Jul 23 23:42:47 SilenceServices sshd[16282]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=94.23.9.204
Jul 23 23:42:49 SilenceServices sshd[16282]: Failed password for invalid user gong from 94.23.9.204 port 49612 ssh2
Jul 23 23:47:02 SilenceServices sshd[19325]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=94.23.9.204

23.07.2019 20:47:14 Connection to port 17901 blocked by firewall

Jul 24 00:29:38 MK-Soft-Root2 sshd\[16207\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=212.64.44.165  user=www-data
Jul 24 00:29:40 MK-Soft-Root2 sshd\[16207\]: Failed password for www-data from 212.64.44.165 port 38140 ssh2
Jul 24 00:32:39 MK-Soft-Root2 sshd\[16604\]: Invalid user mc from 212.64.44.165 port 44148
Jul 24 00:32:39 MK-Soft-Root2 sshd\[16604\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=212.64.44.165
...

Jul 23 23:57:51 mail sshd\[12643\]: Invalid user build from 112.78.177.15 port 57562
Jul 23 23:57:51 mail sshd\[12643\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=112.78.177.15
Jul 23 23:57:52 mail sshd\[12643\]: Failed password for invalid user build from 112.78.177.15 port 57562 ssh2
Jul 24 00:03:03 mail sshd\[4803\]: Invalid user sistemas from 112.78.177.15 port 52496
Jul 24 00:03:03 mail sshd\[4803\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=112.78.177.15

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\[2019-07-23 23:32:12\] NOTICE\[23191\] res_pjsip/pjsip_distributor.c: Request 'REGISTER' from '"601" \' failed for '77.247.109.5:5923' \(callid: 3939905980\) - Failed to authenticate
\[2019-07-23 23:32:12\] SECURITY\[1715\] res_security_log.c: SecurityEvent="ChallengeResponseFailed",EventTV="2019-07-23T23:32:12.949+0200",Severity="Error",Service="PJSIP",EventVersion="1",AccountID="\",SessionID="3939905980",LocalAddress="IPV4/UDP/188.40.118.248/5060",RemoteAddress="IPV4/UDP/77.247.109.5/5923",Challenge="1563917532/9ba6b2314db0b2d71d3a934a40b86456",Response="8665dfe02a9b3e8c5a3006ba44af869e",ExpectedResponse=""
\[2019-07-23 23:32:12\] NOTICE\[603\] res_pjsip/pjsip_distributor.c: Request 'REGISTER' from '"601" \' failed for '77.247.109.5:5923' \(callid: 2967951394\) - No matching endpoint found after 5 tries in 0.960 ms
\[2019-07-23 23:32:12\] SECURITY\[1715\] res_security_log.c: SecurityEvent="InvalidAccountID",EventTV="2019-07-23T23:32:1

Invalid user nagios from 78.97.92.249 port 60602

Jul 23 21:15:23 animalibera sshd[3344]: Failed password for root from 49.88.112.62 port 61127 ssh2
Jul 23 21:15:25 animalibera sshd[3344]: Failed password for root from 49.88.112.62 port 61127 ssh2
Jul 23 21:15:28 animalibera sshd[3344]: Failed password for root from 49.88.112.62 port 61127 ssh2
Jul 23 21:15:31 animalibera sshd[3344]: Failed password for root from 49.88.112.62 port 61127 ssh2
Jul 23 21:15:33 animalibera sshd[3344]: Failed password for root from 49.88.112.62 port 61127 ssh2
...

Splunk® : Brute-Force login attempt on SSH:
Jul 23 16:19:39 testbed sshd[31552]: Connection closed by 93.159.9.135 port 65247 [preauth]

$f2bV_matches

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Invalid user postgres from 46.101.27.6 port 60384

Splunk® : port scan detected:
Jul 23 16:20:24 testbed kernel: Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC=82:c6:52:d1:6e:53:c0:42:d0:39:2c:30:08:00 SRC=185.127.27.222 DST=104.248.11.191 LEN=40 TOS=0x00 PREC=0x00 TTL=245 ID=18356 PROTO=TCP SPT=48932 DPT=3390 WINDOW=1024 RES=0x00 SYN URGP=0

Invalid user applmgr from 106.13.74.47 port 35878