Jun  3 06:28:29 roki-contabo sshd\[23560\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=139.199.115.210  user=root
Jun  3 06:28:30 roki-contabo sshd\[23560\]: Failed password for root from 139.199.115.210 port 26968 ssh2
Jun  3 06:47:34 roki-contabo sshd\[23821\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=139.199.115.210  user=root
Jun  3 06:47:36 roki-contabo sshd\[23821\]: Failed password for root from 139.199.115.210 port 21629 ssh2
Jun  3 06:51:58 roki-contabo sshd\[23874\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=139.199.115.210  user=root
...

0,39-01/02 [bc01/m12] PostRequest-Spammer scoring: brussels

Jun  3 07:40:56 server sshd[21406]: Failed none for root from 222.186.175.202 port 43504 ssh2
Jun  3 07:40:59 server sshd[21406]: Failed password for root from 222.186.175.202 port 43504 ssh2
Jun  3 07:41:04 server sshd[21406]: Failed password for root from 222.186.175.202 port 43504 ssh2

Jun  3 07:03:24 localhost sshd\[17109\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.51.163.35  user=root
Jun  3 07:03:25 localhost sshd\[17109\]: Failed password for root from 49.51.163.35 port 56136 ssh2
Jun  3 07:06:43 localhost sshd\[17346\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.51.163.35  user=root
Jun  3 07:06:45 localhost sshd\[17346\]: Failed password for root from 49.51.163.35 port 33324 ssh2
Jun  3 07:10:06 localhost sshd\[17670\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.51.163.35  user=root
...

Jun  3 06:50:06 debian-2gb-nbg1-2 kernel: \[13418570.181756\] \[UFW BLOCK\] IN=eth0 OUT= MAC=96:00:00:0e:18:f4:d2:74:7f:6e:37:e3:08:00 SRC=14.215.177.38 DST=195.201.40.59 LEN=62 TOS=0x00 PREC=0x00 TTL=246 ID=54321 PROTO=UDP SPT=12001 DPT=161 LEN=42

Jun  2 19:05:28 php1 sshd\[25941\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=144.217.83.201  user=root
Jun  2 19:05:30 php1 sshd\[25941\]: Failed password for root from 144.217.83.201 port 58268 ssh2
Jun  2 19:09:06 php1 sshd\[26432\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=144.217.83.201  user=root
Jun  2 19:09:08 php1 sshd\[26432\]: Failed password for root from 144.217.83.201 port 33354 ssh2
Jun  2 19:12:46 php1 sshd\[26716\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=144.217.83.201  user=root

$f2bV_matches

Multiple web server 500 error code (Internal Error).

Port probing on unauthorized port 445

2020-06-03T03:35:04.306066ionos.janbro.de sshd[34468]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=223.171.32.55  user=root
2020-06-03T03:35:06.253072ionos.janbro.de sshd[34468]: Failed password for root from 223.171.32.55 port 59883 ssh2
2020-06-03T03:40:26.741270ionos.janbro.de sshd[34489]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=223.171.32.55  user=root
2020-06-03T03:40:28.557762ionos.janbro.de sshd[34489]: Failed password for root from 223.171.32.55 port 59883 ssh2
2020-06-03T03:46:05.179150ionos.janbro.de sshd[34525]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=223.171.32.55  user=root
2020-06-03T03:46:07.201225ionos.janbro.de sshd[34525]: Failed password for root from 223.171.32.55 port 59883 ssh2
2020-06-03T03:51:19.304495ionos.janbro.de sshd[34535]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=223.171.
...

Registration form abuse

"fail2ban match"

(sshd) Failed SSH login from 104.236.151.120 (US/United States/-): 5 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_SSHD; Logs: Jun  3 06:25:19 elude sshd[12622]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=104.236.151.120  user=root
Jun  3 06:25:20 elude sshd[12622]: Failed password for root from 104.236.151.120 port 48091 ssh2
Jun  3 06:36:30 elude sshd[14339]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=104.236.151.120  user=root
Jun  3 06:36:32 elude sshd[14339]: Failed password for root from 104.236.151.120 port 34687 ssh2
Jun  3 06:40:42 elude sshd[15028]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=104.236.151.120  user=root

(imapd) Failed IMAP login from 171.103.150.86 (TH/Thailand/171-103-150-86.static.asianet.co.th): 1 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_TRIGGER; Logs: Jun  3 08:26:51 ir1 dovecot[2885757]: imap-login: Disconnected (auth failed, 1 attempts in 5 secs): user=, method=PLAIN, rip=171.103.150.86, lip=5.63.12.44, session=

Unauthorized connection attempt detected from IP address 77.29.149.159 to port 8081