Mar  4 08:59:28 silence02 sshd[19490]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=122.114.73.23
Mar  4 08:59:30 silence02 sshd[19490]: Failed password for invalid user n from 122.114.73.23 port 55300 ssh2
Mar  4 09:08:39 silence02 sshd[20054]: Failed password for list from 122.114.73.23 port 57756 ssh2

Mar  4 12:47:34 gw1 sshd[469]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=203.187.186.192
Mar  4 12:47:36 gw1 sshd[469]: Failed password for invalid user mohan from 203.187.186.192 port 52308 ssh2
...

2020-03-04T07:36:28.743650randservbullet-proofcloud-66.localdomain sshd[7498]: Invalid user yyg from 211.193.58.173 port 57816
2020-03-04T07:36:28.753028randservbullet-proofcloud-66.localdomain sshd[7498]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=211.193.58.173
2020-03-04T07:36:28.743650randservbullet-proofcloud-66.localdomain sshd[7498]: Invalid user yyg from 211.193.58.173 port 57816
2020-03-04T07:36:30.181271randservbullet-proofcloud-66.localdomain sshd[7498]: Failed password for invalid user yyg from 211.193.58.173 port 57816 ssh2
...

Postfix RBL failed

[2020-03-04 03:08:50] NOTICE[1148] chan_sip.c: Registration from '' failed for '45.56.137.133:54674' - Wrong password
[2020-03-04 03:08:50] SECURITY[1163] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-03-04T03:08:50.387-0500",Severity="Error",Service="SIP",EventVersion="2",AccountID="5921",SessionID="0x7fd82cb29a68",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/45.56.137.133/54674",Challenge="7edf851c",ReceivedChallenge="7edf851c",ReceivedHash="9da54ec5a3b2a0dbde3ac9db02f95f2d"
[2020-03-04 03:09:24] NOTICE[1148] chan_sip.c: Registration from '' failed for '45.56.137.133:50309' - Wrong password
[2020-03-04 03:09:24] SECURITY[1163] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-03-04T03:09:24.101-0500",Severity="Error",Service="SIP",EventVersion="2",AccountID="2987",SessionID="0x7fd82c144298",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/45.56.137.133
...

Fail2Ban - SSH Bruteforce Attempt

0,81-03/03 [bc02/m44] PostRequest-Spammer scoring: essen

Mar  4 02:56:23 NPSTNNYC01T sshd[4952]: Failed password for root from 222.186.175.151 port 1148 ssh2
Mar  4 02:56:37 NPSTNNYC01T sshd[4952]: Failed password for root from 222.186.175.151 port 1148 ssh2
Mar  4 02:56:37 NPSTNNYC01T sshd[4952]: error: maximum authentication attempts exceeded for root from 222.186.175.151 port 1148 ssh2 [preauth]
...

Unauthorized SSH login attempts

Mar  4 09:03:49 localhost sshd\[15896\]: Invalid user cpanelcabcache from 118.25.18.30 port 42072
Mar  4 09:03:49 localhost sshd\[15896\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=118.25.18.30
Mar  4 09:03:52 localhost sshd\[15896\]: Failed password for invalid user cpanelcabcache from 118.25.18.30 port 42072 ssh2

2020-03-04T06:57:51.760557vps773228.ovh.net sshd[19837]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=ip255.ip-51-75-153.eu
2020-03-04T06:57:51.749295vps773228.ovh.net sshd[19837]: Invalid user oracle from 51.75.153.255 port 45600
2020-03-04T06:57:53.564423vps773228.ovh.net sshd[19837]: Failed password for invalid user oracle from 51.75.153.255 port 45600 ssh2
2020-03-04T08:03:14.008025vps773228.ovh.net sshd[21417]: Invalid user jira from 51.75.153.255 port 43760
2020-03-04T08:03:14.022748vps773228.ovh.net sshd[21417]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=ip255.ip-51-75-153.eu
2020-03-04T08:03:14.008025vps773228.ovh.net sshd[21417]: Invalid user jira from 51.75.153.255 port 43760
2020-03-04T08:03:15.386261vps773228.ovh.net sshd[21417]: Failed password for invalid user jira from 51.75.153.255 port 43760 ssh2
2020-03-04T08:19:45.829085vps773228.ovh.net sshd[21843]: Invalid user news from 51.75.1
...

Mar  4 09:14:10 silence02 sshd[20301]: Failed password for root from 122.51.66.125 port 59086 ssh2
Mar  4 09:23:03 silence02 sshd[20848]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=122.51.66.125
Mar  4 09:23:05 silence02 sshd[20848]: Failed password for invalid user wuwei from 122.51.66.125 port 42904 ssh2

2020-03-04T08:14:53.550034shield sshd\[6221\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=61.177.172.158  user=root
2020-03-04T08:14:55.414591shield sshd\[6221\]: Failed password for root from 61.177.172.158 port 12461 ssh2
2020-03-04T08:14:57.767048shield sshd\[6221\]: Failed password for root from 61.177.172.158 port 12461 ssh2
2020-03-04T08:15:00.771963shield sshd\[6221\]: Failed password for root from 61.177.172.158 port 12461 ssh2
2020-03-04T08:16:42.258964shield sshd\[6477\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=61.177.172.158  user=root

Mar  4 10:26:10 server sshd\[19832\]: Invalid user test from 115.68.184.88
Mar  4 10:26:10 server sshd\[19832\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=115.68.184.88 
Mar  4 10:26:12 server sshd\[19832\]: Failed password for invalid user test from 115.68.184.88 port 35525 ssh2
Mar  4 10:30:14 server sshd\[21062\]: Invalid user oracle from 115.68.184.88
Mar  4 10:30:14 server sshd\[21062\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=115.68.184.88 
...

Mar  4 08:06:51 jane sshd[26563]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.75.168.107 
Mar  4 08:06:53 jane sshd[26563]: Failed password for invalid user zhangdy from 106.75.168.107 port 34776 ssh2
...