Invalid user admin from 106.13.200.50 port 40324

Oct  6 04:00:33 xtremcommunity sshd\[226966\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=112.4.154.134  user=root
Oct  6 04:00:35 xtremcommunity sshd\[226966\]: Failed password for root from 112.4.154.134 port 57249 ssh2
Oct  6 04:04:23 xtremcommunity sshd\[227053\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=112.4.154.134  user=root
Oct  6 04:04:25 xtremcommunity sshd\[227053\]: Failed password for root from 112.4.154.134 port 36321 ssh2
Oct  6 04:08:09 xtremcommunity sshd\[227136\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=112.4.154.134  user=root
...

2019-10-06T08:19:47.652644shield sshd\[14769\]: Invalid user 123 from 38.122.132.178 port 55898
2019-10-06T08:19:47.657168shield sshd\[14769\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=38.122.132.178
2019-10-06T08:19:49.604226shield sshd\[14769\]: Failed password for invalid user 123 from 38.122.132.178 port 55898 ssh2
2019-10-06T08:23:39.349259shield sshd\[15307\]: Invalid user P@SSW0RD_123 from 38.122.132.178 port 39564
2019-10-06T08:23:39.353831shield sshd\[15307\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=38.122.132.178

Oct  5 22:14:27 sachi sshd\[24447\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.225.129.108  user=root
Oct  5 22:14:29 sachi sshd\[24447\]: Failed password for root from 106.225.129.108 port 49575 ssh2
Oct  5 22:19:38 sachi sshd\[24871\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.225.129.108  user=root
Oct  5 22:19:41 sachi sshd\[24871\]: Failed password for root from 106.225.129.108 port 39025 ssh2
Oct  5 22:24:16 sachi sshd\[25272\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.225.129.108  user=root

Triggered by Fail2Ban at Vostok web server

2019-10-05 22:48:50 H=(unassigned.calpop.com) [64.27.10.3]:33614 I=[192.147.25.65]:25 F= rejected RCPT : RBL: found in thrukfz5b56tq6xao6odgdyjrq.zen.dq.spamhaus.net (127.0.0.4, 127.0.0.3) (https://www.spamhaus.org/query/ip/64.27.10.3)
2019-10-05 22:48:50 H=(unassigned.calpop.com) [64.27.10.3]:33614 I=[192.147.25.65]:25 F= rejected RCPT : RBL: found in thrukfz5b56tq6xao6odgdyjrq.zen.dq.spamhaus.net (127.0.0.4, 127.0.0.3) (https://www.spamhaus.org/query/ip/64.27.10.3)
2019-10-05 22:48:50 H=(unassigned.calpop.com) [64.27.10.3]:33614 I=[192.147.25.65]:25 F= rejected RCPT : RBL: found in thrukfz5b56tq6xao6odgdyjrq.zen.dq.spamhaus.net (127.0.0.4, 127.0.0.3) (https://www.spamhaus.org/query/ip/64.27.10.3)
...

Oct  6 04:47:20 work-partkepr sshd\[7116\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=68.183.127.93  user=root
Oct  6 04:47:22 work-partkepr sshd\[7116\]: Failed password for root from 68.183.127.93 port 40218 ssh2
...

Oct  6 07:02:35 MK-Soft-VM4 sshd[25997]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=80.211.113.144 
Oct  6 07:02:38 MK-Soft-VM4 sshd[25997]: Failed password for invalid user Dexter@123 from 80.211.113.144 port 60360 ssh2
...

Oct  6 10:40:24 host sshd\[62781\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.175.163  user=root
Oct  6 10:40:26 host sshd\[62781\]: Failed password for root from 222.186.175.163 port 16848 ssh2
...

Oct  6 07:58:30 mail postfix/smtpd\[27917\]: warning: unknown\[185.36.81.236\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Oct  6 08:53:39 mail postfix/smtpd\[31306\]: warning: unknown\[185.36.81.236\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Oct  6 09:21:01 mail postfix/smtpd\[31816\]: warning: unknown\[185.36.81.236\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Oct  6 09:48:52 mail postfix/smtpd\[32367\]: warning: unknown\[185.36.81.236\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\

$f2bV_matches

$f2bV_matches

Oct  6 08:15:01 sshgateway sshd\[2540\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.173.215  user=root
Oct  6 08:15:04 sshgateway sshd\[2540\]: Failed password for root from 222.186.173.215 port 43524 ssh2
Oct  6 08:15:20 sshgateway sshd\[2540\]: error: maximum authentication attempts exceeded for root from 222.186.173.215 port 43524 ssh2 \[preauth\]

Oct  5 21:26:45 web9 sshd\[17553\]: Invalid user Aero2017 from 103.40.235.215
Oct  5 21:26:45 web9 sshd\[17553\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=103.40.235.215
Oct  5 21:26:47 web9 sshd\[17553\]: Failed password for invalid user Aero2017 from 103.40.235.215 port 60907 ssh2
Oct  5 21:31:15 web9 sshd\[18330\]: Invalid user Heslo_111 from 103.40.235.215
Oct  5 21:31:15 web9 sshd\[18330\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=103.40.235.215

\[2019-10-06 10:25:39\] NOTICE\[603\] res_pjsip/pjsip_distributor.c: Request 'REGISTER' from '\' failed for '185.117.118.187:50519' \(callid: 971452976-2095261587-625083256\) - Failed to authenticate
\[2019-10-06 10:25:39\] SECURITY\[1715\] res_security_log.c: SecurityEvent="ChallengeResponseFailed",EventTV="2019-10-06T10:25:39.334+0200",Severity="Error",Service="PJSIP",EventVersion="1",AccountID="\",SessionID="971452976-2095261587-625083256",LocalAddress="IPV4/UDP/188.40.118.248/5060",RemoteAddress="IPV4/UDP/185.117.118.187/50519",Challenge="1570350339/33f475a0803dc7ac3922c591cf3236e9",Response="745dd15b18afb553b6ba201f8554eaaa",ExpectedResponse=""
\[2019-10-06 10:25:39\] NOTICE\[5713\] res_pjsip/pjsip_distributor.c: Request 'REGISTER' from '\' failed for '185.117.118.187:50519' \(callid: 971452976-2095261587-625083256\) - Failed to authenticate
\[2019-10-06 10:25:39\] SECURITY\[1715\] res_security_log.c: SecurityEvent="ChallengeRespo