Unauthorized connection attempt detected from IP address 5.89.243.30 to port 23

Jun 18 07:57:08 vps sshd[409155]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=180.76.242.204  user=root
Jun 18 07:57:10 vps sshd[409155]: Failed password for root from 180.76.242.204 port 55860 ssh2
Jun 18 08:01:42 vps sshd[431050]: Invalid user jean from 180.76.242.204 port 50798
Jun 18 08:01:42 vps sshd[431050]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=180.76.242.204
Jun 18 08:01:44 vps sshd[431050]: Failed password for invalid user jean from 180.76.242.204 port 50798 ssh2
...

Lines containing failures of 103.79.52.19
Jun 16 23:32:00 penfold sshd[25997]: Invalid user lzs from 103.79.52.19 port 50464
Jun 16 23:32:00 penfold sshd[25997]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=103.79.52.19 
Jun 16 23:32:03 penfold sshd[25997]: Failed password for invalid user lzs from 103.79.52.19 port 50464 ssh2
Jun 16 23:32:04 penfold sshd[25997]: Received disconnect from 103.79.52.19 port 50464:11: Bye Bye [preauth]
Jun 16 23:32:04 penfold sshd[25997]: Disconnected from invalid user lzs 103.79.52.19 port 50464 [preauth]
Jun 16 23:50:21 penfold sshd[27397]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=103.79.52.19  user=r.r
Jun 16 23:50:23 penfold sshd[27397]: Failed password for r.r from 103.79.52.19 port 48660 ssh2
Jun 16 23:50:24 penfold sshd[27397]: Received disconnect from 103.79.52.19 port 48660:11: Bye Bye [preauth]
Jun 16 23:50:24 penfold sshd[27397]: Disconnecte........
------------------------------

WordPress login Brute force / Web App Attack on client site.

(From blair.major@gmail.com) 
Say no to paying 1000's of dollars for overpriced Google advertising! Let me show you a method that requires only a small payment and delivers an almost endless amount of web visitors to your website

To get more info take a look at: https://bit.ly/adpostingfast

2020-06-18T13:00:36.652668galaxy.wi.uni-potsdam.de sshd[25051]: Failed password for invalid user shahid from 118.27.39.94 port 33462 ssh2
2020-06-18T13:02:14.955920galaxy.wi.uni-potsdam.de sshd[25265]: Invalid user cloud from 118.27.39.94 port 59108
2020-06-18T13:02:14.961188galaxy.wi.uni-potsdam.de sshd[25265]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=v118-27-39-94.al0z.static.cnode.io
2020-06-18T13:02:14.955920galaxy.wi.uni-potsdam.de sshd[25265]: Invalid user cloud from 118.27.39.94 port 59108
2020-06-18T13:02:17.092707galaxy.wi.uni-potsdam.de sshd[25265]: Failed password for invalid user cloud from 118.27.39.94 port 59108 ssh2
2020-06-18T13:03:53.969123galaxy.wi.uni-potsdam.de sshd[25479]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=v118-27-39-94.al0z.static.cnode.io  user=root
2020-06-18T13:03:56.025324galaxy.wi.uni-potsdam.de sshd[25479]: Failed password for root from 118.27.39.94 port 5651
...

Unauthorized connection attempt detected from IP address 192.35.168.194 to port 9419

Brute forcing email accounts

Icarus honeypot on github

Jun 18 07:37:27 ws26vmsma01 sshd[7144]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=173.53.23.48
Jun 18 07:37:29 ws26vmsma01 sshd[7144]: Failed password for invalid user usr01 from 173.53.23.48 port 56400 ssh2
...

port scan and connect, tcp 23 (telnet)

Lines containing failures of 154.92.15.7
Jun 16 23:46:42 neweola sshd[10169]: Invalid user sakura from 154.92.15.7 port 33682
Jun 16 23:46:42 neweola sshd[10169]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=154.92.15.7 
Jun 16 23:46:44 neweola sshd[10169]: Failed password for invalid user sakura from 154.92.15.7 port 33682 ssh2
Jun 16 23:46:44 neweola sshd[10169]: Received disconnect from 154.92.15.7 port 33682:11: Bye Bye [preauth]
Jun 16 23:46:44 neweola sshd[10169]: Disconnected from invalid user sakura 154.92.15.7 port 33682 [preauth]
Jun 17 00:00:28 neweola sshd[10771]: Invalid user odoo from 154.92.15.7 port 46946
Jun 17 00:00:28 neweola sshd[10771]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=154.92.15.7 
Jun 17 00:00:30 neweola sshd[10771]: Failed password for invalid user odoo from 154.92.15.7 port 46946 ssh2
Jun 17 00:00:32 neweola sshd[10771]: Received disconnect from 154.9........
------------------------------

SSH Brute-Force reported by Fail2Ban

(imapd) Failed IMAP login from 5.78.107.11 (IR/Iran/-): 1 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_TRIGGER; Logs: Jun 18 15:14:49 ir1 dovecot[2885757]: imap-login: Aborted login (auth failed, 1 attempts in 2 secs): user=, method=PLAIN, rip=5.78.107.11, lip=5.63.12.44, session=

2020-06-18T10:54:49.679093mail.broermann.family sshd[17054]: Invalid user sinusbot1 from 192.144.132.172 port 32982
2020-06-18T10:54:49.683545mail.broermann.family sshd[17054]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.144.132.172
2020-06-18T10:54:49.679093mail.broermann.family sshd[17054]: Invalid user sinusbot1 from 192.144.132.172 port 32982
2020-06-18T10:54:52.291571mail.broermann.family sshd[17054]: Failed password for invalid user sinusbot1 from 192.144.132.172 port 32982 ssh2
2020-06-18T10:57:31.857571mail.broermann.family sshd[17320]: Invalid user angelo from 192.144.132.172 port 37174
...