Jul 16 16:03:19 mail1 sshd[12950]: Invalid user btc from 79.130.215.37 port 57110
Jul 16 16:03:19 mail1 sshd[12950]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=79.130.215.37
Jul 16 16:03:21 mail1 sshd[12950]: Failed password for invalid user btc from 79.130.215.37 port 57110 ssh2
Jul 16 16:03:22 mail1 sshd[12950]: Received disconnect from 79.130.215.37 port 57110:11: Bye Bye [preauth]
Jul 16 16:03:22 mail1 sshd[12950]: Disconnected from 79.130.215.37 port 57110 [preauth]


........
-----------------------------------------------
https://www.blocklist.de/en/view.html?ip=79.130.215.37

Tried sshing with brute force.

Fail2Ban Ban Triggered

20/7/19@19:37:24: FAIL: Alarm-Network address from=165.225.112.210
...

 TCP (SYN) 182.61.24.101:57265 -> port 373, len 44

Jul 20 02:37:11 hosting sshd[19719]: Invalid user woo from 51.158.124.238 port 36076
...

SSH brute force

Jul 19 23:50:32 rush sshd[2482]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=139.198.17.31
Jul 19 23:50:34 rush sshd[2482]: Failed password for invalid user ts3bot from 139.198.17.31 port 47244 ssh2
Jul 19 23:55:14 rush sshd[2611]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=139.198.17.31
...

Jul 19 18:00:51 v22019038103785759 sshd\[824\]: Invalid user pi from 178.0.204.135 port 41302
Jul 19 18:00:51 v22019038103785759 sshd\[824\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=178.0.204.135
Jul 19 18:00:51 v22019038103785759 sshd\[826\]: Invalid user pi from 178.0.204.135 port 41312
Jul 19 18:00:51 v22019038103785759 sshd\[826\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=178.0.204.135
Jul 19 18:00:54 v22019038103785759 sshd\[824\]: Failed password for invalid user pi from 178.0.204.135 port 41302 ssh2
...

Jul 19 18:00:50 tor-proxy-04 sshd\[22082\]: User root from 52.156.120.194 not allowed because not listed in AllowUsers
Jul 19 18:00:50 tor-proxy-04 sshd\[22082\]: error: maximum authentication attempts exceeded for invalid user root from 52.156.120.194 port 35506 ssh2 \[preauth\]
Jul 19 18:00:52 tor-proxy-04 sshd\[22084\]: User root from 52.156.120.194 not allowed because not listed in AllowUsers
Jul 19 18:00:52 tor-proxy-04 sshd\[22084\]: error: maximum authentication attempts exceeded for invalid user root from 52.156.120.194 port 35578 ssh2 \[preauth\]
...

Jul 20 01:28:49 icinga sshd[8146]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.79.84.101 
Jul 20 01:28:51 icinga sshd[8146]: Failed password for invalid user jesse from 51.79.84.101 port 60822 ssh2
Jul 20 01:37:18 icinga sshd[22839]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.79.84.101 
...

Jul 20 01:37:17 [host] sshd[27411]: Invalid user t
Jul 20 01:37:17 [host] sshd[27411]: pam_unix(sshd:
Jul 20 01:37:19 [host] sshd[27411]: Failed passwor

2020-07-19T16:37:19.157939-07:00 suse-nuc sshd[11076]: Invalid user bini from 183.237.175.97 port 40115
...

spf=pass (sender IP is 154.67.11.12) smtp.mailfrom=mohamed@contactoi.com smtp.helo=mail.contactoi.com
Received-SPF: pass (xxxxxxx.xxx: domain of contactoi.com designates 154.67.11.12 as permitted sender) client-ip=154.67.11.12; envelope-from=mohamed@contactoi.com; helo=mail.contactoi.com;
Received: from localhost (mail.contactoi.com [127.0.0.1])
	by mail.contactoi.com (Postfix) with ESMTP id CCB21A29B4
	for ; Sat, 18 Jul 2020 23:39:15 +0400 (+04)
X-Virus-Scanned: Debian amavisd-new at mail.contactoi.com
X-Amavis-Alert: BAD HEADER SECTION, Missing required header field: "Date"
Received: from mail.contactoi.com ([127.0.0.1])
	by localhost (mail.contactoi.com [127.0.0.1]) (amavisd-new, port 10024)
	with ESMTP id Br1phzChmEqU for ;
	Sat, 18 Jul 2020 23:39:09 +0400 (+04)

Email rejected due to spam filtering