Dec 23 23:48:52 nextcloud sshd\[618\]: Invalid user webmaster from 49.234.67.23
Dec 23 23:48:52 nextcloud sshd\[618\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.234.67.23
Dec 23 23:48:54 nextcloud sshd\[618\]: Failed password for invalid user webmaster from 49.234.67.23 port 53530 ssh2
...

2019-12-23 16:48:52 H=(95-165-163-188.static.spd-mgts.ru) [95.165.163.188]:38167 I=[192.147.25.65]:25 F= rejected RCPT : RBL: found in thrukfz5b56tq6xao6odgdyjrq.zen.dq.spamhaus.net (127.0.0.3, 127.0.0.4, 127.0.0.11) (https://www.spamhaus.org/sbl/query/SBLCSS)
2019-12-23 16:48:52 H=(95-165-163-188.static.spd-mgts.ru) [95.165.163.188]:38167 I=[192.147.25.65]:25 F= rejected RCPT : RBL: found in thrukfz5b56tq6xao6odgdyjrq.zen.dq.spamhaus.net (127.0.0.3, 127.0.0.4, 127.0.0.11) (https://www.spamhaus.org/sbl/query/SBLCSS)
2019-12-23 16:48:52 H=(95-165-163-188.static.spd-mgts.ru) [95.165.163.188]:38167 I=[192.147.25.65]:25 F= rejected RCPT : RBL: found in thrukfz5b56tq6xao6odgdyjrq.zen.dq.spamhaus.net (127.0.0.3, 127.0.0.4, 127.0.0.11) (https://www.spamhaus.org/sbl/query/SBLCSS)
...

Lines containing failures of 136.32.156.194
Dec 23 23:27:53 shared12 sshd[9280]: Invalid user jilda from 136.32.156.194 port 58242
Dec 23 23:27:53 shared12 sshd[9280]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=136.32.156.194
Dec 23 23:27:54 shared12 sshd[9280]: Failed password for invalid user jilda from 136.32.156.194 port 58242 ssh2
Dec 23 23:27:54 shared12 sshd[9280]: Received disconnect from 136.32.156.194 port 58242:11: Bye Bye [preauth]
Dec 23 23:27:54 shared12 sshd[9280]: Disconnected from invalid user jilda 136.32.156.194 port 58242 [preauth]


........
-----------------------------------------------
https://www.blocklist.de/en/view.html?ip=136.32.156.194

1577141327 - 12/23/2019 23:48:47 Host: 189.222.187.245/189.222.187.245 Port: 445 TCP Blocked

Dec 23 15:54:42 game-panel sshd[27608]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=195.22.240.220
Dec 23 15:54:44 game-panel sshd[27608]: Failed password for invalid user antkowiak from 195.22.240.220 port 52410 ssh2
Dec 23 16:00:53 game-panel sshd[27845]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=195.22.240.220

Fail2Ban Ban Triggered

Dec 23 23:39:22 v22018076622670303 sshd\[11026\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=112.85.42.174  user=root
Dec 23 23:39:23 v22018076622670303 sshd\[11026\]: Failed password for root from 112.85.42.174 port 50307 ssh2
Dec 23 23:39:27 v22018076622670303 sshd\[11026\]: Failed password for root from 112.85.42.174 port 50307 ssh2
...

Mar  5 15:28:49 dillonfme sshd\[25504\]: Invalid user z from 129.107.35.245 port 50494
Mar  5 15:28:49 dillonfme sshd\[25504\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=129.107.35.245
Mar  5 15:28:51 dillonfme sshd\[25504\]: Failed password for invalid user z from 129.107.35.245 port 50494 ssh2
Mar  5 15:33:05 dillonfme sshd\[25697\]: Invalid user a from 129.107.35.245 port 47214
Mar  5 15:33:05 dillonfme sshd\[25697\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=129.107.35.245
...

2019-12-23T22:47:03.243006shield sshd\[22950\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=181.48.225.126  user=root
2019-12-23T22:47:04.944984shield sshd\[22950\]: Failed password for root from 181.48.225.126 port 48256 ssh2
2019-12-23T22:49:10.031830shield sshd\[23144\]: Invalid user kuoliang from 181.48.225.126 port 42590
2019-12-23T22:49:10.036430shield sshd\[23144\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=181.48.225.126
2019-12-23T22:49:11.838873shield sshd\[23144\]: Failed password for invalid user kuoliang from 181.48.225.126 port 42590 ssh2

Unauthorized connection attempt detected from IP address 83.239.188.186 to port 445

port scan and connect, tcp 22 (ssh)

Dec 23 19:53:55 firewall sshd[24627]: Failed password for root from 222.186.173.154 port 6474 ssh2
Dec 23 19:54:07 firewall sshd[24627]: error: maximum authentication attempts exceeded for root from 222.186.173.154 port 6474 ssh2 [preauth]
Dec 23 19:54:07 firewall sshd[24627]: Disconnecting: Too many authentication failures [preauth]
...

Dec 24 00:01:26 legacy sshd[4163]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=137.74.171.160
Dec 24 00:01:29 legacy sshd[4163]: Failed password for invalid user admin from 137.74.171.160 port 39704 ssh2
Dec 24 00:04:40 legacy sshd[4254]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=137.74.171.160
...

Feb 10 16:26:09 dillonfme sshd\[13342\]: Invalid user rp from 128.77.28.199 port 33632
Feb 10 16:26:09 dillonfme sshd\[13342\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=128.77.28.199
Feb 10 16:26:12 dillonfme sshd\[13342\]: Failed password for invalid user rp from 128.77.28.199 port 33632 ssh2
Feb 10 16:31:16 dillonfme sshd\[13498\]: Invalid user steam from 128.77.28.199 port 53114
Feb 10 16:31:16 dillonfme sshd\[13498\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=128.77.28.199
...

Brute-force attempt banned