Aug 27 01:31:12 MK-Soft-VM3 sshd\[2027\]: Invalid user support from 175.6.77.235 port 35956
Aug 27 01:31:12 MK-Soft-VM3 sshd\[2027\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=175.6.77.235
Aug 27 01:31:13 MK-Soft-VM3 sshd\[2027\]: Failed password for invalid user support from 175.6.77.235 port 35956 ssh2
...

Aug 26 19:39:07 ny01 sshd[19112]: Failed password for root from 115.59.7.45 port 60139 ssh2
Aug 26 19:39:17 ny01 sshd[19112]: Failed password for root from 115.59.7.45 port 60139 ssh2
Aug 26 19:39:19 ny01 sshd[19112]: Failed password for root from 115.59.7.45 port 60139 ssh2
Aug 26 19:39:19 ny01 sshd[19112]: error: maximum authentication attempts exceeded for root from 115.59.7.45 port 60139 ssh2 [preauth]

Aug 27 04:39:54 mail sshd\[2138\]: Invalid user maurta from 154.66.113.78 port 50802
Aug 27 04:39:54 mail sshd\[2138\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=154.66.113.78
Aug 27 04:39:57 mail sshd\[2138\]: Failed password for invalid user maurta from 154.66.113.78 port 50802 ssh2
Aug 27 04:45:16 mail sshd\[2839\]: Invalid user train5 from 154.66.113.78 port 39130
Aug 27 04:45:16 mail sshd\[2839\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=154.66.113.78

Aug 27 08:52:15 areeb-Workstation sshd\[17003\]: Invalid user siphiwo from 8.209.67.241
Aug 27 08:52:15 areeb-Workstation sshd\[17003\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=8.209.67.241
Aug 27 08:52:17 areeb-Workstation sshd\[17003\]: Failed password for invalid user siphiwo from 8.209.67.241 port 47368 ssh2
...

Aug 27 01:38:56 MK-Soft-Root2 sshd\[24564\]: Invalid user 123321 from 222.128.2.60 port 36079
Aug 27 01:38:56 MK-Soft-Root2 sshd\[24564\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.128.2.60
Aug 27 01:38:58 MK-Soft-Root2 sshd\[24564\]: Failed password for invalid user 123321 from 222.128.2.60 port 36079 ssh2
...

[Aegis] @ 2019-08-27 00:38:55  0100 -> Sendmail rejected due to pre-greeting.

Splunk® : port scan detected:
Aug 26 19:49:04 testbed kernel: Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC=82:c6:52:d1:6e:53:64:c3:d6:0b:ef:f0:08:00 SRC=37.49.231.130 DST=104.248.11.191 LEN=40 TOS=0x00 PREC=0x00 TTL=241 ID=8205 PROTO=TCP SPT=58260 DPT=50802 WINDOW=1024 RES=0x00 SYN URGP=0

Aug 27 05:55:20 yabzik sshd[29677]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=37.187.113.229
Aug 27 05:55:22 yabzik sshd[29677]: Failed password for invalid user edu from 37.187.113.229 port 34268 ssh2
Aug 27 05:59:49 yabzik sshd[30931]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=37.187.113.229

$f2bV_matches

Aug 27 08:27:16 areeb-Workstation sshd\[15588\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.88.112.85  user=root
Aug 27 08:27:18 areeb-Workstation sshd\[15588\]: Failed password for root from 49.88.112.85 port 20064 ssh2
Aug 27 08:27:30 areeb-Workstation sshd\[15590\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.88.112.85  user=root
...

2019-08-27T02:50:03.441797abusebot-5.cloudsearch.cf sshd\[13075\]: Invalid user ftpuser from 147.135.255.107 port 51458

2019-08-26 18:33:55 H=e2e-36-163.e2enetworks.net.in [101.53.139.163]:51230 I=[192.147.25.65]:25 sender verify fail for : all relevant MX records point to non-existent hosts
2019-08-26 18:33:55 H=e2e-36-163.e2enetworks.net.in [101.53.139.163]:51230 I=[192.147.25.65]:25 F= rejected RCPT : Sender verify failed
2019-08-26 18:37:57 H=e2e-36-163.e2enetworks.net.in [101.53.139.163]:16866 I=[192.147.25.65]:25 F= rejected RCPT : RBL: found in thrukfz5b56tq6xao6odgdyjrq.zen.dq.spamhaus.net (127.0.0.4) (https://www.spamhaus.org/query/ip/101.53.139.163)
...

Aug 26 23:30:42 vps200512 sshd\[16469\]: Invalid user oracle from 130.61.83.71
Aug 26 23:30:42 vps200512 sshd\[16469\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=130.61.83.71
Aug 26 23:30:44 vps200512 sshd\[16469\]: Failed password for invalid user oracle from 130.61.83.71 port 64147 ssh2
Aug 26 23:36:47 vps200512 sshd\[16597\]: Invalid user server from 130.61.83.71
Aug 26 23:36:47 vps200512 sshd\[16597\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=130.61.83.71

Aug 27 04:02:27 SilenceServices sshd[10874]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.12.58.4
Aug 27 04:02:28 SilenceServices sshd[10874]: Failed password for invalid user christine from 106.12.58.4 port 45988 ssh2
Aug 27 04:06:44 SilenceServices sshd[12640]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.12.58.4

Aug 26 20:24:03 home sshd[26887]: Invalid user atendimento from 54.36.163.70 port 49339
Aug 26 20:24:03 home sshd[26887]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=54.36.163.70
Aug 26 20:24:03 home sshd[26887]: Invalid user atendimento from 54.36.163.70 port 49339
Aug 26 20:24:05 home sshd[26887]: Failed password for invalid user atendimento from 54.36.163.70 port 49339 ssh2
Aug 26 20:34:22 home sshd[26919]: Invalid user wwwrun from 54.36.163.70 port 43637
Aug 26 20:34:22 home sshd[26919]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=54.36.163.70
Aug 26 20:34:22 home sshd[26919]: Invalid user wwwrun from 54.36.163.70 port 43637
Aug 26 20:34:24 home sshd[26919]: Failed password for invalid user wwwrun from 54.36.163.70 port 43637 ssh2
Aug 26 20:38:02 home sshd[26938]: Invalid user lillian from 54.36.163.70 port 37919
Aug 26 20:38:02 home sshd[26938]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ss