[2020-05-21 00:23:34] NOTICE[1157][C-00007b79] chan_sip.c: Call from '' (103.253.42.59:54456) to extension '+46812400987' rejected because extension not found in context 'public'.
[2020-05-21 00:23:34] SECURITY[1173] res_security_log.c: SecurityEvent="FailedACL",EventTV="2020-05-21T00:23:34.764-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="+46812400987",SessionID="0x7f5f100266a8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/103.253.42.59/54456",ACLName="no_extension_match"
[2020-05-21 00:25:35] NOTICE[1157][C-00007b7b] chan_sip.c: Call from '' (103.253.42.59:57665) to extension '0046812400987' rejected because extension not found in context 'public'.
[2020-05-21 00:25:35] SECURITY[1173] res_security_log.c: SecurityEvent="FailedACL",EventTV="2020-05-21T00:25:35.598-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="0046812400987",SessionID="0x7f5f100266a8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/103.253.42
...

Brute-Force

May 21 06:32:28 web01 sshd[21948]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.233.139.218 
May 21 06:32:31 web01 sshd[21948]: Failed password for invalid user xtw from 49.233.139.218 port 41786 ssh2
...

May 21 06:58:55 server sshd[37058]: Failed password for invalid user lbzhang from 123.30.236.149 port 58074 ssh2
May 21 07:03:16 server sshd[40620]: Failed password for invalid user feb from 123.30.236.149 port 55710 ssh2
May 21 07:07:44 server sshd[44055]: Failed password for invalid user chs from 123.30.236.149 port 53364 ssh2

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Message-ID: 
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Reply-To: =?utf-8?B?0JTQsNC80LjRgCDQkNC70LXQutGB0LDQvdC00YDQvtCy?=  
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2020-05-21T06:59:40.884139vps773228.ovh.net sshd[10383]: Failed password for root from 222.186.52.39 port 38329 ssh2
2020-05-21T06:59:42.742534vps773228.ovh.net sshd[10383]: Failed password for root from 222.186.52.39 port 38329 ssh2
2020-05-21T06:59:44.561200vps773228.ovh.net sshd[10383]: Failed password for root from 222.186.52.39 port 38329 ssh2
2020-05-21T06:59:54.216614vps773228.ovh.net sshd[10385]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.52.39  user=root
2020-05-21T06:59:55.798948vps773228.ovh.net sshd[10385]: Failed password for root from 222.186.52.39 port 41557 ssh2
...

$f2bV_matches

May 21 06:24:29 buvik sshd[1859]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.13.81.162
May 21 06:24:30 buvik sshd[1859]: Failed password for invalid user yaf from 106.13.81.162 port 40176 ssh2
May 21 06:27:22 buvik sshd[2362]: Invalid user gad from 106.13.81.162
...

May 21 07:06:49 sip sshd[344578]: Invalid user zkd from 128.199.138.31 port 54585
May 21 07:06:50 sip sshd[344578]: Failed password for invalid user zkd from 128.199.138.31 port 54585 ssh2
May 21 07:10:48 sip sshd[344587]: Invalid user pqo from 128.199.138.31 port 57338
...

2020-05-21T04:41:09.695653shield sshd\[24665\]: Invalid user wpc from 46.14.13.126 port 20041
2020-05-21T04:41:09.698815shield sshd\[24665\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=126.13.14.46.static.wline.lns.sme.cust.swisscom.ch
2020-05-21T04:41:11.177809shield sshd\[24665\]: Failed password for invalid user wpc from 46.14.13.126 port 20041 ssh2
2020-05-21T04:44:56.761035shield sshd\[25265\]: Invalid user cxz from 46.14.13.126 port 3030
2020-05-21T04:44:56.764764shield sshd\[25265\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=126.13.14.46.static.wline.lns.sme.cust.swisscom.ch

Port probing on unauthorized port 445

May 21 05:41:47 ns382633 sshd\[29789\]: Invalid user hzt from 179.182.68.224 port 37714
May 21 05:41:47 ns382633 sshd\[29789\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=179.182.68.224
May 21 05:41:50 ns382633 sshd\[29789\]: Failed password for invalid user hzt from 179.182.68.224 port 37714 ssh2
May 21 05:57:57 ns382633 sshd\[32703\]: Invalid user ksr from 179.182.68.224 port 34072
May 21 05:57:57 ns382633 sshd\[32703\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=179.182.68.224

May 21 07:20:48 OPSO sshd\[8118\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.190.14  user=root
May 21 07:20:50 OPSO sshd\[8118\]: Failed password for root from 222.186.190.14 port 62836 ssh2
May 21 07:20:52 OPSO sshd\[8118\]: Failed password for root from 222.186.190.14 port 62836 ssh2
May 21 07:20:54 OPSO sshd\[8118\]: Failed password for root from 222.186.190.14 port 62836 ssh2
May 21 07:21:19 OPSO sshd\[8310\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.190.14  user=root

05/20/2020-23:58:40.378623 94.102.51.31 Protocol: 6 ET SCAN NMAP -sS window 1024

May 21 07:02:45 vpn01 sshd[16060]: Failed password for root from 222.186.30.218 port 58681 ssh2
...