2020-06-21T12:32:03.674828ns386461 sshd\[23474\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.173.142  user=root
2020-06-21T12:32:05.833163ns386461 sshd\[23474\]: Failed password for root from 222.186.173.142 port 47984 ssh2
2020-06-21T12:32:08.418383ns386461 sshd\[23474\]: Failed password for root from 222.186.173.142 port 47984 ssh2
2020-06-21T12:32:13.030210ns386461 sshd\[23474\]: Failed password for root from 222.186.173.142 port 47984 ssh2
2020-06-21T12:32:17.326568ns386461 sshd\[23474\]: Failed password for root from 222.186.173.142 port 47984 ssh2
...

RU_ITDELUXE-MNT_<177>1592734482 [1:2402000:5581] ET DROP Dshield Block Listed Source group 1 [Classification: Misc Attack] [Priority: 2]:  {TCP} 92.63.197.58:52089

Jun 21 05:50:17 debian-2gb-nbg1-2 kernel: \[14970099.381015\] \[UFW BLOCK\] IN=eth0 OUT= MAC=96:00:00:0e:18:f4:d2:74:7f:6e:37:e3:08:00 SRC=125.227.102.228 DST=195.201.40.59 LEN=40 TOS=0x00 PREC=0x00 TTL=243 ID=58572 DF PROTO=TCP SPT=54260 DPT=23 WINDOW=14600 RES=0x00 SYN URGP=0

[2020-06-21 07:27:35] NOTICE[1273] chan_sip.c: Registration from '' failed for '104.42.126.249:52773' - Wrong password
[2020-06-21 07:27:35] SECURITY[1288] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-06-21T07:27:35.296-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="1001",SessionID="0x7f31c02f97a8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/104.42.126.249/52773",Challenge="4287faf8",ReceivedChallenge="4287faf8",ReceivedHash="bee9ea31ad79495dc21591c3fb468bc5"
[2020-06-21 07:29:21] NOTICE[1273] chan_sip.c: Registration from '' failed for '104.42.126.249:58206' - Wrong password
[2020-06-21 07:29:21] SECURITY[1288] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-06-21T07:29:21.457-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="1001",SessionID="0x7f31c0045328",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/104.42.126
...

Jun 21 08:08:18 eventyay sshd[32201]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=210.212.237.67
Jun 21 08:08:20 eventyay sshd[32201]: Failed password for invalid user josh from 210.212.237.67 port 60016 ssh2
Jun 21 08:11:43 eventyay sshd[32297]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=210.212.237.67
...

Jun 21 12:37:57 vps sshd[90067]: Failed password for invalid user r from 124.128.158.37 port 10198 ssh2
Jun 21 12:41:10 vps sshd[109106]: Invalid user night from 124.128.158.37 port 10199
Jun 21 12:41:10 vps sshd[109106]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=124.128.158.37
Jun 21 12:41:12 vps sshd[109106]: Failed password for invalid user night from 124.128.158.37 port 10199 ssh2
Jun 21 12:47:44 vps sshd[140385]: Invalid user vlt from 124.128.158.37 port 10201
...

Invalid user gy from 140.143.211.45 port 35442

Jun 21 08:17:42 marvibiene sshd[43879]: Invalid user javier from 165.22.54.171 port 56474
Jun 21 08:17:42 marvibiene sshd[43879]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=165.22.54.171
Jun 21 08:17:42 marvibiene sshd[43879]: Invalid user javier from 165.22.54.171 port 56474
Jun 21 08:17:44 marvibiene sshd[43879]: Failed password for invalid user javier from 165.22.54.171 port 56474 ssh2
...

Jun 21 07:52:40 dev0-dcde-rnet sshd[20061]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=94.199.198.137
Jun 21 07:52:42 dev0-dcde-rnet sshd[20061]: Failed password for invalid user deploy from 94.199.198.137 port 53936 ssh2
Jun 21 07:57:40 dev0-dcde-rnet sshd[20116]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=94.199.198.137

Jun 21 15:51:41 dhoomketu sshd[932492]: Failed password for root from 112.85.42.186 port 43752 ssh2
Jun 21 15:53:07 dhoomketu sshd[932519]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=112.85.42.186  user=root
Jun 21 15:53:09 dhoomketu sshd[932519]: Failed password for root from 112.85.42.186 port 46754 ssh2
Jun 21 15:54:28 dhoomketu sshd[932533]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=112.85.42.186  user=root
Jun 21 15:54:30 dhoomketu sshd[932533]: Failed password for root from 112.85.42.186 port 23391 ssh2
...

Attacks websites by trying to access known vulnerables of plugins, brute-force of backends or probing of administrative tools

2020-06-21T13:10:58.397704vps751288.ovh.net sshd\[5209\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.175.167  user=root
2020-06-21T13:11:01.109141vps751288.ovh.net sshd\[5209\]: Failed password for root from 222.186.175.167 port 63490 ssh2
2020-06-21T13:11:04.298906vps751288.ovh.net sshd\[5209\]: Failed password for root from 222.186.175.167 port 63490 ssh2
2020-06-21T13:11:07.232893vps751288.ovh.net sshd\[5209\]: Failed password for root from 222.186.175.167 port 63490 ssh2
2020-06-21T13:11:10.578348vps751288.ovh.net sshd\[5209\]: Failed password for root from 222.186.175.167 port 63490 ssh2

Jun 21 11:11:23 *** sshd[9733]: User root from 141.98.81.209 not allowed because not listed in AllowUsers

Brute-force attempt banned