Feb 13 06:48:50 cvbnet sshd[8511]: Failed password for root from 46.101.124.220 port 53227 ssh2
...

port scan

[2020-02-13 05:19:36] NOTICE[1148] chan_sip.c: Registration from '"10000" ' failed for '51.89.99.24:5293' - Wrong password
[2020-02-13 05:19:36] SECURITY[1163] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-02-13T05:19:36.412-0500",Severity="Error",Service="SIP",EventVersion="2",AccountID="10000",SessionID="0x7fd82c3c1c38",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/51.89.99.24/5293",Challenge="12ab005d",ReceivedChallenge="12ab005d",ReceivedHash="47df966202fa3809d85504b0ecaf8a40"
[2020-02-13 05:19:36] NOTICE[1148] chan_sip.c: Registration from '"10000" ' failed for '51.89.99.24:5293' - Wrong password
[2020-02-13 05:19:36] SECURITY[1163] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-02-13T05:19:36.559-0500",Severity="Error",Service="SIP",EventVersion="2",AccountID="10000",SessionID="0x7fd82c2bd8a8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/51
...

2020-02-13T05:37:46.389960struts4.enskede.local sshd\[19697\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=112.17.190.29  user=root
2020-02-13T05:37:50.665130struts4.enskede.local sshd\[19697\]: Failed password for root from 112.17.190.29 port 14006 ssh2
2020-02-13T05:42:11.191996struts4.enskede.local sshd\[19718\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=112.17.190.29  user=root
2020-02-13T05:42:15.037948struts4.enskede.local sshd\[19718\]: Failed password for root from 112.17.190.29 port 22811 ssh2
2020-02-13T05:46:34.670831struts4.enskede.local sshd\[19743\]: Invalid user morgan from 112.17.190.29 port 31616
...

Feb 13 05:43:22 legacy sshd[22857]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=115.159.235.17
Feb 13 05:43:24 legacy sshd[22857]: Failed password for invalid user Jonny from 115.159.235.17 port 47932 ssh2
Feb 13 05:47:48 legacy sshd[23115]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=115.159.235.17
...

unauthorized connection attempt

Unauthorised access (Feb 13) SRC=220.132.0.42 LEN=40 TTL=45 ID=21868 TCP DPT=23 WINDOW=52930 SYN

Feb 13 09:52:02 v22018076622670303 sshd\[29031\]: Invalid user weblogic@123 from 170.253.6.125 port 52150
Feb 13 09:52:02 v22018076622670303 sshd\[29031\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=170.253.6.125
Feb 13 09:52:04 v22018076622670303 sshd\[29031\]: Failed password for invalid user weblogic@123 from 170.253.6.125 port 52150 ssh2
...

2020-02-12T23:21:20.6101741495-001 sshd[51268]: Invalid user git from 58.209.234.87 port 44202
2020-02-12T23:21:20.6206691495-001 sshd[51268]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=58.209.234.87
2020-02-12T23:21:20.6101741495-001 sshd[51268]: Invalid user git from 58.209.234.87 port 44202
2020-02-12T23:21:22.1070641495-001 sshd[51268]: Failed password for invalid user git from 58.209.234.87 port 44202 ssh2
2020-02-12T23:25:48.7656001495-001 sshd[51549]: Invalid user b1 from 58.209.234.87 port 41460
2020-02-12T23:25:48.7687081495-001 sshd[51549]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=58.209.234.87
2020-02-12T23:25:48.7656001495-001 sshd[51549]: Invalid user b1 from 58.209.234.87 port 41460
2020-02-12T23:25:50.7157831495-001 sshd[51549]: Failed password for invalid user b1 from 58.209.234.87 port 41460 ssh2
2020-02-12T23:30:20.9203531495-001 sshd[51816]: Invalid user student04 from 58.209.
...

Feb 13 04:03:41 firewall sshd[27094]: Invalid user tecnofrota_teste from 112.35.26.43
Feb 13 04:03:43 firewall sshd[27094]: Failed password for invalid user tecnofrota_teste from 112.35.26.43 port 42914 ssh2
Feb 13 04:11:38 firewall sshd[27366]: Invalid user aoyule from 112.35.26.43
...

2020-02-13T10:53:12.260098shield sshd\[26496\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=61.177.172.158  user=root
2020-02-13T10:53:14.534321shield sshd\[26496\]: Failed password for root from 61.177.172.158 port 35268 ssh2
2020-02-13T10:53:16.995408shield sshd\[26496\]: Failed password for root from 61.177.172.158 port 35268 ssh2
2020-02-13T10:53:19.203223shield sshd\[26496\]: Failed password for root from 61.177.172.158 port 35268 ssh2
2020-02-13T10:58:54.426899shield sshd\[26992\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=61.177.172.158  user=root

2020-02-13T04:48:20.551004homeassistant sshd[29439]: Failed password for invalid user stupid from 210.66.141.83 port 59158 ssh2
2020-02-13T10:01:03.824160homeassistant sshd[381]: Invalid user vyatta from 210.66.141.83 port 36674
2020-02-13T10:01:03.831026homeassistant sshd[381]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=210.66.141.83
...

Feb 13 05:47:39 vmd46246 kernel: [5480672.069762] [UFW BLOCK] IN=eth0 OUT= MAC=00:50:56:3e:fb:88:28:99:3a:4d:23:91:08:00 SRC=52.171.214.61 DST=144.91.112.181 LEN=60 TOS=0x00 PREC=0x00 TTL=54 ID=39905 DF PROTO=TCP SPT=52242 DPT=25503 WINDOW=64240 RES=0x00 SYN URGP=0 
Feb 13 05:47:39 vmd46246 kernel: [5480672.069830] [UFW BLOCK] IN=eth0 OUT= MAC=00:50:56:3e:fb:88:28:99:3a:4d:23:91:08:00 SRC=52.171.214.61 DST=144.91.112.181 LEN=60 TOS=0x00 PREC=0x00 TTL=51 ID=4949 DF PROTO=TCP SPT=46112 DPT=25505 WINDOW=64240 RES=0x00 SYN URGP=0 
Feb 13 05:47:39 vmd46246 kernel: [5480672.069847] [UFW BLOCK] IN=eth0 OUT= MAC=00:50:56:3e:fb:88:28:99:3a:4d:23:91:08:00 SRC=52.171.214.61 DST=144.91.112.181 LEN=60 TOS=0x00 PREC=0x00 TTL=54 ID=35303 DF PROTO=TCP SPT=36862 DPT=25502 WINDOW=64240 RES=0x00 SYN URGP=0 
Feb 13 05:47:39 vmd46246 kernel: [5480672.069862] [UFW BLOCK] IN=eth0 OUT= MAC=00:50:56:3e:fb:88:28:99:3a:4d:23:91:08:00 SRC=52.171.214.61 DST=144.91.112.181 LEN=60 TOS=0x00 PREC=0x00 TTL=51 ID=28202 
...

$f2bV_matches

Telnet/23 MH Probe, BF, Hack -