SSH login attempts.

Unauthorized connection attempt from IP address 125.166.138.99 on Port 445(SMB)

80.82.78.100 was recorded 21 times by 10 hosts attempting to connect to the following ports: 1023,648,998. Incident counter (4h, 24h, all-time): 21, 80, 23153

[2020-04-02 04:37:55] NOTICE[12114] chan_sip.c: Registration from '' failed for '185.147.212.8:49387' - Wrong password
[2020-04-02 04:37:55] SECURITY[12128] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-04-02T04:37:55.208-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="370",SessionID="0x7f020c05ea88",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/185.147.212.8/49387",Challenge="1a7d024f",ReceivedChallenge="1a7d024f",ReceivedHash="714222b30dfc523e45f8f3c67a17bcfb"
[2020-04-02 04:38:51] NOTICE[12114] chan_sip.c: Registration from '' failed for '185.147.212.8:63035' - Wrong password
[2020-04-02 04:38:51] SECURITY[12128] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-04-02T04:38:51.891-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="8753",SessionID="0x7f020c04de18",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/185.147.212
...

(sshd) Failed SSH login from 181.47.187.229 (AR/Argentina/cpe-181-47-187-229.telecentro-reversos.com.ar): 5 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_SSHD; Logs: Apr  2 05:38:54 amsweb01 sshd[14474]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=181.47.187.229  user=root
Apr  2 05:38:56 amsweb01 sshd[14474]: Failed password for root from 181.47.187.229 port 55490 ssh2
Apr  2 05:49:47 amsweb01 sshd[15729]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=181.47.187.229  user=root
Apr  2 05:49:49 amsweb01 sshd[15729]: Failed password for root from 181.47.187.229 port 60828 ssh2
Apr  2 05:55:06 amsweb01 sshd[16365]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=181.47.187.229  user=root

Attempt to attack host OS, exploiting network vulnerabilities, on 02-04-2020 04:55:11.

Apr  2 05:37:50 web01.agentur-b-2.de postfix/smtpd[64779]: NOQUEUE: reject: RCPT from shocker.juntosms.com[134.73.51.53]: 450 4.7.1 : Helo command rejected: Host not found; from= to= proto=ESMTP helo=
Apr  2 05:37:58 web01.agentur-b-2.de postfix/smtpd[64780]: NOQUEUE: reject: RCPT from shocker.juntosms.com[134.73.51.53]: 450 4.7.1 : Helo command rejected: Host not found; from= to= proto=ESMTP helo=
Apr  2 05:39:38 web01.agentur-b-2.de postfix/smtpd[64779]: NOQUEUE: reject: RCPT from shocker.juntosms.com[134.73.51.53]: 450 4.7.1 : Helo command rejected: Host not found; from= to= proto=ESMTP helo=
Apr  2 05:39:56 web01.agentur-b-2.de postfix/smtpd[64780]: NOQUEUE: reject: RCPT from shocker.juntosms.com[134.73

Lines containing failures of 82.148.18.109
Apr  1 20:33:38 shared11 sshd[26037]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=82.148.18.109  user=r.r
Apr  1 20:33:41 shared11 sshd[26037]: Failed password for r.r from 82.148.18.109 port 60300 ssh2
Apr  1 20:33:41 shared11 sshd[26037]: Received disconnect from 82.148.18.109 port 60300:11: Bye Bye [preauth]
Apr  1 20:33:41 shared11 sshd[26037]: Disconnected from authenticating user r.r 82.148.18.109 port 60300 [preauth]
Apr  1 20:50:47 shared11 sshd[32092]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=82.148.18.109  user=r.r
Apr  1 20:50:50 shared11 sshd[32092]: Failed password for r.r from 82.148.18.109 port 44600 ssh2
Apr  1 20:50:50 shared11 sshd[32092]: Received disconnect from 82.148.18.109 port 44600:11: Bye Bye [preauth]
Apr  1 20:50:50 shared11 sshd[32092]: Disconnected from authenticating user r.r 82.148.18.109 port 44600 [preauth........
------------------------------

[2020-04-02 05:20:17] NOTICE[12114][C-000000c2] chan_sip.c: Call from '' (104.168.48.107:64931) to extension '011972592698190' rejected because extension not found in context 'public'.
[2020-04-02 05:20:17] SECURITY[12128] res_security_log.c: SecurityEvent="FailedACL",EventTV="2020-04-02T05:20:17.936-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="011972592698190",SessionID="0x7f020c05ea88",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/104.168.48.107/64931",ACLName="no_extension_match"
[2020-04-02 05:20:17] NOTICE[12114][C-000000c3] chan_sip.c: Call from '' (104.168.48.107:64933) to extension '011970592698190' rejected because extension not found in context 'public'.
[2020-04-02 05:20:17] SECURITY[12128] res_security_log.c: SecurityEvent="FailedACL",EventTV="2020-04-02T05:20:17.936-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="011970592698190",SessionID="0x7f020c0220b8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IP
...

2020-04-02T06:07:55.874990shield sshd\[14876\]: Invalid user user from 157.230.190.90 port 36792
2020-04-02T06:07:55.878816shield sshd\[14876\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=157.230.190.90
2020-04-02T06:07:58.500675shield sshd\[14876\]: Failed password for invalid user user from 157.230.190.90 port 36792 ssh2
2020-04-02T06:13:10.366714shield sshd\[16720\]: Invalid user ts from 157.230.190.90 port 52270
2020-04-02T06:13:10.369959shield sshd\[16720\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=157.230.190.90

Apr  2 10:29:57 meumeu sshd[672]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=138.197.163.11 
Apr  2 10:29:59 meumeu sshd[672]: Failed password for invalid user max from 138.197.163.11 port 40564 ssh2
Apr  2 10:33:51 meumeu sshd[1179]: Failed password for root from 138.197.163.11 port 52036 ssh2
...

'Fail2Ban'

Invalid user dp from 118.24.158.42 port 34020

Port scan detected on ports: 8433[TCP], 4433[TCP], 2433[TCP]

Apr  2 10:18:59 odroid64 sshd\[20748\]: User root from 120.70.100.2 not allowed because not listed in AllowUsers
Apr  2 10:19:00 odroid64 sshd\[20748\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=120.70.100.2  user=root
...