1.检查
查看定时任务文件发现有两个异常定时任务
[root@manage ~]# cat /etc/crontab
# * * * * * user-name command to be executed
#*/1 * * * * root /etc/cron.hourly/ssh_deny.sh
#*/3 * * * * root /etc/cron.hourly/gcc4.sh
注释掉定时任务
通过top命令查看会有随机字符串的进程，杀掉进程后又会起来另外一个随机字符串的进程，字符串长度10
2.安装clamav扫描并删除感染文件
yum install -y epel-release
yum install clamav-server clamav-data clamav-update clamav-filesystem clamav clamav-scanner-systemd clamav-devel clamav-lib clamav-server-systemd -y
freshclam #更新数据库
clamscan -r / --max-dir-recursion=5 -l /root/clamav.log #扫描目录
rm -rf `cat clamav.log | grep FOUND | awk -F':' '{print $1}' ` # 删除感染的文件
3.应用被破坏，删除感染文件后重新安装应用
yum -y reinstall procps lsof iproute net-tools psmisc
4.查看进程树，红色为之前杀掉进程后新生成的进程
[root@manage ~]# pstree
systemd─┬─.sshd───{.sshd}
├─qhhpivnzdw───3*[{qhhpivnzdw}]
├─rsyslogd───2*[{rsyslogd}]
├─sshd─┬─sshd───bash───pstree
│ └─sshd───bash
5.查找文件位置，进程号
[root@manage ~]# find / -name qhhpivnzdw
/etc/rc.d/init.d/qhhpivnzdw
/tmp/qhhpivnzdw
[root@manage ~]# pidof /tmp/qhhpivnzdw
7560
6.从定时任务中查看定时脚本内容，破坏病毒文件
[root@manage ~]# cat /etc/cron.hourly/gcc4.sh #路径在定时任务文件中
#!/bin/sh
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/usr/X11R6/bin
cp /lib/libudev4.so /lib/libudev4.so.6
/lib/libudev4.so.6
[root@manage ~]# echo aa> /lib/libudev4.so #破坏文件
[root@manage ~]# rm /lib/libudev4.so.6 #删除拷贝文件
7.删除开机启动项
[root@manage ~]# chkconfig --list | grep on
Note: This output shows SysV services only and does not include native
systemd services. SysV configuration data might be overridden by native
systemd configuration.
If you want to list systemd services use 'systemctl list-unit-files'.
To see services enabled on particular target use
'systemctl list-dependencies [target]'.
gijhcyyfle 0:off 1:on 2:on 3:on 4:on 5:on 6:off
netconsole 0:off 1:off 2:off 3:off 4:off 5:off 6:off
network 0:off 1:off 2:on 3:on 4:on 5:on 6:off
qhhpivnzdw 0:off 1:on 2:on 3:on 4:on 5:on 6:off
tmsppnlzmg 0:off 1:on 2:on 3:on 4:on 5:on 6:off
vimzhvunzi (deleted) 0:off 1:on 2:on 3:on 4:on 5:on 6:off
[root@manage ~]# chkconfig --del gijhcyyfle
[root@manage ~]# chkconfig --del qhhpivnzdw
[root@manage ~]# chkconfig --del tmsppnlzmg
8.杀掉进程，这时候没有其他随机字符串进程起来了
[root@manage ~]# kill -9 7560