NR>1){irq=$1; sum=0; for(i=2;i<=NF-3;i++){if($i~\/^[0-9]+$\/)sum+=$i}}; if(NR>1) print irq, sum}' \/proc\/interrupts | sort -k2 -nr | head -10<\/pre>\n
\u8f6f\u4e2d\u65ad\u6c47\u603b\uff08\u6309\u7c7b\u578b\u7edf\u8ba1\uff09<\/p>\n
cat \/proc\/softirqs | awk 'NR==1 {print} {if(NR>1){printf \"%s \", $1; sum=0; for(i=2;i<=NF;i++){if($i~\/^[0-9]+$\/)sum+=$i}; print sum}}' | sort -k2 -nr<\/pre>\n
 <\/p>\n
 <\/p>\n
\u8dd1\u4e86\u4e00\u4e0b\uff0c\u597d\u5bb6\u4f19\uff0c\u4e2d\u65ad\u4e00\u5927\u5806\u3002<\/p>\n
\u786c\u4e2d\u65ad\u4e2d\uff0cLOC: 1429530485\uff0cCAL: 52816924\uff1b\u8f6f\u4e2d\u65ad\u4e2d\uff0cRCU: 537699079\uff0cSCHED: 97051681<\/p>\n
\u6b63\u6253\u7b97\u6392\u67e5\u662f\u5426\u662f\u786c\u4ef6\u95ee\u9898\u6216\u8005kernel\u7684\u95ee\u9898\u65f6\uff0c\u7a81\u7136\u60f3\u8d77\u6765mpstat -P ALL\u7528\u4e00\u4e0b\u3002<\/p>\n
 mpstat -P ALL<\/pre>\n
\u7ed3\u679c\u53d1\u73b0\uff0cCPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle\u51e0\u9879\u4e2d\uff1a<\/p>\n
 <\/p>\n
%irq %soft\uff08\u786c\u4e2d\u65ad\u3001\u8f6f\u4e2d\u65ad\uff09\u57fa\u672c\u90fd\u662f0\u6216\u80050.1<\/p>\n
%usr\uff08\u7528\u6237\u6001\uff09\u57fa\u672c\u90fd\u662f100\u6216\u800599<\/p>\n
\u610f\u8bc6\u5230\u548c\u4e2d\u65ad\u57fa\u672c\u65e0\u5173\uff0c\u5c3d\u53ef\u80fd\u6293\u75c5\u6bd2\u3002<\/p>\n
\u9042\u7528strace\u5224\u65ad\u4e00\u4e0b\uff0c\u53d1\u73b0\u7a0b\u5e8f\u663e\u793a<\/p>\n
+++ killed by SIGKILL +++<\/pre>\n
\u5927\u5f7b\u5927\u609f\u4e86\uff0c\u6709\u75c5\u6bd2\u4e00\u76f4\u5728kill -9\u7a0b\u5e8f\uff0c\u5bfc\u81f4\u6ca1\u529e\u6cd5\u6b63\u5e38\u8fd0\u884c<\/p>\n
\u539f\u672c\u60f3\u7528bcc\u6293\u4e00\u4e0b\u7a0b\u5e8f\uff0c\u4f46\u662f\u4e0b\u8f7d\u4e5f\u4e00\u53ea\u88abkill\uff0c\u9042\u653e\u5f03\u3002<\/p>\n
\u7528pidstat -u 1\u6253\u7b97\u67e5\u67e5\u662f\u4ec0\u4e48\u4e1c\u897f\u4e00\u76f4\u5728\u540e\u53f0\uff0c\u770b\u4e86\u4e00\u4e0b\u4e5f\u6ca1\u6293\u5230<\/p>\n
perf record -g -a sleep 10<\/pre>\n
\u53c8\u5c1d\u8bd5\u7528perf\u6293\u75c5\u6bd2\uff0c\u4f46\u662f\u8fd8\u662f\u65e0\u679c\uff0c\u8fc7\u4e86\u4f1a\u513f\u75c5\u6bd2\u628a\u6211\u7684perf\u4e5fkill\u4e86<\/p>\n
 <\/p>\n
bpftrace -e 'tracepoint:syscalls:sys_enter_exec { printf(\"%s %d\\n\", comm, pid); }'<\/pre>\n
\u6ca1\u529e\u6cd5\uff0c\u7528bpftrace\u770b\u770b\u4e8c\u8fdb\u5236\u8c03\u7528\uff0c\u6ca1\u770b\u51fa\u4ec0\u4e48\u7384\u673a\uff0c\u4f46\u662f\u770b\u5230\u5f88\u591aiptables\u548cufw\u7684\u64cd\u4f5c\uff0c\u6000\u7591\u662f\u75c5\u6bd2\u5728\u5b9a\u65f6\u5173\u95ed\u9632\u706b\u5899<\/p>\n
\u7a81\u7136\u60f3\u8d77\u4e86unhide\uff0c\u53ef\u4ee5\u7528\u6765\u6293\u9690\u85cf\u7684\u8fdb\u7a0b\uff0c\u9042\u4e0a\u624b<\/p>\n
unhide proc<\/pre>\n
\u7ed3\u679c\u4e5f\u6ca1\u770b\u5230\u75c5\u6bd2\u7684\u5f71\u5b50<\/p>\n
\u53c8\u67e5\u4e86\u4e00\u4e0bcrontab\uff0c\u7528\u6237\u7684\u548c\u7cfb\u7edf\u7684\uff0c\u8fd8\u662f\u6ca1\u67e5\u51fa\u7384\u673a\u3002<\/p>\n
\u672c\u6765\u505a\u5230\u8fd9\uff0c\u5df2\u7ecf\u9ed4\u9a74\u6280\u7a77\u4e86\uff0c\u6253\u7b97\u5411\u75c5\u6bd2\u4f4e\u5934\uff08bushi\uff09\u6253\u7b97\u8ba9\u670b\u53cb\u91cd\u88c5\u4e00\u4e0b\u670d\u52a1\u5668\u7cfb\u7edf\u3002<\/p>\n
\u7a81\u7136\u8111\u5b50\u91cc\u5192\u51fa\u6765\u4e86\u4e00\u4e2a\u7a0b\u5e8f\u2014\u2014powertop\uff0c\u662f\u7b14\u8bb0\u672c\u7535\u8111\u4e0a\u7528\u6765\u76d1\u6d4b\u8017\u7535\u7a0b\u5e8f\u7684\u3002\u672c\u7740\u6b7b\u9a6c\u5f53\u6d3b\u9a6c\u533b\u7684\u5fc3\u6001\uff0c\u88c5\u4e86\u4e00\u4e2a\u3002<\/p>\n
powertop\u8dd1\u8d77\u6765\u4ee5\u540e\uff0c\u679c\u7136\u663e\u793a\u4e86\u8017\u7535\u7a0b\u5e8f\uff0c\u5728\u91cc\u9762\uff0c\u6211\u770b\u5230\u4e00\u4e2a\u8eab\u5f71\uff1a<\/p>\n
 \/dev\/shm\/netools --tls<\/pre>\n
\u6211\u7a81\u7136\u6709\u4e86\u4e00\u79cd\u660e\u767d\u4e86\u7684\u611f\u89c9\uff0c\u5c31\u50cf\u662f aha moment\u4e00\u6837\u3002<\/p>\n
 <\/p>\n
\u8fd9\u5c31\u662f\u627e\u4e86\u534a\u5929\u7684\u75c5\u6bd2\uff0c\u6765\u505a\u4e2a\u7b80\u5355\u7684\u5206\u6790\u3002\/dev\/shm\u662f\u4e00\u4e2a\u5229\u7528\u5185\u5b58\u865a\u62df\u51fa\u6765\u7684\u4e34\u65f6\u6587\u4ef6\u7cfb\u7edf\uff0c\u75c5\u6bd2\u5c06\u81ea\u8eab\u85cf\u5728\u91cc\u9762\uff0c\u907f\u514d\u88ab\u7cfb\u7edf\u8fdb\u7a0b\u68c0\u6d4b\u5230\u3002netools\u5f88\u660e\u663e\u662fneta\u4e86linux\u4e0b\u7684\u5e38\u7528\u5de5\u5177\u96c6net-tools\uff08ifconfig\u7b49\u5e38\u7528\u6307\u4ee4\u90fd\u5728\u8fd9\u4e2a\u5de5\u5177\u96c6\u4e2d\uff09\uff0c\u6709\u70b9\u50cf\u662fWindows\u4e0b\u5192\u51fa\u6765\u4e00\u4e2aexploere.exe\u7684\u611f\u89c9\uff08explorer.exe\u662fWindows\u8d44\u6e90\u7ba1\u7406\u5668\uff09\uff1btls\u5219\u662f\u8fd9\u4e2a\u6316\u77ff\u75c5\u6bd2\u8d70\u52a0\u5bc6\u6d41\u91cf\u8fde\u63a5\u5230\u77ff\u6c60\u4e4b\u7c7b\u7684\uff0c\u540c\u65f6\u907f\u514d\u6d41\u91cf\u88ab\u53d1\u73b0\u3002<\/p>\n
systemctl list-unit-files |<\/span> grep<\/span> enabled<\/pre>\n
\u5df2\u7ecf\u6709\u65b9\u5411\u4e86\uff0c\u4e8e\u662f\u5217\u51fa\u6240\u6709\u670d\u52a1\uff0c\u679c\u7136\u627e\u5230\u4e86\u51e0\u6761\u968f\u673a\u4ee3\u7801\u540d\u5b57\u7684\u670d\u52a1\uff0c\u505c\u7528\u4e4b\u540e\u987a\u7740service\u987a\u85e4\u6478\u74dc\uff0c\u5728bin\u91cc\u9762\u627e\u5230\u4e86\u75c5\u6bd2\u7684\u4e8c\u8fdb\u5236\u6587\u4ef6\uff0c\u8fc5\u901f\u7684\u53d6\u6d88\u4e86\u4ed6\u7684\u53ef\u6267\u884c\u6743\u9650\u3002<\/p>\n
\u81f3\u6b64\uff0c\u75c5\u6bd2\u88ab\u5173\u95ed\uff0c\u670d\u52a1\u5668\u5360\u7528\u6062\u590d\u6b63\u5e38\uff0c\u6392\u67e5\u6210\u529f\u3002<\/p>\n
0x02 \u8bf1\u56e0<\/h1>\n
\u73b0\u5728\u67e5\u5b8c\u4e86\u75c5\u6bd2\uff0c\u89e3\u51b3\u4e86\u71c3\u7709\u4e4b\u6025\uff0c\u8be5\u4e8b\u540e\u8bf8\u845b\u4eae\u4e86\uff0c\u75c5\u6bd2\u662f\u600e\u4e48\u8fdb\u6765\u7684\uff1f<\/p>\n
\u5206\u6790\u4e00\u4e0b\u540e\uff0c\u53d1\u73b0\u670b\u53cb\u7684\u670d\u52a1\u5668\u6709\u51e0\u4e2a\u7279\u70b9\uff1a<\/p>\n
    \n
  1. \u670d\u52a1\u5668\u7684ssh\u6709\u516c\u7f51\u8bbf\u95ee\u6743\u9650\uff08\u5c3d\u7ba1\u5e76\u975e\u9ed8\u8ba4\u7aef\u53e3\uff09<\/li>\n
  2. \u670d\u52a1\u5668\u7528\u4e86\u5f31\u5bc6\u7801\uff08\u4ec5\u51e0\u4e2a\u5c0f\u5199\u5b57\u6bcd\uff09<\/li>\n
  3. \u670d\u52a1\u5668\u7684root\u6ca1\u6709\u7981\u6b62\u767b\u5f55<\/li>\n<\/ol>\n
    \u9042\u67e5\u8be2<\/p>\n
    view \/log\/sys\/auth.log<\/pre>\n
    \u679c\u7136\u53d1\u73b0\u5927\u91cf\u7206\u7834\u8bb0\u5f55\uff0c\u6709\u6765\u81ea\u4e16\u754c\u5404\u5730\u7684ip\uff08\u5305\u62ec\u7f57\u9a6c\u5c3c\u4e9a \u8377\u5170\u7b49\uff09\u5bf9\u670d\u52a1\u5668\u7684ssh\u505a\u7206\u7834\uff0c\u9488\u5bf9root\u8d26\u53f7\uff0c141000\u591a\u884c\u591a\u884c\uff0c\u975e\u5e38\u6050\u6016\u3002<\/p>\n
    \u56e0\u6b64\uff0c\u672c\u6b21\u4e8b\u4ef6\u5927\u6982\u7387\u662f\uff0c\u7531\u4e8e\u5f31\u5bc6\u7801+\u516c\u7f51+root\u6ca1\u6709\u7981\u7528\u767b\u5f55\uff0c\u5bfc\u81f4\u4e8b\u6545\u94fe\u88ab\u51fb\u7a7f\uff0c\u5f15\u53d1\u7684\u3002<\/p>\n
    \u67e5\u8be2\uff1agrep “^root:” \/etc\/passwd\uff0c\u679c\u7136\u5f97\u5230\uff1aroot:x:0:0:root:\/root:\/bin\/bash\uff0c\u4e14\/etc\/ssh\/sshd_config\u4e2d\u672a\u5bf9root\u767b\u5f55\u505a\u9650\u5236\u3002<\/p>\n
    \u8fc5\u901f\u5730\u505a\u4e86\u8865\u6551\u63aa\u65bd\uff0c\u5728sshd_config\u6dfb\u52a0\uff1a<\/p>\n
    PermitRootLogin no<\/pre>\n
    \u968f\u540e\u91cd\u542fsshd\u670d\u52a1<\/p>\n
    \u4f7f\u7528<\/p>\n
    sudo usermod -s \/usr\/sbin\/nologin root<\/pre>\n
    \u76f4\u63a5\u5f7b\u5e95\u7981\u7528root\u767b\u5f55\uff08\u5305\u62ec\u63a7\u5236\u53f0\uff09\uff0c\u73b0\u5728root\u53ea\u80fd\u901a\u8fc7sudo\u8c03\u7528\uff0c\u6700\u5927\u9650\u5ea6\u4fdd\u8bc1\u5b89\u5168\u3002<\/p>\n
    0x03 \u601d\u8003<\/h1>\n
    \u672c\u6b21\u4e8b\u6545\uff0c\u8bf4\u5927\u4e0d\u5927\uff0c\u8bf4\u5c0f\u4e0d\u5c0f\u3002\u56e0\u4e3a\u662f\u65b0\u914d\u7f6e\u7684\u670d\u52a1\u5668\uff0c\u4e5f\u6ca1\u6709\u4ec0\u4e48\u654f\u611f\u6570\u636e\u6216\u4e1a\u52a1\u6570\u636e\uff0c\u9664\u4e86\u635f\u5931\u7535\u8d39\u548c\u65f6\u95f4\u4e4b\u5916\uff0c\u786e\u5b9e\u4e5f\u6ca1\u4ec0\u4e48\u5173\u7cfb\u3002<\/p>\n
    \u8fd9\u56de\u88ab\u653b\u51fb \u4e3b\u8981\u662f\u51e0\u70b9:<\/p>\n
      \n
    1. \u5f31\u5bc6\u7801\uff0c\u8fd9\u662f\u4e3b\u8981\u8bf1\u53d1\u56e0\u7d20\uff0c\u5f31\u5bc6\u7801\u5bb9\u6613\u88ab\u7206\u7834\uff0c\u4ece\u800c\u5bfc\u81f4\u5bf9\u65b9\u767b\u9646\u670d\u52a1\u5668\u3002<\/li>\n
    2. root\u8d26\u6237\u6ca1\u6709\u7981\u7528\uff0c\u4e3a\u7206\u7834\u63d0\u4f9b\u4e86\u53ef\u4e58\u4e4b\u673a\uff0c\u5b89\u88c5linux\u7684\u65f6\u5019\u5c31\u4e0d\u5e94\u8be5\u542f\u7528root\u8d26\u6237\u7684\u767b\u9646\uff0c\u76f4\u63a5\u4e0d\u8981\u7528root\uff0c\u73b0\u5728\u57fa\u672c\u6240\u6709\u7684\u53d1\u884c\u7248\u90fd\u53ef\u4ee5\u76f4\u63a5\u7981\u7528root\uff0c\u8ba9root\u65e0\u6cd5\u767b\u9646\uff08\u628aroot\u8bbe\u4e3anologin\u5e76\u4e14\u7981\u6b62root\u4ecessh\u767b\u9646\uff09\u3002<\/li>\n
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