Attacked by hackers.

Security Events
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Jul 7 04:10:55 localhost sshd[10430]: Illegal user admin from ::ffff:203.134.243.24
Jul 7 04:11:03 localhost sshd[10434]: Illegal user admin from ::ffff:203.134.243.24
Jul 7 04:11:06 localhost sshd[10436]: Illegal user admin from ::ffff:203.134.243.24
Jul 7 04:11:09 localhost sshd[10438]: Illegal user admin from ::ffff:203.134.243.24
checked with
"whois 203.134.243.24"
It is from Beijing. Turned on firewall and turned off sshd and httpd (use guarddog).