Dec  7 13:07:04 server sshd\[29384\]: Invalid user schwoebel from 165.227.104.253
Dec  7 13:07:04 server sshd\[29384\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=165.227.104.253 
Dec  7 13:07:06 server sshd\[29384\]: Failed password for invalid user schwoebel from 165.227.104.253 port 38370 ssh2
Dec  7 13:17:05 server sshd\[32276\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=165.227.104.253  user=mysql
Dec  7 13:17:07 server sshd\[32276\]: Failed password for mysql from 165.227.104.253 port 48267 ssh2
...

2019-12-07T07:26:28.461635MailD postfix/smtpd[14951]: NOQUEUE: reject: RCPT from 50-197-162-169-static.hfc.comcastbusiness.net[50.197.162.169]: 554 5.7.1 Service unavailable; Client host [50.197.162.169] blocked using bl.spamcop.net; Blocked - see https://www.spamcop.net/bl.shtml?50.197.162.169; from= to= proto=ESMTP helo=<50-197-162-169-static.hfc.comcastbusiness.net>
2019-12-07T07:26:28.884812MailD postfix/smtpd[14951]: NOQUEUE: reject: RCPT from 50-197-162-169-static.hfc.comcastbusiness.net[50.197.162.169]: 554 5.7.1 Service unavailable; Client host [50.197.162.169] blocked using bl.spamcop.net; Blocked - see https://www.spamcop.net/bl.shtml?50.197.162.169; from= to= proto=ESMTP helo=<50-197-162-169-static.hfc.comcastbusiness.net>
2019-12-07T07:26:29.283499MailD postfix/smtpd[14951]: NOQUEUE: reject: RCPT from 50-197-162-169-static.hfc.comcastbusiness.net[50.197.162.169]: 554 5.7.1 Ser

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Dec  7 11:47:12 Ubuntu-1404-trusty-64-minimal sshd\[4450\]: Invalid user checchio from 106.12.131.5
Dec  7 11:47:12 Ubuntu-1404-trusty-64-minimal sshd\[4450\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.12.131.5
Dec  7 11:47:14 Ubuntu-1404-trusty-64-minimal sshd\[4450\]: Failed password for invalid user checchio from 106.12.131.5 port 50096 ssh2
Dec  7 11:57:22 Ubuntu-1404-trusty-64-minimal sshd\[9945\]: Invalid user musikbot from 106.12.131.5
Dec  7 11:57:22 Ubuntu-1404-trusty-64-minimal sshd\[9945\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.12.131.5

Dec  7 12:23:07 nextcloud sshd\[28836\]: Invalid user menqiong from 83.103.98.211
Dec  7 12:23:07 nextcloud sshd\[28836\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=83.103.98.211
Dec  7 12:23:09 nextcloud sshd\[28836\]: Failed password for invalid user menqiong from 83.103.98.211 port 3305 ssh2
...

SSH brute-force: detected 33 distinct usernames within a 24-hour window.

Dec  7 11:27:31 MK-Soft-VM6 sshd[16662]: Failed password for root from 116.203.203.73 port 43536 ssh2
...

Brute force attempt

2019-12-07T11:31:45.909936abusebot-8.cloudsearch.cf sshd\[25430\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.175.147  user=root

Dec  7 13:05:54 server sshd\[29085\]: Invalid user temp1 from 209.235.67.49
Dec  7 13:05:54 server sshd\[29085\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=209.235.67.49 
Dec  7 13:05:56 server sshd\[29085\]: Failed password for invalid user temp1 from 209.235.67.49 port 48817 ssh2
Dec  7 13:13:55 server sshd\[31243\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=209.235.67.49  user=root
Dec  7 13:13:57 server sshd\[31243\]: Failed password for root from 209.235.67.49 port 45936 ssh2
...

Dec  7 03:38:05 server sshd\[6474\]: Failed password for invalid user annice from 104.248.26.43 port 36234 ssh2
Dec  7 12:33:34 server sshd\[20509\]: Invalid user zackarylee from 104.248.26.43
Dec  7 12:33:34 server sshd\[20509\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=104.248.26.43 
Dec  7 12:33:36 server sshd\[20509\]: Failed password for invalid user zackarylee from 104.248.26.43 port 51278 ssh2
Dec  7 12:43:44 server sshd\[23190\]: Invalid user denna from 104.248.26.43
Dec  7 12:43:44 server sshd\[23190\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=104.248.26.43 
...

SSH Brute Force, server-1 sshd[20674]: Failed password for bin from 198.100.148.71 port 48354 ssh2

'IP reached maximum auth failures for a one day block'

206.189.90.215 - - \[07/Dec/2019:11:34:18 +0000\] "POST /wp-login.php HTTP/1.1" 200 6393 "-" "Mozilla/5.0 \(X11\; Ubuntu\; Linux x86_64\; rv:62.0\) Gecko/20100101 Firefox/62.0"
206.189.90.215 - - \[07/Dec/2019:11:34:19 +0000\] "POST /xmlrpc.php HTTP/1.1" 200 403 "-" "Mozilla/5.0 \(X11\; Ubuntu\; Linux x86_64\; rv:62.0\) Gecko/20100101 Firefox/62.0"
...

Telnetd brute force attack detected by fail2ban