{"id":2203,"date":"2020-07-30T11:39:46","date_gmt":"2020-07-30T03:39:46","guid":{"rendered":"http:\/\/39.97.231.10\/?p=2203"},"modified":"2020-07-30T11:39:46","modified_gmt":"2020-07-30T03:39:46","slug":"linux%e7%b3%bb%e7%bb%9f%e5%85%a5%e4%be%b5%e6%a3%80%e6%b5%8b","status":"publish","type":"post","link":"http:\/\/www.weijing.co\/?p=2203","title":{"rendered":"linux\u7cfb\u7edf\u5165\u4fb5\u68c0\u6d4b"},"content":{"rendered":"<p>\u5728\u65e5\u5e38\u7e41\u7410\u7684\u8fd0\u7ef4\u5de5\u4f5c\u4e2d\uff0c\u5bf9linux\u670d\u52a1\u5668\u8fdb\u884c\u5b89\u5168\u68c0\u67e5\u662f\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u73af\u8282\u3002\u5982\u4f55\u68c0\u67e5linux\u7cfb\u7edf\u662f\u5426\u906d\u53d7\u4e86\u5165\u4fb5\uff1f<br \/>\n\u4e00\u3001\u662f\u5426\u5165\u4fb5\u68c0\u67e5<br \/>\n1\uff09\u68c0\u67e5\u7cfb\u7edf\u65e5\u5fd7<br \/>\n\u68c0\u67e5\u7cfb\u7edf\u9519\u8bef\u767b\u9646\u65e5\u5fd7\uff0c\u7edf\u8ba1IP\u91cd\u8bd5\u6b21\u6570\uff08last\u547d\u4ee4\u662f\u67e5\u770b\u7cfb\u7edf\u767b\u9646\u65e5\u5fd7\uff0c\u6bd4\u5982\u7cfb\u7edf\u88abreboot\u6216\u767b\u9646\u60c5\u51b5\uff09<br \/>\n[root@localhost ~]# last<br \/>\n2\uff09\u68c0\u67e5\u7cfb\u7edf\u7528\u6237<br \/>\n\u67e5\u770b\u662f\u5426\u6709\u5f02\u5e38\u7684\u7cfb\u7edf\u7528\u6237<br \/>\n[root@localhost ~]# cat \/etc\/passwd<br \/>\n\u67e5\u770b\u662f\u5426\u4ea7\u751f\u4e86\u65b0\u7528\u6237\uff0cUID\u548cGID\u4e3a0\u7684\u7528\u6237<br \/>\n[root@localhost ~]# grep \\&#8221;0\\&#8221; \/etc\/passwd<br \/>\n\u67e5\u770bpasswd\u7684\u4fee\u6539\u65f6\u95f4\uff0c\u5224\u65ad\u662f\u5426\u5728\u4e0d\u77e5\u7684\u60c5\u51b5\u4e0b\u6dfb\u52a0\u7528\u6237<br \/>\n[root@localhost ~]# ls -l \/etc\/passwd<br \/>\n\u67e5\u770b\u662f\u5426\u5b58\u5728\u7279\u6743\u7528\u6237<br \/>\n[root@localhost ~]# awk -F: \\&#8217;$3==0 {print $1}\\&#8217; \/etc\/passwd<br \/>\n\u67e5\u770b\u662f\u5426\u5b58\u5728\u7a7a\u53e3\u4ee4\u5e10\u6237<br \/>\n[root@localhost ~]# awk -F: \\&#8217;length($2)==0 {print $1}\\&#8217; \/etc\/shadow<br \/>\n3\uff09\u68c0\u67e5\u5f02\u5e38\u8fdb\u7a0b<br \/>\n\u6ce8\u610fUID\u4e3a0\u7684\u8fdb\u7a0b<br \/>\n\u4f7f\u7528ps -ef\u547d\u4ee4\u67e5\u770b\u8fdb\u7a0b<br \/>\n\u5bdf\u770b\u8be5\u8fdb\u7a0b\u6240\u6253\u5f00\u7684\u7aef\u53e3\u548c\u6587\u4ef6<br \/>\n[root@localhost ~]# lsof -p pid\u547d\u4ee4\u67e5\u770b<br \/>\n\u68c0\u67e5\u9690\u85cf\u8fdb\u7a0b<br \/>\n[root@localhost ~]# ps -ef | awk \\'{print }\\&#8217; | sort -n | uniq &gt;1<br \/>\n[root@localhost ~]# ls \/porc |sort -n|uniq &gt;2<br \/>\n[root@localhost ~]# diff 1 2<br \/>\n4\uff09\u68c0\u67e5\u5f02\u5e38\u7cfb\u7edf\u6587\u4ef6<br \/>\n[root@localhost ~]# find \/ -uid 0 \u2013perm -4000 \u2013print<br \/>\n[root@localhost ~]# find \/ -size +10000k \u2013print<br \/>\n[root@localhost ~]# find \/ -name \\&#8221;\u2026\\&#8221; \u2013print<br \/>\n[root@localhost ~]# find \/ -name \\&#8221;..\\&#8221; \u2013print<br \/>\n[root@localhost ~]# find \/ -name \\&#8221;.\\&#8221; \u2013print<br \/>\n[root@localhost ~]# find \/ -name \\&#8221; \\&#8221; \u2013print<br \/>\n5\uff09\u68c0\u67e5\u7cfb\u7edf\u6587\u4ef6\u5b8c\u6574\u6027<br \/>\n[root@localhost ~]# rpm \u2013qf \/bin\/ls<br \/>\n[root@localhost ~]# rpm -qf \/bin\/login<br \/>\n[root@localhost ~]# md5sum \u2013b \u6587\u4ef6\u540d<br \/>\n[root@localhost ~]# md5sum \u2013t \u6587\u4ef6\u540d<br \/>\n6\uff09\u68c0\u67e5RPM\u7684\u5b8c\u6574\u6027<br \/>\n[root@localhost ~]# rpm -Va #\u6ce8\u610f\u76f8\u5173\u7684\/sbin,\/bin,\/usr\/sbin,\/usr\/bin<br \/>\n\u8f93\u51fa\u683c\u5f0f\u8bf4\u660e\uff1a<br \/>\nS \u2013 File size differs<br \/>\nM \u2013 Mode differs (permissions)<br \/>\n5 \u2013 MD5 sum differs<br \/>\nD \u2013 Device number mismatch<br \/>\nL \u2013 readLink path mismatch<br \/>\nU \u2013 user ownership differs<br \/>\nG \u2013 group ownership differs<br \/>\nT \u2013 modification time differs<br \/>\n7\uff09\u68c0\u67e5\u7f51\u7edc<br \/>\n[root@localhost ~]# ip link | grep PROMISC\uff08\u6b63\u5e38\u7f51\u5361\u4e0d\u8be5\u5728promisc\u6a21\u5f0f\uff0c\u53ef\u80fd\u5b58\u5728sniffer\uff09<br \/>\n[root@localhost ~]# lsof \u2013i<br \/>\n[root@localhost ~]# netstat \u2013nap\uff08\u5bdf\u770b\u4e0d\u6b63\u5e38\u6253\u5f00\u7684TCP\/UDP\u7aef\u53e3)<br \/>\n[root@localhost ~]# arp \u2013a<br \/>\n8\uff09\u68c0\u67e5\u7cfb\u7edf\u8ba1\u5212\u4efb\u52a1<br \/>\n[root@localhost ~]# crontab \u2013u root \u2013l<br \/>\n[root@localhost ~]# cat \/etc\/crontab<br \/>\n[root@localhost ~]# ls \/etc\/cron.*<br \/>\n9\uff09\u68c0\u67e5\u7cfb\u7edf\u540e\u95e8<br \/>\n[root@localhost ~]# cat \/etc\/crontab<br \/>\n[root@localhost ~]# ls \/var\/spool\/cron\/<br \/>\n[root@localhost ~]# cat \/etc\/rc.d\/rc.local<br \/>\n[root@localhost ~]# ls \/etc\/rc.d<br \/>\n[root@localhost ~]# ls \/etc\/rc3.d<br \/>\n10\uff09\u68c0\u67e5\u7cfb\u7edf\u670d\u52a1<br \/>\n[root@localhost ~]# chkconfig \u2014list<br \/>\n[root@localhost ~]# rpcinfo -p\uff08\u67e5\u770bRPC\u670d\u52a1\uff09<br \/>\n11\uff09\u68c0\u67e5rootkit<br \/>\n[root@localhost ~]# rkhunter -c<br \/>\n[root@localhost ~]# chkrootkit -q<br \/>\n\u4e8c\u3001linux\u7cfb\u7edf\u88ab\u5165\u4fb5\/\u4e2d\u6bd2\u7684\u8868\u8c61<br \/>\n\u6bd4\u8f83\u5e38\u89c1\u7684\u4e2d\u6bd2\u8868\u73b0\u5728\u4ee5\u4e0b\u4e09\u4e2a\u65b9\u9762\uff1a<br \/>\n1\uff09\u670d\u52a1\u5668\u51fa\u53bb\u7684\u5e26\u5bbd\u4f1a\u8dd1\u9ad8\u8fd9\u4e2a\u662f\u4e2d\u6bd2\u7684\u4e00\u4e2a\u7279\u5f81\u3002<br \/>\n\u56e0\u4e3a\u670d\u52a1\u5668\u4e2d\u6bd2\u4e4b\u540e\u88ab\u522b\u4eba\u62ff\u53bb\u5229\u7528\uff0c\u5e38\u89c1\u7684\u5c31\u662f\u62ff\u53bb\u5f53\u8089\u9e21\u653b\u51fb\u522b\u4eba\uff1b\u518d\u8005\u5c31\u662f\u62ff\u4f60\u7684\u6570\u636e\u4e4b\u7c7b\u7684\u3002<br \/>\n\u6240\u4ee5\u670d\u52a1\u5668\u5e26\u5bbd\u65b9\u9762\u9700\u8981\u7279\u522b\u6ce8\u610f\u4e0b\uff0c\u5982\u679c\u670d\u52a1\u5668\u51fa\u53bb\u7684\u5e26\u5bbd\u8dd1\u5f88\u9ad8\uff0c\u90a3\u80af\u5b9a\u6709\u4e9b\u5f02\u5e38\uff0c\u9700\u8981\u53ca\u65f6\u68c0\u67e5\u4e00\u4e0b\uff01<br \/>\n2\uff09\u7cfb\u7edf\u91cc\u4f1a\u4ea7\u751f\u591a\u4f59\u7684\u4e0d\u660e\u7684\u7528\u6237<br \/>\n\u4e2d\u6bd2\u6216\u8005\u88ab\u5165\u4fb5\u4e4b\u540e\u4f1a\u5bfc\u81f4\u7cfb\u7edf\u91cc\u4ea7\u751f\u4e00\u4e9b\u4e0d\u660e\u7528\u6237\u6216\u8005\u767b\u9646\u65e5\u5fd7\uff0c\u6240\u4ee5\u8fd9\u65b9\u9762\u7684\u68c0\u67e5\u4e5f\u662f\u53ef\u4ee5\u770b\u51fa\u4e00\u4e9b\u5f02\u5e38\u7684\u3002<br \/>\n3\uff09\u5f00\u673a\u662f\u5426\u542f\u52a8\u4e00\u4e9b\u4e0d\u660e\u670d\u52a1\u548ccrond\u4efb\u52a1\u91cc\u662f\u5426\u6709\u4e00\u4e9b\u6765\u5386\u4e0d\u660e\u7684\u4efb\u52a1\uff1f<br \/>\n\u56e0\u4e3a\u4e2d\u6bd2\u4f1a\u968f\u7cfb\u7edf\u7684\u542f\u52a8\u800c\u542f\u52a8\u7684\uff0c\u6240\u4ee5\u4e00\u822c\u4f1a\u5f00\u673a\u542f\u52a8\uff0c\u68c0\u67e5\u4e00\u4e0b\u542f\u52a8\u7684\u670d\u52a1\u6216\u8005\u6587\u4ef6\u662f\u5426\u6709\u5f02\u5e38\uff0c\u4e00\u822c\u4f1a\u5728\/etc\/rc.local\u548ccrondtab -l \u663e\u793a\u51fa\u6765\u3002<br \/>\n\u4e09\u3001\u987a\u4fbf\u8bf4\u4e0b\u4e00\u6b21Linux\u7cfb\u7edf\u88ab\u5165\u4fb5\/\u4e2d\u6bd2\u7684\u89e3\u51b3\u8fc7\u7a0b<br \/>\n\u5728\u5de5\u4f5c\u4e2d\u78b0\u5230\u7cfb\u7edf\u7ecf\u5e38\u5361\uff0c\u800c\u4e14\u6709\u65f6\u5019\u8fdc\u7a0b\u8fde\u63a5\u4e0d\u4e0a\uff0c\u4ece\u672c\u5730\u4ee5\u53ca\u8fdc\u7a0b\u68c0\u67e5\u4e00\u4e0b\u8fd9\u4e2a\u7cfb\u7edf\uff0c\u53d1\u73b0\u6709\u4e0d\u660e\u7684\u7cfb\u7edf\u8fdb\u7a0b\u3002<br \/>\n\u521d\u6b65\u5224\u65ad\u5c31\u662f\u53ef\u80fd\u4e2d\u6bd2\u4e86\uff01\uff01\uff01<br \/>\n\u89e3\u51b3\u8fc7\u7a0b\uff1a<br \/>\n1\uff09\u5728\u76d1\u63a7\u91cc\u68c0\u67e5\u4e00\u4e0b\u8fd9\u53f0\u670d\u52a1\u5668\u7684\u5e26\u5bbd\uff0c\u53d1\u73b0\u670d\u52a1\u5668\u51fa\u53bb\u7684\u5e26\u5bbd\u8dd1\u5f88\u9ad8\uff0c\u6240\u4ee5\u624d\u4f1a\u5bfc\u81f4\u8fdc\u7a0b\u8fde\u63a5\u5361\u751a\u81f3\u8fde\u63a5\u4e0d\u4e0a\uff0c\u8fd9\u662f\u4e00\u4e2a\u539f\u56e0\u3002<br \/>\n\u4e3a\u4ec0\u4e48\u670d\u52a1\u5668\u51fa\u53bb\u7684\u5e26\u5bbd\u8fd9\u4e48\u9ad8\u4e14\u8d85\u51fa\u4e86\u5f00\u901a\u7684\u5e26\u5bbd\u503c\uff1f\u8fd9\u4e2a\u539f\u56e0\u53ea\u80fd\u8fdb\u5165\u670d\u52a1\u5668\u7cfb\u7edf\u91cc\u68c0\u67e5\u4e86\u3002<br \/>\n2\uff09\u8fdc\u7a0b\u8fdb\u5165\u7cfb\u7edf\u91cc\u68c0\u67e5\u4e86\u4e0b\uff0c ps -aux\u67e5\u5230\u4e0d\u660e\u8fdb\u7a0b \uff0c\u7acb\u523b\u5173\u95ed\u5b83\u3002<br \/>\n3\uff09\u68c0\u67e5\u4e00\u4e0b\u5f00\u673a\u542f\u52a8\u9879\uff1a<br \/>\nchkconfig &#8211;list | grep 3:on<br \/>\n\u670d\u52a1\u5668\u542f\u52a8\u7ea7\u522b\u662f3\u7684\uff0c\u6211\u68c0\u67e5\u4e00\u4e0b\u4e86\u5f00\u673a\u542f\u52a8\u9879\uff0c\u6ca1\u6709\u7279\u522b\u660e\u663e\u7684\u670d\u52a1\u3002<br \/>\n\u7136\u540e\u68c0\u67e5\u4e86\u4e00\u4e0b\u5f00\u673a\u542f\u52a8\u7684\u4e00\u4e2a\u6587\u4ef6<br \/>\nmore \/etc\/rc.local<br \/>\n\u770b\u5230\u8fd9\u4e2a\u6587\u4ef6\u91cc\u88ab\u6dfb\u52a0\u4e86\u5f88\u591a\u672a\u77e5\u9879\uff0c\u6ce8\u91ca\u4e86\u5b83\u3002<br \/>\n4\uff09\u7136\u540e\u5728\u8fdc\u7a0b\u8fde\u63a5\u8fd9\u53f0\u670d\u52a1\u5668\u7684\u65f6\u5019\uff0c\u8fd8\u662f\u6709\u4e9b\u5361\u3002<br \/>\n\u68c0\u67e5\u4e86\u4e00\u4e0b\u7cfb\u7edf\u7684\u8ba1\u5212\u4efb\u52a1crond\uff0c\u4f7f\u7528crondtab -l \u547d\u4ee4\u8fdb\u884c\u67e5\u770b\uff0c\u770b\u5230\u5f88\u591a\u6ce8\u91ca\u884c\u3002<br \/>\n\u8fd9\u4e9b\u6ce8\u91ca\u884c\u4e0e\/etc\/rc.local\u7684\u5185\u5bb9\u5dee\u4e0d\u591a\u3002\u6700\u540e\u5907\u4efd\u4e0b\/var\/spool\/cron\/root\u6587\u4ef6\uff08\u4e5f\u5c31\u662froot\u4e0b\u7684crontab\u8ba1\u5212\u4efb\u52a1\u5185\u5bb9\uff09\uff0c\u5c31\u5220\u9664\u4e86crontab\u5185\u5bb9\uff0c\u7136\u540e\u505c\u6b62crond\u4efb\u52a1\uff0c\u5e76chkconfig crond off \u7981\u7528\u5b83\u5f00\u673a\u542f\u52a8\u3002<br \/>\n5\uff09\u4e3a\u4e86\u5f7b\u5e95\u6e05\u9664\u5371\u5bb3\uff0c\u6211\u68c0\u67e5\u4e86\u4e00\u4e0b\u7cfb\u7edf\u7684\u767b\u9646\u65e5\u5fd7\uff08last\u547d\u4ee4\u67e5\u770b\uff09\uff0c\u770b\u5230\u9664\u4e86root\u7528\u6237\u4e4b\u5916\u8fd8\u6709\u5176\u5b83\u7684\u7528\u6237\u767b\u9646\u8fc7\u3002<br \/>\n\u68c0\u67e5\u4e86\u4e00\u4e0b\/etc\/passwd \uff0c\u770b\u5230\u6709\u4e0d\u660e\u7684\u7528\u6237\uff0c\u7acb\u523b\u7528usermod -L XXX \u7981\u7528\u8fd9\u4e9b\u7528\u6237\u3002<br \/>\n\u7136\u540e\u66f4\u65b0\u4e86\u4e0b\u7cfb\u7edf\u7684\u590d\u6742\u5bc6\u7801\u3002<br \/>\n\u7981\u7528\/\u9501\u5b9a\u7528\u6237\u767b\u5f55\u7cfb\u7edf\u7684\u65b9\u6cd5<br \/>\nusermod -L username \u9501\u5b9a\u7528\u6237<br \/>\nusermod -U username \u89e3\u9501<br \/>\npasswd -l username \u9501\u5b9a\u7528\u6237<br \/>\npasswd -u username \u89e3\u9501<br \/>\n3.\u4fee\u6539\u7528\u6237\u7684shell\u7c7b\u578b\u4e3a\/sbin\/nologin\uff08\/etc\/passwd\u6587\u4ef6\u91cc\u4fee\u6539\uff09<br \/>\n4.\u5728\/etc\/\u4e0b\u521b\u5efa\u7a7a\u6587\u4ef6nologin\uff0c\u8fd9\u6837\u5c31\u9501\u5b9a\u4e86\u9664root\u4e4b\u5916\u7684\u5168\u90e8\u7528\u6237<br \/>\n\u56db\u3001\u600e\u6837\u786e\u4fddlinux\u7cfb\u7edf\u5b89\u5168<br \/>\n1\uff09\u4ece\u4ee5\u5f80\u78b0\u5230\u7684\u5b9e\u4f8b\u6765\u5206\u6790\uff0c\u5bc6\u7801\u592a\u7b80\u5355\u662f\u4e00\u4e2a\u9519<br \/>\n\u7528\u6237\u540d\u9ed8\u8ba4\uff0c\u5bc6\u7801\u592a\u7b80\u5355\u662f\u6700\u5bb9\u6613\u88ab\u5165\u4fb5\u7684\u5bf9\u8c61\uff0c\u6240\u4ee5\u5207\u5fcc\u4e0d\u8981\u4f7f\u7528\u592a\u8fc7\u4e8e\u7b80\u5355\u7684\u5bc6\u7801\uff0c\u5148\u524d\u78b0\u5230\u7684\u90a3\u4f4d\u5ba2\u6237\u5c31\u662f\u4f7f\u7528\u4e86\u592a\u7b80\u5355\u7684\u4e14\u89c4\u5219\u7684\u5bc6\u7801 1q2w3e4r5t\uff0c \u8fd9\u79cd\u5bc6\u7801\u5728\u626b\u63cf\u7684\u8f6f\u4ef6\u91cc\u662f\u901a\u7528\u7684\uff0c\u6240\u4ee5\u5f88\u5bb9\u6613\u88ab\u522b\u4eba\u626b\u63cf\u51fa\u6765\u7684\u3002<br \/>\n2\uff09\u4e0d\u8981\u4f7f\u7528\u9ed8\u8ba4\u7684\u8fdc\u7a0b\u7aef\u53e3\uff0c\u907f\u514d\u88ab\u626b\u63cf\u5230<br \/>\n\u626b\u63cf\u7684\u4eba\u90fd\u662f\u6839\u636e\u7aef\u53e3\u626b\u63cf\uff0c\u7136\u540e\u518d\u8fdb\u884c\u5bc6\u7801\u626b\u63cf\uff0c\u9ed8\u8ba4\u7684\u7aef\u53e3\u5f80\u5f80\u5c31\u662f\u626b\u63cf\u5668\u7684\u5bf9\u8c61\uff0c\u4ed6\u4eec\u626b\u63cf\u4e00\u4e2a\u5927\u7684IP \u6bb5\uff0c\u54ea\u4e9b\u5f00\u653e22\u7aef\u53e3\u4e14\u8ba4\u4e3a\u662fssh\u670d\u52a1\u7684linux\u7cfb\u7edf\uff0c\u6240\u4ee5\u624d\u4f1a\u731c\u8fd9\u673a\u5668\u7684\u5bc6\u7801\u3002\u66f4\u6539\u8fdc\u7a0b\u7aef\u53e3\u4e5f\u662f\u5b89\u5168\u7684\u4e00\u4e2a\u63aa\u65bd\uff01<br \/>\n3\uff09\u4f7f\u7528\u4e00\u4e9b\u5b89\u5168\u7b56\u7565\u8fdb\u884c\u4fdd\u62a4\u7cfb\u7edf\u5f00\u653e\u7684\u7aef\u53e3<br \/>\n\u4f7f\u7528iptables\u6216\u8005\u914d\u7f6e\/etc\/hosts.deny \u548c\/etc\/hosts.allow\u8fdb\u884c\u767d\u540d\u5355\u8bbe\u7f6e<br \/>\n\u53ef\u4ee5\u5bf9\/etc\/passwd\u3001\/etc\/group\u3001\/etc\/sudoers\u3001\/etc\/shadow\u7b49\u7528\u6237\u4fe1\u606f\u6587\u4ef6\u8fdb\u884c\u9501\u5b9a\uff08chattr +ai\uff09<br \/>\n4\uff09\u7981ping\u8bbe\u7f6e<br \/>\necho 1 &gt; \/proc\/sys\/net\/ipv4\/icmp_echo_ignore_all<br \/>\n&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212; \u53d1\u73b0\u4e00\u6b21\u670d\u52a1\u5668\u88abgetshell\u6e17\u900f\u7684\u89e3\u51b3\u529e\u6cd5\uff1a<br \/>\n1\uff09\u4f7f\u7528top\u547d\u4ee4\u53d1\u73b0\u4e00\u4e2apython\u7a0b\u5e8f\u5360\u7528\u4e8695%\u7684cpu<br \/>\n2\uff09\u4f7f\u7528ps -ef|grep python\u53d1\u73b0\u4e0b\u9762\u7a0b\u5e8f\uff1a<br \/>\npython -c import pty;pty.spamn(\\&#8221;\/bin\/sh\\&#8221;)<br \/>\n\u8fd9\u4e2a\u7a0b\u5e8f\u547d\u4ee4\u8868\u793a\u901a\u8fc7webshell\u53cd\u5f39shell\u56de\u6765\u4e4b\u540e\u83b7\u53d6\u771f\u6b63\u7684ttyshell\u8fdb\u884c\u6e17\u900f\u5230\u670d\u52a1\u5668\u91cc\u3002kill\u6389\u8fd9\u4e2a\u8fdb\u7a0b\uff01<br \/>\n3\uff09\u53d1\u73b0\u5728\/var\/spool\/cron\u4e0b\u9762\u8bbe\u7f6e\u4e86\u4e00\u4e2anobody\u7684\u5b9a\u65f6\u6267\u884c\u4e0a\u9762\u83b7\u53d6getshell\u7684\u6e17\u900f\u547d\u4ee4\uff01\u679c\u65ad\u5220\u9664\u8fd9\u4e2a\u4efb\u52a1\uff01<br \/>\n4\uff09ss -a\u53d1\u73b0\u4e00\u4e2a\u53ef\u7591ip\u4ee5\u53ca\u5b83\u7684\u8fdb\u7a0b\uff0c\u679c\u65ad\u5728iptables\u91cc\u7981\u6b62\u8fd9\u4e2aip\u7684\u6240\u6709\u8bf7\u6c42\uff1a<br \/>\n-I INPUT -s 180.125.131.192 -j DROP<br \/>\n&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211; \u6bd4\u5982\uff1a \u5728\u4e00\u53f0\u670d\u52a1\u5668\u4e0a\uff0c\u5df2\u7ecf\u542f\u52a8\u4e8680\u7aef\u53e3\u7684nginx\u8fdb\u7a0b\uff0c\u4f46\u662f\u6267\u884c\u201clsof \uff0di:80\u201d\u6216\u8005\\&#8221;ps -ef\\&#8221;\u547d\u4ee4\u540e\uff0c\u6ca1\u6709\u4efb\u4f55\u4fe1\u606f\u8f93\u51fa\uff01\u8fd9\u662f\u4e3a\u4ec0\u4e48\uff1f \u6000\u7591\u673a\u5668\u4e0a\u7684ps\u547d\u4ee4\u88ab\u4eba\u9ed1\u4e86\uff01\u6267\u884c\uff1a<br \/>\n[root@locahost ~]# which ps<br \/>\n\/bin\/ps<br \/>\n[root@locahost ~]# ls -l \/bin\/ps<br \/>\n-rwxr-xr-x. 1 root root 85304 5\u6708 11 2016 \/bin\/ps<br \/>\n[root@locahost ~]# stat \/bin\/ps<br \/>\nFile: \\&#8221;\/bin\/ps\\&#8221;<br \/>\nSize: 85304 Blocks: 168 IO Block: 4096 \u666e\u901a\u6587\u4ef6<br \/>\nDevice: fc02h\/64514d Inode: 13549 Links: 1<br \/>\nAccess: (0755\/-rwxr-xr-x) Uid: ( 0\/ root) Gid: ( 0\/ root)<br \/>\nAccess: 2017-05-07 17:14:37.862999884 +0800<br \/>\nModify: 2016-05-11 07:23:09.000000000 +0800<br \/>\nChange: 2017-05-07 17:14:37.146999967 +0800<br \/>\n\u53d1\u73b0ps\u547d\u4ee4\u7684\u4e8c\u8fdb\u5236\u6587\u4ef6\u679c\u7136\u5728\u8fd1\u671f\u88ab\u6539\u52a8\u8fc7\u3002<br \/>\n\u89e3\u51b3\u529e\u6cd5\uff1a\u53ef\u4ee5\u62f7\u8d1d\u522b\u7684\u673a\u5668\u4e0a\u7684\/bin\/ps\u4e8c\u8fdb\u5236\u6587\u4ef6\u8986\u76d6\u672c\u673a\u7684\u8fd9\u4e2a\u6587\u4ef6\u3002<br \/>\n&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-\u8bb0\u4e00\u6b21Linux\u64cd\u4f5c\u7cfb\u7edf\u88ab\u5165\u4fb5\u7684\u6392\u67e5\u8fc7\u7a0b&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;<br \/>\n\u67d0\u5929\u7a81\u7136\u53d1\u73b0IDC\u673a\u623f\u4e00\u53f0\u6d4b\u8bd5\u670d\u52a1\u5668\u7684\u6d41\u91cf\u5f02\u5e38\uff0c\u51e0\u4e4e\u5360\u6ee1\u4e86\u673a\u623f\u7684\u603b\u5e26\u5bbd\uff0c\u5bfc\u81f4\u5176\u4ed6\u670d\u52a1\u5668\u7a0b\u5e8f\u8fd0\u884c\u4e1a\u52a1\u53d7\u963b\uff01<br \/>\n\u610f\u8bc6\u5230\u4e86\u8fd9\u53f0\u6d4b\u8bd5\u673a\u88ab\u4eba\u79cd\u4e86\u6728\u9a6c\uff0c\u4e8e\u662f\u5f00\u59cb\u4e86\u7d27\u5f20\u7684\u6392\u67e5\u8fc7\u7a0b\uff1a<br \/>\n1\uff09\u8fd0\u884cps\u548ctop\u547d\u4ee4<br \/>\n\u53d1\u73b0\u4e86\u4e24\u4e2a\u964c\u751f\u540d\u79f0\u7684\u7a0b\u5e8f\uff08\u6bd4\u5982mei34hu\uff09\u5360\u7528\u4e86\u5927\u90e8\u5206CPU\u8d44\u6e90\uff0c\u663e\u7136\u8fd9\u662f\u522b\u4eba\u690d\u5165\u7684\u7a0b\u5e8f\uff01<br \/>\n\u679c\u65ad\u5c1d\u8bd5kill\u6389\u8fd9\u4e24\u4e2a\u8fdb\u7a0b\uff0ckill\u540e\uff0c\u6d4b\u8bd5\u673a\u6d41\u91cf\u660e\u663e\u964d\u4e0b\u53bb\u3002\u7136\u800c\u4e0d\u5e78\u7684\u662f\uff0c\u4e0d\u4e00\u4f1a\u513f\u53c8\u6062\u590d\u4e86\u4e4b\u524d\u7684\u72b6\u6001\u3002<br \/>\n2\uff09\u5c06IDC\u8fd9\u53f0\u6d4b\u8bd5\u673a\u7684\u5916\u7f51\u5173\u95ed\u3002\u8fdc\u7a0b\u901a\u8fc7\u8df3\u677f\u673a\u5185\u7f51\u767b\u9646\u8fd9\u53f0\u673a\u5668\u3002<br \/>\n3\uff09\u67e5\u770b\u8fd9\u4e9b\u964c\u751f\u7a0b\u5e8f\u6240\u5728\u8def\u5f84<br \/>\n\u67e5\u627e\u7a0b\u5e8f\u8def\u5f84\uff1a<br \/>\nls \/proc\/\u8fdb\u7a0b\u53f7\/exe\uff0c\u7136\u540e\u518d\u6b21kill\u6389\u8fdb\u7a0b\uff0c\u53c8\u4f1a\u751f\u6210\u4e00\u4e2a\u65b0\u7684\u8fdb\u7a0b\u540d\uff0c\u53d1\u73b0\u8def\u5f84\u4e5f\u662f\u968f\u673a\u5728PATH\u53d8\u91cf\u7684\u8def\u5f84\u4e2d\u53d8\u6362\uff0c\u6709\u65f6\u5728\/bin\u76ee\u5f55\uff0c\u6709\u65f6\u5728\/sbin\uff0c\u6709\u65f6\u5728\/usr\/bin\u76ee\u5f55\u4e2d\u3002<br \/>\n\u770b\u6765\u8fd8\u6709\u540e\u53f0\u4e3b\u63a7\u7a0b\u5e8f\u5728\u4f5c\u602a\uff0c\u7ee7\u7eed\u67e5\u627e\u3002<br \/>\n4\uff09\u5c1d\u8bd5\u67e5\u627e\u8ddf\u8e2a\u7a0b\u5e8f<br \/>\n\u67e5\u770b\/bin\uff0c\/sbin\uff0c\/usr\/bin\u7b49\u76ee\u5f55\u4e0b\u662f\u5426\u5b58\u5728\u4ee5.\u5f00\u5934\u7684\u6587\u4ef6\u540d\uff0c\u53d1\u73b0\u4e0d\u5c11\uff0c\u800c\u4e14\u90e8\u5206\u7a0b\u5e8f\u79fb\u9664\u540e\u4f1a\u81ea\u52a8\u751f\u6210\u3002<br \/>\n[root@localhost ~]# ls \/usr\/bin\/. \/\/\u6309Tab\u952e\u8865\u5168<br \/>\n.\/ ..\/ .ssh.hmac<br \/>\n\u8fd9\u8bf4\u660e\u8fd8\u6ca1\u627e\u5230\u4e3b\u63a7\u7a0b\u5e8f\u3002<br \/>\n5\uff09\u63a5\u7740\u7528strace\u547d\u4ee4\u8ddf\u8e2a\u8fd9\u4e9b\u964c\u751f\u7a0b\u5e8f\uff1a<br \/>\n[root@localhost ~]# strace \/bin\/mei34hu<br \/>\n\u7ed3\u679c\u53d1\u73b0\u5728\u8ddf\u8e2a\u4e86\u8fd9\u4e2a\u7a0b\u5e8f\u540e\uff0c\u5b83\u5c45\u7136\u81ea\u6740\u4e86\uff08\u628a\u81ea\u5df1\u8fdb\u7a0b\u6587\u4ef6\u5e72\u6389\u4e86)\uff01\u7136\u540e\u60f3\u7528netstat\u770b\u4e0b\u7f51\u7edc\u8fde\u63a5\u60c5\u51b5\uff0c\u7ed3\u679c\u5c45\u7136\u67e5\u4e0d\u5230\u4efb\u4f55\u5bf9\u5916\u7684\u7f51\u7edc\u8fde\u63a5\uff0c\u4e8e\u662f\u5f00\u59cb\u6000\u7591\u547d\u4ee4\u88ab\u4fee\u6539\u8fc7\u4e86\u3002<br \/>\n\u4f7f\u7528stat \u67e5\u770b\u7cfb\u7edf\u547d\u4ee4ps\u3001ls \u3001netstat\u3001pstree\u7b49\u7b49\uff1a<br \/>\n[root@localhost ~]# which ps<br \/>\n\/usr\/bin\/ps<br \/>\n[root@localhost ~]# which ls<br \/>\nalias ls=\\&#8217;ls &#8211;color=auto\\&#8217;<br \/>\n\/usr\/bin\/ls<br \/>\n[root@localhost ~]# which netstat<br \/>\n\/usr\/bin\/netstat<br \/>\n[root@localhost ~]# stat \/usr\/bin\/netstat<br \/>\n[root@localhost ~]# stat \/usr\/bin\/ps<br \/>\n[root@localhost ~]# stat \/usr\/bin\/ls<br \/>\n&#8230;&#8230;<br \/>\n\u53d1\u73b0\u4fee\u6539\u65f6\u95f4\u90fd\u662f\u5728\u6700\u8fd1\u76843\u5929\u5185\uff0c\u8fd9\u8ba9\u6211\u731b\u7136\u60f3\u8d77\u4f20\u8bf4\u4e2d\u7684rootkit\u7528\u6237\u6001\u7ea7\u75c5\u6bd2\uff01\uff01<br \/>\n\u6709\u53ef\u80fd\u662f\u8fd9\u53f0\u6d4b\u8bd5\u673a\u521a\u5b89\u88c5\u597d\u7cfb\u7edf\u540e\uff0c\u8bbe\u7f6e\u4e86root\u5bc6\u7801\u4e3a123456\uff0c\u4e4b\u540e\u53c8\u628a\u5b83\u653e\u5230\u8fc7\u516c\u7f51\u4e0a\u88ab\u4eba\u5165\u4fb5\u4e86\u3002<br \/>\n\u63a5\u7740\u67e5\u4e00\u4e0b\u5b83\u5728\u76f8\u5173\u8def\u5f84\u4e2d\u8fd8\u653e\u4e86\u54ea\u4e9b\u7a0b\u5e8f\uff1a<br \/>\n[root@localhost ~]# find \/bin -mtime -3 -type f | xargs rm -f<br \/>\n[root@localhost ~]# find \/usr\/bin -mtime -3 -type f | xargs rm -f<br \/>\n[root@localhost ~]# find \/use\/sbin -mtime -3 -type f | xargs rm -f<br \/>\n[root@localhost ~]# find \/sbin -mtime -3 -type f | xargs rm -f<br \/>\n\u5c06\u4e0a\u9762\u67e5\u627e\u51fa\u76843\u5929\u524d\u7684\u7a0b\u5e8f\u7edf\u7edf\u90fd\u5220\u6389\uff0c\u5e76\u5f3a\u5236\u65ad\u7535\uff0c\u91cd\u542f\u670d\u52a1\u5668\uff01\u7136\u800c\u53ef\u6068\u7684\u662f\u8fd9\u4e9b\u7a0b\u5e8f\u5728\u673a\u5668\u91cd\u542f\u540e\u53c8\u597d\u7aef\u7aef\u7684\u8fd0\u884c\u4ee5\u6765\uff01<br \/>\n\u5f88\u660e\u663e\uff0c\u8fd9\u4e9b\u7a0b\u5e8f\u90fd\u88ab\u8bbe\u7f6e\u4e86\u5f00\u673a\u81ea\u542f\u52a8<br \/>\n6\uff09\u67e5\u770b\u7cfb\u7edf\u542f\u52a8\u9879<br \/>\n[root@localhost ~]# find \/etc\/rc.d\/ -mtime -3 ! -type d<br \/>\n\u679c\u7136\u8fd9\u4e9b\u7a0b\u5e8f\u90fd\u88ab\u8bbe\u7f6e\u4e86\u5f00\u673a\u81ea\u542f\u52a8\u3002\u4e8e\u662f\uff0c\u5c31\u518d\u6765\u4e00\u6b21\u5220\u9664\uff0c\u7136\u540e\u66b4\u529b\u91cd\u542f\u670d\u52a1\u5668\u3002<br \/>\n[root@localhost ~]# find \/bin -mtime -3 -type f | xargs rm -f<br \/>\n[root@localhost ~]# find \/usr\/bin -mtime -3 -type f | xargs rm -f<br \/>\n[root@localhost ~]# find \/use\/sbin -mtime -3 -type f | xargs rm -f<br \/>\n[root@localhost ~]# find \/sbin -mtime -3 -type f | xargs rm -f<br \/>\n[root@localhost ~]# find \/etc\/rc.d\/ -mtime -3 ! -type d | xargs rm -f<br \/>\n\u91cd\u542f\u5b8c\u670d\u52a1\u5668\u540e\uff0c\u7528top\u547d\u4ee4\u67e5\u770b\uff0c\u7cfb\u7edfCPU\u4f7f\u7528\u7387\u4e5f\u4e0d\u9ad8\u4e86\u3002\u5c45\u7136\u8fd9\u6837\u5c31\u88ab\u5e72\u6389\u4e86\u3002<br \/>\n7\uff09\u987e\u8651\u5230\u7cfb\u7edf\u5e38\u7528\u547d\u4ee4\u4e2d\uff08\u5982ls\uff0cps\u7b49\uff09\u53ef\u80fd\u4f1a\u9690\u85cf\u542f\u52a8\u8fdb\u7a0b\uff0c\u8fd9\u6837\u4e00\u65e6\u6267\u884c\u53c8\u4f1a\u62c9\u8d77\u6728\u9a6c\u7a0b\u5e8f\u3002\u4e8e\u662f\u518d\u67e5\u770b\u4e0b\u7cfb\u7edf\u4e2d\u662f\u5426\u521b\u5efa\u4e86\u9664root\u4ee5\u5916\u7684\u7ba1\u7406\u5458\u8d26\u53f7\uff1a<br \/>\n[root@localhost ~]# awk -F\\&#8221;:\\&#8221; \\'{if($3 == 0) print $1}\\&#8217; \/etc\/passwd<br \/>\nroot<br \/>\n\u7ed3\u679c\u53d1\u73b0\u53ea\u8f93\u5165\u4e86root\u8fd9\u4e00\u4e2a\u7528\u6237\uff0c\u8bf4\u660e\u7cfb\u7edf\u7528\u6237\u662f\u6b63\u5e38\u7684\u3002<br \/>\n\u5176\u5b9e\uff0c\u5f53\u7cfb\u7edf\u88ab\u611f\u67d3rootkit\u540e\uff0c\u7cfb\u7edf\u5df2\u7ecf\u53d8\u5f97\u4e0d\u53ef\u9760\u4e86\uff0c\u552f\u4e00\u7684\u529e\u6cd5\u5c31\u662f\u91cd\u88c5\u7cfb\u7edf\u4e86\u3002<br \/>\n8\uff09\u5bf9\u4e8e\u4e00\u4e9b\u5e38\u7528\u547d\u4ee4\u7a0b\u5e8f\u7684\u4fee\u590d\u601d\u8def\uff1a\u627e\u51fa\u5e38\u7528\u547d\u4ee4\u6240\u5728\u7684rpm\u5305\uff0c\u7136\u540e\u5f3a\u5236\u5220\u9664\uff0c\u6700\u540e\u5728\u901a\u8fc7yum\u5b89\u88c5\uff08\u7531\u4e8e\u5916\u7f51\u5df2\u62ff\u6389\uff0c\u53ef\u4ee5\u901a\u8fc7squid\u4ee3\u7406\u4e0a\u7f51\u7684yum\u4e0b\u8f7d\uff09<br \/>\n[root@localhost ~]# rpm -qf \/bin\/ps<br \/>\n[root@localhost ~]# rpm -qf \/bin\/ls<br \/>\n[root@localhost ~]# rpm -qf \/bin\/netstat<br \/>\n[root@localhost ~]# rpm -qf \/usr\/bin\/pstree<br \/>\n\u7136\u540e\u5c06\u4e0a\u9762\u547d\u4ee4\u67e5\u627e\u51fa\u6765\u7684rpm\u5305\u5f3a\u5236\u5378\u8f7d<br \/>\n[root@localhost ~]# rpm -e &#8211;nodeps &#8230;&#8230;<br \/>\n[root@localhost ~]# rpm -e &#8211;nodeps &#8230;&#8230;<br \/>\n[root@localhost ~]# rpm -e &#8211;nodeps &#8230;&#8230;<br \/>\n[root@localhost ~]# rpm -e &#8211;nodeps &#8230;&#8230;<br \/>\n\u63a5\u7740\u518d\u91cd\u65b0\u5b89\u88c5<br \/>\n[root@localhost ~]# yum install -y procps coreutils net-tools psmisc<br \/>\n\u6700\u540e\u91cd\u542f\u4e0b\u7cfb\u7edf\u5373\u53ef\u3002\u9664\u4e86\u4e0a\u9762\u8fd9\u6b21\u6392\u67e5\u4e4b\u5916\uff0c\u8fd8\u53ef\u4ee5\uff1a<br \/>\n1\uff09\u7ed3\u5408\u670d\u52a1\u5668\u7684\u7cfb\u7edf\u65e5\u5fd7\/var\/log\/messages\u3001\/var\/log\/secure\u8fdb\u884c\u4ed4\u7ec6\u68c0\u67e5\u3002<br \/>\n2\uff09\u5c06\u53ef\u7591\u6587\u4ef6\u8bbe\u4e3a\u4e0d\u53ef\u6267\u884c\uff0c\u7528chattr +ai\u5c06\u51e0\u4e2a\u91cd\u8981\u76ee\u5f55\u6539\u4e3a\u4e0d\u53ef\u6dfb\u52a0\u548c\u4fee\u6539\uff0c\u518d\u5c06\u8fdb\u7a0b\u6740\u4e86\uff0c\u518d\u91cd\u542f<br \/>\n3\uff09chkrootkit\u4e4b\u7c7b\u7684\u5de5\u5177\u67e5\u4e00\u4e0b<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u65e5\u5e38\u7e41\u7410\u7684\u8fd0\u7ef4\u5de5\u4f5c\u4e2d\uff0c\u5bf9linux\u670d\u52a1\u5668\u8fdb\u884c\u5b89\u5168\u68c0\u67e5\u662f\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u73af\u8282\u3002\u5982\u4f55\u68c0\u67e5linux\u7cfb\u7edf\u662f\u5426\u906d\u53d7\u4e86\u5165 &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"http:\/\/www.weijing.co\/?p=2203\"> <span class=\"screen-reader-text\">linux\u7cfb\u7edf\u5165\u4fb5\u68c0\u6d4b<\/span> \u67e5\u770b\u5168\u6587 &raquo;<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"categories":[102,124],"tags":[],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"mailpoet_newsletter_max":false,"woocommerce_thumbnail":false,"woocommerce_single":false,"woocommerce_gallery_thumbnail":false,"shop_catalog":false,"shop_single":false,"shop_thumbnail":false},"uagb_author_info":{"display_name":"weijing","author_link":"http:\/\/www.weijing.co\/?author=4"},"uagb_comment_info":0,"uagb_excerpt":"\u5728\u65e5\u5e38\u7e41\u7410\u7684\u8fd0\u7ef4\u5de5\u4f5c\u4e2d\uff0c\u5bf9linux\u670d\u52a1\u5668\u8fdb\u884c\u5b89\u5168\u68c0\u67e5\u662f\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u73af\u8282\u3002\u5982\u4f55\u68c0\u67e5linux\u7cfb\u7edf\u662f\u5426\u906d\u53d7\u4e86\u5165&hellip;","_links":{"self":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/2203"}],"collection":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2203"}],"version-history":[{"count":0,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/2203\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2203"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2203"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2203"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}