記一次簡單的linux肉雞檢測 (3)

p
tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN 2883/vsftpd
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 2315/cupsd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 2361/sendmail: acce
tcp 0 0 0.0.0.0:65530 0.0.0.0:* LISTEN 2663/ttyload （有東東出來了吧）
tcp 0 0 127.0.0.1:2207 0.0.0.0:* LISTEN 2303/python
tcp 0 0 :::22 :::* LISTEN 13935/sshd

現在再用chkrootkit和rkhunter查一下看看：

[root@localhost .v]# ls
chkrootkit-0.48 chkrootkit.tar.gz rkhunter rkhunter-1.2.7.tar.gz
[root@localhost .v]# cd chkrootkit-0.48/
[root@localhost chkrootkit-0.48]# ./chkrootkit
ROOTDIR is `/'
Checking `amd'... not found
Checking `basename'... not infected
............（省略若干行）
Checking `ifconfig'... INFECTED
............（省略若干行）
Checking `pstree'... INFECTED
............（省略若干行）
Checking `top'... INFECTED
............（省略若干行）
Searching for t0rn's v8 defaults... Possible t0rn v8 \(or variation\) rootkit installed
............（省略若干行）
Searching for Showtee... Warning: Possible Showtee Rootkit installed
............（省略若干行）
Searching for Romanian rootkit... /usr/include/file.h /usr/include/proc.h
............（省略若干行）

上面幾行都是有問題的。
下面用rkhunter，它的log存在/var/log/rkhunter.log里面

[root@localhost rkhunter]# /usr/local/bin/rkhunter -c --createlogfile

Rootkit Hunter 1.2.7 is running

Determining OS... Unknown
Warning: This operating system is not fully supported!
Warning: Cannot find md5_not_known
All MD5 checks will be skipped! （md5sum被替換了）
............（省略若干行）
Rootkit 'SHV4'... [ Warning! ] （SHV4）

--------------------------------------------------------------------------------
Found parts of this rootkit/trojan by checking the default files and directories
Please inspect the available files, by running this check with the parameter
--createlogfile and check the log file (current file: /var/log/rkhunter.log).
--------------------------------------------------------------------------------

[Press <ENTER> to continue]

Rootkit 'SHV5'... [ Warning! ] （SHV5）

--------------------------------------------------------------------------------
Found parts of this rootkit/trojan by checking the default files and directories
Please inspect the available files, by running this check with the parameter
--createlogfile and check the log file (current file: /var/log/rkhunter.log).
--------------------------------------------------------------------------------
............（省略若干行）
Scanning took 84 seconds
Scan results written to logfile (/var/log/rkhunter.log)

-----------------------------------------------------------------------

Do you have some problems, undetected rootkits, false positives, ideas
or suggestions?
Please e-mail me by filling in the contact form (@http://www.rootkit.nl)

-----------------------------------------------------------------------

下面我們看下log：

[root@localhost rkhunter]# cat /var/log/rkhunter.log
[15:16:51] Running Rootkit Hunter 1.2.7 on localhost.localdomain
[15:16:51]
Rootkit Hunter 1.2.7, Copyright 2003-2005, Michael Boelen
............（省略若干行）
[15:16:55] *** Start scan SHV4 ***
[15:16:55] - File /etc/ld.so.hash... OK. Not found.
[15:16:55] - File /lib/libext-2.so.7... OK. Not found.
[15:16:55] - File /lib/lidps1.so... WARNING! Exists. （找到一個文件）
[15:16:55] - File /usr/sbin/xntps... OK. Not found.
[15:16:55] - Directory /lib/security/.config... OK. Not found.
[15:16:55] - Directory /lib/security/.config/ssh... OK. Not found.
[15:17:04] *** Start scan SHV5 ***
[15:17:04] - File /etc/sh.conf... WARNING! Exists. （找到一個文件）
[15:17:04] - File /dev/srd0... OK. Not found.
[15:17:04] - Directory /usr/lib/libsh... WARNING! Exists. （找到一個目錄）
............（省略若干行）

下面手工核對下，因為工具都是對已有的檢查，如果改過的，他就找不到了。

[root@localhost sbin]# netstat -anp
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:65530 0.0.0.0:* LISTEN 2663/ttyload
............（省略若干行）
raw 0 0 0.0.0.0:1 0.0.0.0:* 7 2679/ttymon
............（省略若干行）

發現2個不正常的
[root@localhost sbin]# ps aux|grep 2663
root 2663 0.0 0.0 2128 516 ? Ss 12:37 0:00 /sbin/ttyload -q （原型出來了）
root 15350 0.0 0.0 4088 604 pts/0 S+ 15:21 0:00 grep 2663
[root@localhost sbin]# lsof -p 2663
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
3 2663 root cwd DIR 253,0 4096 2 /
3 2663 root rtd DIR 253,0 4096 2 /
3 2663 root txt REG 253,0 652620 34897965 /tmp/sh-AQJ3OQYACSO (deleted) （是個壓縮的）
3 2663 root mem REG 253,0 121684 8586729 /lib/ld-2.5

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