Aug  3 12:20:51 *** sshd[7743]: User root from 94.191.107.157 not allowed because not listed in AllowUsers

16008/tcp 7443/tcp 445/tcp...
[2020-06-25/08-03]18pkt,18pt.(tcp)

villaromeo.de 51.140.36.156 [03/Aug/2020:15:25:24 +0200] "POST /xmlrpc.php HTTP/1.1" 200 578 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36"
villaromeo.de 51.140.36.156 [03/Aug/2020:15:25:24 +0200] "POST /xmlrpc.php HTTP/1.1" 200 578 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36"

2020-08-04T01:31:13.204636hostname sshd[86216]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=83.24.32.62.ipv4.supernova.orange.pl  user=root
2020-08-04T01:31:15.182849hostname sshd[86216]: Failed password for root from 83.24.32.62 port 46766 ssh2
...

2020-08-03T13:28:00.459209hostname sshd[68340]: Failed password for root from 178.62.187.136 port 59882 ssh2
...

firewall-block, port(s): 445/tcp

(imapd) Failed IMAP login from 202.72.243.198 (MN/Mongolia/-): 1 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_TRIGGER; Logs: Aug  3 18:44:24 ir1 dovecot[3110802]: imap-login: Disconnected (auth failed, 1 attempts in 5 secs): user=, method=PLAIN, rip=202.72.243.198, lip=5.63.12.44, TLS, session=

154.113.1.142 (NG/Nigeria/-), 12 distributed sshd attacks on account [root] in the last 3600 secs

Lines containing failures of 20.44.229.142
Aug  3 00:42:21 nexus sshd[30925]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=20.44.229.142  user=r.r
Aug  3 00:42:23 nexus sshd[30925]: Failed password for r.r from 20.44.229.142 port 49328 ssh2
Aug  3 00:42:25 nexus sshd[30925]: Received disconnect from 20.44.229.142 port 49328:11: Bye Bye [preauth]
Aug  3 00:42:25 nexus sshd[30925]: Disconnected from 20.44.229.142 port 49328 [preauth]
Aug  3 01:03:03 nexus sshd[31321]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=20.44.229.142  user=r.r
Aug  3 01:03:04 nexus sshd[31321]: Failed password for r.r from 20.44.229.142 port 43480 ssh2
Aug  3 01:03:04 nexus sshd[31321]: Received disconnect from 20.44.229.142 port 43480:11: Bye Bye [preauth]
Aug  3 01:03:04 nexus sshd[31321]: Disconnected from 20.44.229.142 port 43480 [preauth]
Aug  3 01:17:59 nexus sshd[31581]: pam_unix(sshd:auth): authentication........
------------------------------

Aug  3 14:20:37 debian-2gb-nbg1-2 kernel: \[18715708.698407\] \[UFW BLOCK\] IN=eth0 OUT= MAC=96:00:00:0e:18:f4:d2:74:7f:6e:37:e3:08:00 SRC=134.209.102.130 DST=195.201.40.59 LEN=40 TOS=0x00 PREC=0x40 TTL=242 ID=14318 PROTO=TCP SPT=57050 DPT=7203 WINDOW=1024 RES=0x00 SYN URGP=0

Referer Spam

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2020-08-03T17:15:37.341500hostname sshd[71055]: Failed password for root from 118.70.233.163 port 51872 ssh2
...

2020-08-03T12:16:11.486129abusebot-6.cloudsearch.cf sshd[7799]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=115.124.72.81  user=root
2020-08-03T12:16:13.640919abusebot-6.cloudsearch.cf sshd[7799]: Failed password for root from 115.124.72.81 port 46030 ssh2
2020-08-03T12:17:21.199216abusebot-6.cloudsearch.cf sshd[7819]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=115.124.72.81  user=root
2020-08-03T12:17:23.630069abusebot-6.cloudsearch.cf sshd[7819]: Failed password for root from 115.124.72.81 port 56572 ssh2
2020-08-03T12:18:25.178298abusebot-6.cloudsearch.cf sshd[7827]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=115.124.72.81  user=root
2020-08-03T12:18:27.729365abusebot-6.cloudsearch.cf sshd[7827]: Failed password for root from 115.124.72.81 port 38884 ssh2
2020-08-03T12:20:37.346461abusebot-6.cloudsearch.cf sshd[7857]: pam_unix(sshd:auth): authenticati
...

Brute-Force reported by Fail2Ban