在安裝CentOS-6.9-x86_64-minimal.iso之后因?yàn)樵O(shè)置用戶密碼比較簡單,并且沒有修改默認(rèn)的22遠(yuǎn)程端口,導(dǎo)致短時(shí)間被掃描入侵,然后服務(wù)器瘋狂向外發(fā)包,因此被自己搞死過好幾次別人的機(jī)房部分網(wǎng)絡(luò),當(dāng)時(shí)我并未注意,還認(rèn)為是獲取的鏡像源有問題,所以封鎖向外發(fā)包就沒事了,不過過了很久之后我發(fā)現(xiàn)服務(wù)器CPU一直100%但是并無異常,不過TOP查看進(jìn)程后看到一個(gè)進(jìn)程非常奇怪,是一個(gè)隨機(jī)的10位字母進(jìn)程,這就引起了我的注意,于是開始漫長折騰之路...
[root@cloud cron.hourly]# top top - 00:35:21 up 10 min, 1 user, load average: 2.68, 2.18, 1.19 Tasks: 484 total, 1 running, 483 sleeping, 0 stopped, 0 zombie Cpu(s): 5.6%us, 3.1%sy, 0.0%ni, 90.8%id, 0.4%wa, 0.0%hi, 0.1%si, 0.0%st Mem: 8026932k total, 1084296k used, 6942636k free, 80368k buffers Swap: 8388604k total, 0k used, 8388604k free, 282692k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 2918 root 20 0 32664 580 200 S 136.3 0.0 10:37.95 LWnS6b6qrw 1743 root 20 0 66236 1200 484 S 5.5 0.0 0:40.08 sshd 74026 root 20 0 15288 1520 892 R 5.5 0.0 0:00.06 top 1644 root 16 -4 93132 872 608 S 3.7 0.0 0:18.06 auditd 1666 root 20 0 246m 8632 1116 S 1.8 0.1 0:16.20 rsyslogd ...
[root@cloud ~]# cat /etc/rc.d/init.d/LWnS6b6qrw #!/bin/sh # chkconfig: 12345 90 90 # description: LWnS6b6qrw ### BEGIN INIT INFO # Provides: LWnS6b6qrw # Required-Start: # Required-Stop: # Default-Start: 1 2 3 4 5 # Default-Stop: # Short-Description: LWnS6b6qrw ### END INIT INFO case $1 in start) /usr/bin/LWnS6b6qrw ;; stop) ;; *) /usr/bin/LWnS6b6qrw ;; esac
[root@cloud init.d]# cd /etc/rc.d/rc1.d/
[root@cloud rc3.d]# ll
total 0
lrwxrwxrwx. 1 root root 19 Nov 20 2016 K10saslauthd -> ../init.d/saslauthd
lrwxrwxrwx. 1 root root 18 Nov 23 2016 K15svnserve -> ../init.d/svnserve
lrwxrwxrwx. 1 root root 20 Nov 20 2016 K87multipathd -> ../init.d/multipathd
lrwxrwxrwx. 1 root root 21 Nov 20 2016 K87restorecond -> ../init.d/restorecond
lrwxrwxrwx. 1 root root 20 Nov 20 2016 K89netconsole -> ../init.d/netconsole
lrwxrwxrwx. 1 root root 15 Nov 20 2016 K89rdisc -> ../init.d/rdisc
lrwxrwxrwx. 1 root root 22 Nov 20 2016 S02lvm2-monitor -> ../init.d/lvm2-monitor
lrwxrwxrwx. 1 root root 16 Nov 20 2016 S07iscsid -> ../init.d/iscsid
lrwxrwxrwx. 1 root root 19 Nov 20 2016 S08ip6tables -> ../init.d/ip6tables
lrwxrwxrwx. 1 root root 18 Nov 20 2016 S08iptables -> ../init.d/iptables
lrwxrwxrwx. 1 root root 17 Nov 20 2016 S10network -> ../init.d/network
lrwxrwxrwx. 1 root root 16 Nov 20 2016 S11auditd -> ../init.d/auditd
lrwxrwxrwx. 1 root root 17 Nov 20 2016 S12rsyslog -> ../init.d/rsyslog
lrwxrwxrwx. 1 root root 15 Nov 20 2016 S13iscsi -> ../init.d/iscsi
lrwxrwxrwx. 1 root root 19 Nov 20 2016 S15mdmonitor -> ../init.d/mdmonitor
lrwxrwxrwx. 1 root root 26 Nov 20 2016 S25blk-availability -> ../init.d/blk-availability
lrwxrwxrwx. 1 root root 15 Nov 20 2016 S25netfs -> ../init.d/netfs
lrwxrwxrwx. 1 root root 19 Nov 20 2016 S26udev-post -> ../init.d/udev-post
lrwxrwxrwx. 1 root root 19 Nov 23 2016 S50php56-fpm -> ../init.d/php56-fpm
lrwxrwxrwx. 1 root root 14 Nov 20 2016 S55sshd -> ../init.d/sshd
lrwxrwxrwx. 1 root root 17 Nov 22 2016 S64mariadb -> ../init.d/mariadb
lrwxrwxrwx. 1 root root 17 Nov 20 2016 S80postfix -> ../init.d/postfix
lrwxrwxrwx. 1 root root 15 Nov 23 2016 S85httpd -> ../init.d/httpd
lrwxrwxrwx. 1 root root 15 Nov 20 2016 S90crond -> ../init.d/crond
lrwxrwxrwx. 1 root root 22 Jun 12 00:25 S90LWnS6b6qrw -> /etc/init.d/LWnS6b6qrw
lrwxrwxrwx. 1 root root 11 Nov 20 2016 S99local -> ../rc.local
[root@cloud ~]# cat /etc/crontab
SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
HOME=/
# For details see man 4 crontabs
# Example of job definition:
# .---------------- minute (0 - 59)
# | .------------- hour (0 - 23)
# | | .---------- day of month (1 - 31)
# | | | .------- month (1 - 12) OR jan,feb,mar,apr ...
# | | | | .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# | | | | |
# * * * * * user-name command to be executed
*/3 * * * * root /etc/cron.hourly/gcc.sh
[root@cloud ~]# cat /etc/cron.hourly/gcc.sh #!/bin/sh PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/usr/X11R6/bin for i in `cat /proc/net/dev|grep :|awk -F: {'print $1'}`; do ifconfig $i up& done cp /lib/libudev.so /lib/libudev.so.6 /lib/libudev.so.6
/etc/cron.hourly/gcc.sh
/etc/crontab
/etc/rc.d/init.d/
/etc/rc.d/{init.d,rc{1,2,3,4,5}.d}/
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