Various connection attempts from this IP

repeated >200 times:
Aug 13 22:18:14 localhost postfix/smtpd[1939]: connect from unknown[37.49.230.33]

Bible

2020-10-13T06:44:21.356144news0 auth[956]: pam_unix(dovecot:auth): authentication failure; logname= uid=0 euid=0 tty=dovecot ruser=admin rhost=37.49.230.238
2020-10-13T06:44:25.395781news0 dovecot[21131]: pop3-login: Aborted login (auth failed, 1 attempts in 4 secs): user=, method=PLAIN, rip=37.49.230.238, lip=95.111.246.42, session=
2020-10-13T06:44:28.401407news0 auth[956]: pam_unix(dovecot:auth): authentication failure; logname= uid=0 euid=0 tty=dovecot ruser=admin rhost=37.49.230.238
...

2020-10-13T06:44:21.356144news0 auth[956]: pam_unix(dovecot:auth): authentication failure; logname= uid=0 euid=0 tty=dovecot ruser=admin rhost=37.49.230.238
2020-10-13T06:44:25.395781news0 dovecot[21131]: pop3-login: Aborted login (auth failed, 1 attempts in 4 secs): user=, method=PLAIN, rip=37.49.230.238, lip=95.111.246.42, session=
2020-10-13T06:44:28.401407news0 auth[956]: pam_unix(dovecot:auth): authentication failure; logname= uid=0 euid=0 tty=dovecot ruser=admin rhost=37.49.230.238
...

Dovecot Invalid User Login Attempt.

"AmooT";tag=3533393765393339313363340132313832313335333935

\[2020-10-02 15:01:13\] SECURITY\[6939\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-10-02T15:01:13.624+0200",Severity="Error",Service="SIP",EventVersion="2",AccountID="100",SessionID="0x7f0ffea08d88",LocalAddress="IPV4/UDP/204.8.216.89/5060",RemoteAddress="IPV4/UDP/37.49.230.126/5862",Challenge="096f171f",ReceivedChallenge="096f171f",ReceivedHash="b099bdfad5869da4ae2114a56a2b4299"
\[2020-10-02 15:01:13\] SECURITY\[6939\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-10-02T15:01:13.759+0200",Severity="Error",Service="SIP",EventVersion="2",AccountID="100",SessionID="0x7f0ffeab8148",LocalAddress="IPV4/UDP/204.8.216.89/5060",RemoteAddress="IPV4/UDP/37.49.230.126/5862",Challenge="233a417c",ReceivedChallenge="233a417c",ReceivedHash="0017581d14759d4b5ad3a404ed924131"
\[2020-10-02 15:01:13\] SECURITY\[6939\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-10-02T15:01:13.783+0200",Severity="Error",Service="SIP",EventVersion="2",Accoun
...

\[2020-10-02 15:01:13\] SECURITY\[6939\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-10-02T15:01:13.624+0200",Severity="Error",Service="SIP",EventVersion="2",AccountID="100",SessionID="0x7f0ffea08d88",LocalAddress="IPV4/UDP/204.8.216.89/5060",RemoteAddress="IPV4/UDP/37.49.230.126/5862",Challenge="096f171f",ReceivedChallenge="096f171f",ReceivedHash="b099bdfad5869da4ae2114a56a2b4299"
\[2020-10-02 15:01:13\] SECURITY\[6939\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-10-02T15:01:13.759+0200",Severity="Error",Service="SIP",EventVersion="2",AccountID="100",SessionID="0x7f0ffeab8148",LocalAddress="IPV4/UDP/204.8.216.89/5060",RemoteAddress="IPV4/UDP/37.49.230.126/5862",Challenge="233a417c",ReceivedChallenge="233a417c",ReceivedHash="0017581d14759d4b5ad3a404ed924131"
\[2020-10-02 15:01:13\] SECURITY\[6939\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-10-02T15:01:13.783+0200",Severity="Error",Service="SIP",EventVersion="2",Accoun
...

[N1.H1.VM1] Port Scanner Detected Blocked by UFW

SIP Server BruteForce Attack

[2020-09-30 18:00:12] NOTICE[1159][C-0000421d] chan_sip.c: Call from '' (37.49.230.201:64644) to extension '12526890745' rejected because extension not found in context 'public'.
[2020-09-30 18:00:12] SECURITY[1198] res_security_log.c: SecurityEvent="FailedACL",EventTV="2020-09-30T18:00:12.866-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="12526890745",SessionID="0x7fcaa045f8f8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/37.49.230.201/64644",ACLName="no_extension_match"
[2020-09-30 18:00:26] NOTICE[1159][C-0000421f] chan_sip.c: Call from '' (37.49.230.201:57391) to extension '712526890745' rejected because extension not found in context 'public'.
[2020-09-30 18:00:26] SECURITY[1198] res_security_log.c: SecurityEvent="FailedACL",EventTV="2020-09-30T18:00:26.237-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="712526890745",SessionID="0x7fcaa04d8d08",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/37.49.230.201/
...

[2020-09-30 18:00:12] NOTICE[1159][C-0000421d] chan_sip.c: Call from '' (37.49.230.201:64644) to extension '12526890745' rejected because extension not found in context 'public'.
[2020-09-30 18:00:12] SECURITY[1198] res_security_log.c: SecurityEvent="FailedACL",EventTV="2020-09-30T18:00:12.866-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="12526890745",SessionID="0x7fcaa045f8f8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/37.49.230.201/64644",ACLName="no_extension_match"
[2020-09-30 18:00:26] NOTICE[1159][C-0000421f] chan_sip.c: Call from '' (37.49.230.201:57391) to extension '712526890745' rejected because extension not found in context 'public'.
[2020-09-30 18:00:26] SECURITY[1198] res_security_log.c: SecurityEvent="FailedACL",EventTV="2020-09-30T18:00:26.237-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="712526890745",SessionID="0x7fcaa04d8d08",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/37.49.230.201/
...

[2020-09-30 18:00:12] NOTICE[1159][C-0000421d] chan_sip.c: Call from '' (37.49.230.201:64644) to extension '12526890745' rejected because extension not found in context 'public'.
[2020-09-30 18:00:12] SECURITY[1198] res_security_log.c: SecurityEvent="FailedACL",EventTV="2020-09-30T18:00:12.866-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="12526890745",SessionID="0x7fcaa045f8f8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/37.49.230.201/64644",ACLName="no_extension_match"
[2020-09-30 18:00:26] NOTICE[1159][C-0000421f] chan_sip.c: Call from '' (37.49.230.201:57391) to extension '712526890745' rejected because extension not found in context 'public'.
[2020-09-30 18:00:26] SECURITY[1198] res_security_log.c: SecurityEvent="FailedACL",EventTV="2020-09-30T18:00:26.237-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="712526890745",SessionID="0x7fcaa04d8d08",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/37.49.230.201/
...

Hellooo

Hellooo

Sep 28 15:49:19 : SSH login attempts with invalid user

Port scan: Attack repeated for 24 hours

Apr 18 01:52:38 web1 sshd\[30126\]: Invalid user admin from 125.91.32.65
Apr 18 01:52:38 web1 sshd\[30126\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=125.91.32.65
Apr 18 01:52:40 web1 sshd\[30126\]: Failed password for invalid user admin from 125.91.32.65 port 13229 ssh2
Apr 18 01:59:54 web1 sshd\[30808\]: Invalid user xx from 125.91.32.65
Apr 18 01:59:54 web1 sshd\[30808\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=125.91.32.65

Port probing on unauthorized port 1433

Apr 18 15:08:23 ws26vmsma01 sshd[221327]: Failed password for root from 1.236.151.31 port 54056 ssh2
...

Apr 18 17:43:06 vps647732 sshd[13219]: Failed password for root from 115.124.68.162 port 51884 ssh2
Apr 18 17:48:42 vps647732 sshd[13273]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=115.124.68.162
...

Apr 18 10:22:58 server1 sshd\[478\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.12.55.170  user=root
Apr 18 10:23:00 server1 sshd\[478\]: Failed password for root from 106.12.55.170 port 56912 ssh2
Apr 18 10:28:40 server1 sshd\[2334\]: Invalid user zs from 106.12.55.170
Apr 18 10:28:40 server1 sshd\[2334\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.12.55.170 
Apr 18 10:28:42 server1 sshd\[2334\]: Failed password for invalid user zs from 106.12.55.170 port 33784 ssh2
...

2020-04-18T11:33:17.7660611495-001 sshd[40754]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=119.28.158.212
2020-04-18T11:33:17.7629991495-001 sshd[40754]: Invalid user yl from 119.28.158.212 port 41306
2020-04-18T11:33:20.3954541495-001 sshd[40754]: Failed password for invalid user yl from 119.28.158.212 port 41306 ssh2
2020-04-18T11:38:12.4877161495-001 sshd[40997]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=119.28.158.212  user=root
2020-04-18T11:38:14.6157761495-001 sshd[40997]: Failed password for root from 119.28.158.212 port 37884 ssh2
2020-04-18T11:43:08.1262331495-001 sshd[41258]: Invalid user pa from 119.28.158.212 port 34458
...

2020-04-18T14:27:53.256916abusebot-3.cloudsearch.cf sshd[18097]: Invalid user postgres from 51.75.207.61 port 56998
2020-04-18T14:27:53.264238abusebot-3.cloudsearch.cf sshd[18097]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=61.ip-51-75-207.eu
2020-04-18T14:27:53.256916abusebot-3.cloudsearch.cf sshd[18097]: Invalid user postgres from 51.75.207.61 port 56998
2020-04-18T14:27:55.535758abusebot-3.cloudsearch.cf sshd[18097]: Failed password for invalid user postgres from 51.75.207.61 port 56998 ssh2
2020-04-18T14:32:16.064212abusebot-3.cloudsearch.cf sshd[18448]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=61.ip-51-75-207.eu  user=root
2020-04-18T14:32:18.105006abusebot-3.cloudsearch.cf sshd[18448]: Failed password for root from 51.75.207.61 port 46792 ssh2
2020-04-18T14:36:36.131153abusebot-3.cloudsearch.cf sshd[18736]: Invalid user hs from 51.75.207.61 port 36586
...

SSH Brute-Force attacks

Port probing on unauthorized port 13907

Brute Force

Apr 18 16:23:34 pi sshd[12984]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=89.248.168.229  user=root
Apr 18 16:23:37 pi sshd[12984]: Failed password for invalid user root from 89.248.168.229 port 55894 ssh2

Apr 18 12:50:13 vps46666688 sshd[22545]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=190.145.224.18
Apr 18 12:50:13 vps46666688 sshd[22545]: Failed password for invalid user xk from 190.145.224.18 port 43488 ssh2
...

Apr 18 15:26:10 ns382633 sshd\[21675\]: Invalid user oracle from 157.245.104.96 port 41784
Apr 18 15:26:10 ns382633 sshd\[21675\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=157.245.104.96
Apr 18 15:26:12 ns382633 sshd\[21675\]: Failed password for invalid user oracle from 157.245.104.96 port 41784 ssh2
Apr 18 15:26:13 ns382633 sshd\[21679\]: Invalid user test from 157.245.104.96 port 42842
Apr 18 15:26:13 ns382633 sshd\[21679\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=157.245.104.96

Apr 18 11:13:13 XXXXXX sshd[44805]: Invalid user oracle from 51.15.194.51 port 48328