Feb  5 03:29:55 vtv3 sshd\[15261\]: Invalid user ts3 from 51.75.201.55 port 56930
Feb  5 03:29:55 vtv3 sshd\[15261\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.75.201.55
Feb  5 03:29:57 vtv3 sshd\[15261\]: Failed password for invalid user ts3 from 51.75.201.55 port 56930 ssh2
Feb  5 03:34:03 vtv3 sshd\[16558\]: Invalid user team from 51.75.201.55 port 60734
Feb  5 03:34:03 vtv3 sshd\[16558\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.75.201.55
Feb 10 11:29:54 vtv3 sshd\[13939\]: Invalid user rmsasi from 51.75.201.55 port 46914
Feb 10 11:29:54 vtv3 sshd\[13939\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.75.201.55
Feb 10 11:29:55 vtv3 sshd\[13939\]: Failed password for invalid user rmsasi from 51.75.201.55 port 46914 ssh2
Feb 10 11:35:14 vtv3 sshd\[16074\]: Invalid user zhouh from 51.75.201.55 port 36938
Feb 10 11:35:14 vtv3 sshd\[16074\]: pam_unix\(sshd:au

Jul 14 21:27:31 debian sshd\[12211\]: Invalid user jeff from 51.75.201.55 port 46716
Jul 14 21:27:31 debian sshd\[12211\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.75.201.55
Jul 14 21:27:33 debian sshd\[12211\]: Failed password for invalid user jeff from 51.75.201.55 port 46716 ssh2
...

Jul 14 04:21:17 62-210-73-4 sshd\[6817\]: Invalid user vargas from 51.75.201.55 port 55212
Jul 14 04:21:19 62-210-73-4 sshd\[6817\]: Failed password for invalid user vargas from 51.75.201.55 port 55212 ssh2
...

Jul 14 02:28:42 vibhu-HP-Z238-Microtower-Workstation sshd\[7508\]: Invalid user nash from 51.75.201.55
Jul 14 02:28:42 vibhu-HP-Z238-Microtower-Workstation sshd\[7508\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.75.201.55
Jul 14 02:28:44 vibhu-HP-Z238-Microtower-Workstation sshd\[7508\]: Failed password for invalid user nash from 51.75.201.55 port 60250 ssh2
Jul 14 02:35:58 vibhu-HP-Z238-Microtower-Workstation sshd\[7718\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.75.201.55  user=news
Jul 14 02:36:00 vibhu-HP-Z238-Microtower-Workstation sshd\[7718\]: Failed password for news from 51.75.201.55 port 33400 ssh2
...

2019-07-12T21:25:25.491042hub.schaetter.us sshd\[19138\]: Invalid user friedrich from 51.75.201.55
2019-07-12T21:25:25.539085hub.schaetter.us sshd\[19138\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=55.ip-51-75-201.eu
2019-07-12T21:25:27.569698hub.schaetter.us sshd\[19138\]: Failed password for invalid user friedrich from 51.75.201.55 port 44744 ssh2
2019-07-12T21:29:49.815510hub.schaetter.us sshd\[19175\]: Invalid user murilo from 51.75.201.55
2019-07-12T21:29:49.853736hub.schaetter.us sshd\[19175\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=55.ip-51-75-201.eu
...

2019-07-12T12:00:25.354718hub.schaetter.us sshd\[14864\]: Invalid user zope from 51.75.201.55
2019-07-12T12:00:25.393765hub.schaetter.us sshd\[14864\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=55.ip-51-75-201.eu
2019-07-12T12:00:27.212713hub.schaetter.us sshd\[14864\]: Failed password for invalid user zope from 51.75.201.55 port 46660 ssh2
2019-07-12T12:05:00.505823hub.schaetter.us sshd\[14907\]: Invalid user loop from 51.75.201.55
2019-07-12T12:05:00.574355hub.schaetter.us sshd\[14907\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=55.ip-51-75-201.eu
...

$f2bV_matches

May 22 23:22:55 meumeu sshd[147049]: Invalid user qhg from 51.75.201.137 port 38586
May 22 23:22:55 meumeu sshd[147049]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.75.201.137 
May 22 23:22:55 meumeu sshd[147049]: Invalid user qhg from 51.75.201.137 port 38586
May 22 23:22:57 meumeu sshd[147049]: Failed password for invalid user qhg from 51.75.201.137 port 38586 ssh2
May 22 23:25:25 meumeu sshd[147397]: Invalid user bvr from 51.75.201.137 port 57104
May 22 23:25:25 meumeu sshd[147397]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.75.201.137 
May 22 23:25:25 meumeu sshd[147397]: Invalid user bvr from 51.75.201.137 port 57104
May 22 23:25:26 meumeu sshd[147397]: Failed password for invalid user bvr from 51.75.201.137 port 57104 ssh2
May 22 23:27:50 meumeu sshd[147764]: Invalid user ole from 51.75.201.137 port 47390
...

$f2bV_matches

2020-05-11T07:38:35.0260061495-001 sshd[18175]: Failed password for invalid user admin from 51.75.201.137 port 60874 ssh2
2020-05-11T07:42:37.7723981495-001 sshd[18379]: Invalid user wwwdata from 51.75.201.137 port 43078
2020-05-11T07:42:37.7754811495-001 sshd[18379]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=137.ip-51-75-201.eu
2020-05-11T07:42:37.7723981495-001 sshd[18379]: Invalid user wwwdata from 51.75.201.137 port 43078
2020-05-11T07:42:39.3651091495-001 sshd[18379]: Failed password for invalid user wwwdata from 51.75.201.137 port 43078 ssh2
2020-05-11T07:46:43.6594721495-001 sshd[18591]: Invalid user smartworldmss from 51.75.201.137 port 53526
...

SSH brutforce

May 10 03:52:59 ip-172-31-61-156 sshd[7178]: Failed password for invalid user zabbix from 51.75.201.28 port 47580 ssh2
May 10 03:52:57 ip-172-31-61-156 sshd[7178]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.75.201.28
May 10 03:52:57 ip-172-31-61-156 sshd[7178]: Invalid user zabbix from 51.75.201.28
May 10 03:52:59 ip-172-31-61-156 sshd[7178]: Failed password for invalid user zabbix from 51.75.201.28 port 47580 ssh2
May 10 03:56:31 ip-172-31-61-156 sshd[7299]: Invalid user debbie from 51.75.201.28
...

May  7 21:15:12 Ubuntu-1404-trusty-64-minimal sshd\[21270\]: Invalid user bot from 51.75.201.137
May  7 21:15:12 Ubuntu-1404-trusty-64-minimal sshd\[21270\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.75.201.137
May  7 21:15:14 Ubuntu-1404-trusty-64-minimal sshd\[21270\]: Failed password for invalid user bot from 51.75.201.137 port 50684 ssh2
May  7 21:19:10 Ubuntu-1404-trusty-64-minimal sshd\[23072\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.75.201.137  user=root
May  7 21:19:12 Ubuntu-1404-trusty-64-minimal sshd\[23072\]: Failed password for root from 51.75.201.137 port 55828 ssh2

May  5 12:12:46 piServer sshd[14496]: Failed password for root from 51.75.201.137 port 46774 ssh2
May  5 12:16:21 piServer sshd[14774]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.75.201.137 
May  5 12:16:23 piServer sshd[14774]: Failed password for invalid user arjun from 51.75.201.137 port 55280 ssh2
...

May  4 14:53:36 PorscheCustomer sshd[21463]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.75.201.28
May  4 14:53:38 PorscheCustomer sshd[21463]: Failed password for invalid user hannah from 51.75.201.28 port 53490 ssh2
May  4 14:57:32 PorscheCustomer sshd[21618]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.75.201.28
...

Invalid user gk from 51.75.201.28 port 43918

Apr 26 13:17:57 vpn01 sshd[11690]: Failed password for root from 51.75.201.137 port 60074 ssh2
Apr 26 13:22:05 vpn01 sshd[11787]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.75.201.137
...

Bruteforce detected by fail2ban

Apr 21 23:20:51 vpn01 sshd[24000]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.75.201.137
Apr 21 23:20:53 vpn01 sshd[24000]: Failed password for invalid user test1 from 51.75.201.137 port 44986 ssh2
...

$f2bV_matches

2020-04-16T16:57:00.830114sd-86998 sshd[463]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=137.ip-51-75-201.eu  user=root
2020-04-16T16:57:03.164939sd-86998 sshd[463]: Failed password for root from 51.75.201.137 port 45630 ssh2
2020-04-16T17:00:25.461424sd-86998 sshd[1018]: Invalid user proxy from 51.75.201.137 port 52342
2020-04-16T17:00:25.466446sd-86998 sshd[1018]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=137.ip-51-75-201.eu
2020-04-16T17:00:25.461424sd-86998 sshd[1018]: Invalid user proxy from 51.75.201.137 port 52342
2020-04-16T17:00:27.279390sd-86998 sshd[1018]: Failed password for invalid user proxy from 51.75.201.137 port 52342 ssh2
...

SSH invalid-user multiple login try

port scan and connect, tcp 22 (ssh)

SSH/22 MH Probe, BF, Hack -

May  6 05:52:33 sip sshd[132170]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.235.190.177  user=root
May  6 05:52:35 sip sshd[132170]: Failed password for root from 49.235.190.177 port 49720 ssh2
May  6 05:57:32 sip sshd[132220]: Invalid user martin from 49.235.190.177 port 47484
...

May  6 05:45:00 mail postfix/smtpd\[16852\]: warning: unknown\[185.143.74.73\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
May  6 05:46:06 mail postfix/smtpd\[16493\]: warning: unknown\[185.143.74.73\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
May  6 05:47:14 mail postfix/smtpd\[16596\]: warning: unknown\[185.143.74.73\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
May  6 06:18:24 mail postfix/smtpd\[17503\]: warning: unknown\[185.143.74.73\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\

May  6 05:47:54 web01.agentur-b-2.de postfix/smtpd[86940]: NOQUEUE: reject: RCPT from unknown[103.57.80.48]: 554 5.7.1 Service unavailable; Client host [103.57.80.48] blocked using zen.spamhaus.org; https://www.spamhaus.org/sbl/query/SBLCSS / https://www.spamhaus.org/query/ip/103.57.80.48; from= to= proto=ESMTP helo=<10000.ru>
May  6 05:47:55 web01.agentur-b-2.de postfix/smtpd[86940]: NOQUEUE: reject: RCPT from unknown[103.57.80.48]: 554 5.7.1 Service unavailable; Client host [103.57.80.48] blocked using zen.spamhaus.org; https://www.spamhaus.org/sbl/query/SBLCSS / https://www.spamhaus.org/query/ip/103.57.80.48; from= to= proto=ESMTP helo=<10000.ru>
May  6 05:47:57 web01.agentur-b-2.de postfix/smtpd[86940]: NOQUEUE: reject: RCPT from unknown[103.57.80.48]: 554 5.7.1 Service unavailable; Client host [103.57.80.48] blocked using zen.spamhaus.org; https://www.spamhaus.org/sbl/query/SBLCSS / https://www.spamhaus.org/

May  6 04:32:52 scw-6657dc sshd[3151]: Failed password for root from 222.186.30.76 port 28009 ssh2
May  6 04:32:52 scw-6657dc sshd[3151]: Failed password for root from 222.186.30.76 port 28009 ssh2
May  6 04:32:54 scw-6657dc sshd[3151]: Failed password for root from 222.186.30.76 port 28009 ssh2
...

May  5 22:11:31 server1 sshd\[11179\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=167.172.232.41  user=root
May  5 22:11:33 server1 sshd\[11179\]: Failed password for root from 167.172.232.41 port 55798 ssh2
May  5 22:17:56 server1 sshd\[13037\]: Invalid user student02 from 167.172.232.41
May  5 22:17:56 server1 sshd\[13037\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=167.172.232.41 
May  5 22:17:58 server1 sshd\[13037\]: Failed password for invalid user student02 from 167.172.232.41 port 35444 ssh2
...

$f2bV_matches

May  6 06:00:13 mail.srvfarm.net postfix/smtpd[128459]: NOQUEUE: reject: RCPT from unknown[217.112.142.179]: 450 4.1.8 : Sender address rejected: Domain not found; from= to= proto=ESMTP helo=
May  6 06:00:13 mail.srvfarm.net postfix/smtpd[129848]: NOQUEUE: reject: RCPT from unknown[217.112.142.179]: 450 4.1.8 : Sender address rejected: Domain not found; from= to= proto=ESMTP helo=
May  6 06:00:13 mail.srvfarm.net postfix/smtpd[130040]: NOQUEUE: reject: RCPT from unknown[217.112.142.179]: 450 4.1.8 : Sender address rejected: Domain not found; from= to= proto=ESMTP helo=
May  6 06:01:25 mail.sr

2020-05-06T06:32:15.794557hz01.yumiweb.com sshd\[14862\]: Invalid user fake from 209.141.37.175 port 54742
2020-05-06T06:32:17.030630hz01.yumiweb.com sshd\[14864\]: Invalid user ubnt from 209.141.37.175 port 56854
2020-05-06T06:32:19.475051hz01.yumiweb.com sshd\[14868\]: Invalid user admin from 209.141.37.175 port 60512
...

Brute force attempt

May  6 01:32:08 firewall sshd[7104]: Failed password for root from 222.186.42.155 port 39553 ssh2
May  6 01:32:11 firewall sshd[7104]: Failed password for root from 222.186.42.155 port 39553 ssh2
May  6 01:32:13 firewall sshd[7104]: Failed password for root from 222.186.42.155 port 39553 ssh2
...

Target: MSSQL :1433 [Brute-force]

May  6 05:54:06 buvik sshd[17114]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.201.74.107
May  6 05:54:08 buvik sshd[17114]: Failed password for invalid user jan from 121.201.74.107 port 57668 ssh2
May  6 05:57:57 buvik sshd[17653]: Invalid user bhavin from 121.201.74.107
...

SSH Brute-Force Attack