Sep 10 23:44:22 lenivpn01 kernel: \[384666.430361\] \[UFW BLOCK\] IN=eth0 OUT= MAC=96:00:00:2f:6c:1b:d2:74:7f:6e:37:e3:08:00 SRC=37.49.230.216 DST=195.201.121.15 LEN=40 TOS=0x00 PREC=0x00 TTL=247 ID=54321 PROTO=TCP SPT=43835 DPT=81 WINDOW=65535 RES=0x00 SYN URGP=0 
Sep 11 06:58:31 lenivpn01 kernel: \[410714.269318\] \[UFW BLOCK\] IN=eth0 OUT= MAC=96:00:00:2f:6c:1b:d2:74:7f:6e:37:e3:08:00 SRC=37.49.230.216 DST=195.201.121.15 LEN=40 TOS=0x00 PREC=0x00 TTL=247 ID=54321 PROTO=TCP SPT=54372 DPT=81 WINDOW=65535 RES=0x00 SYN URGP=0 
Sep 11 15:54:54 lenivpn01 kernel: \[442896.761590\] \[UFW BLOCK\] IN=eth0 OUT= MAC=96:00:00:2f:6c:1b:d2:74:7f:6e:37:e3:08:00 SRC=37.49.230.216 DST=195.201.121.15 LEN=40 TOS=0x00 PREC=0x00 TTL=247 ID=54321 PROTO=TCP SPT=53922 DPT=81 WINDOW=65535 RES=0x00 SYN URGP=0 
...

Scanning random ports - tries to find possible vulnerable services

Splunk® : port scan detected:
Aug 25 23:29:08 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=37.49.230.216 DST=104.248.11.191 LEN=40 TOS=0x00 PREC=0x00 TTL=241 ID=54321 PROTO=TCP SPT=40071 DPT=81 WINDOW=65535 RES=0x00 SYN URGP=0

Honeypot attack, port: 81, PTR: PTR record not found

81/tcp 389/udp...
[2019-07-01/22]195pkt,1pt.(tcp),1pt.(udp)

Port scan attempt detected by AWS-CCS, CTS, India

Jul 19 14:41:32 box kernel: [1654718.030115] [UFW BLOCK] IN=eth0 OUT= MAC=[munged] SRC=37.49.230.216 DST=[munged] LEN=40 TOS=0x08 PREC=0x20 TTL=247 ID=54321 PROTO=TCP SPT=41155 DPT=81 WINDOW=65535 RES=0x00 SYN URGP=0 
Jul 19 15:06:50 box kernel: [1656235.459750] [UFW BLOCK] IN=eth0 OUT= MAC=[munged] SRC=37.49.230.216 DST=[munged] LEN=40 TOS=0x08 PREC=0x20 TTL=247 ID=54321 PROTO=TCP SPT=53987 DPT=81 WINDOW=65535 RES=0x00 SYN URGP=0 
Jul 19 18:48:48 box kernel: [1669553.300839] [UFW BLOCK] IN=eth0 OUT= MAC=[munged] SRC=37.49.230.216 DST=[munged] LEN=40 TOS=0x08 PREC=0x20 TTL=247 ID=54321 PROTO=TCP SPT=35036 DPT=81 WINDOW=65535 RES=0x00 SYN URGP=0 
Jul 19 23:40:58 box kernel: [1687083.624111] [UFW BLOCK] IN=eth0 OUT= MAC=[munged] SRC=37.49.230.216 DST=[munged] LEN=40 TOS=0x08 PREC=0x20 TTL=247 ID=54321 PROTO=TCP SPT=39019 DPT=81 WINDOW=65535 RES=0x00 SYN URGP=0 
Jul 20 01:26:15 box kernel: [1693400.326638] [UFW BLOCK] IN=eth0 OUT= MAC=[munged] SRC=37.49.230.216 DST=[munged] LEN=40 TOS=0x08 PREC=0x20 TTL=247 ID=

07.07.2019 03:47:17 Connection to port 81 blocked by firewall

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

Automatic report - Banned IP Access

Jul 18 09:28:23 * sshd[27782]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=178.128.158.113
Jul 18 09:28:25 * sshd[27782]: Failed password for invalid user ron from 178.128.158.113 port 47370 ssh2

Jul 17 07:21:23 our-server-hostname postfix/smtpd[4122]: connect from unknown[113.182.123.109]
Jul 17 07:21:24 our-server-hostname postfix/smtpd[4122]: NOQUEUE: reject: RCPT from unknown[113.182.123.109]: 504 5.5.2 : Helo command rejected: need fully-qualified hostname; from=x@x helo=
Jul 17 07:21:25 our-server-hostname postfix/smtpd[4122]: NOQUEUE: reject: RCPT from unknown[113.182.123.109]: 504 5.5.2 : Helo command rejected: need fully-qualified hostname; from=x@x helo=
Jul 17 07:21:25 our-server-hostname postfix/smtpd[4122]: NOQUEUE: reject: RCPT from unknown[113.182.123.109]: 504 5.5.2 : Helo command rejected: need fully-qualified hostname; from=x@x helo=
Jul 17 07:21:26 our-server-hostname postfix/smtpd[4122]: NOQUEUE: reject: RCPT from unknown[113.182.123.109]: 504 5.5.2 : Helo command rejected: need fully-qualified hostname; from=x@x helo=
Jul 17 07:21:26 our-server-hostname postfix/smtpd[4122]: NOQUEUE: rej........
-------------------------------

port scan and connect, tcp 80 (http)

Caught in portsentry honeypot

210.195.67.96 - - [18/Jul/2019:03:14:37 +0200] "GET /xmlrpc.php HTTP/1.1" 302 569
...

Jul 18 10:43:52 nextcloud sshd\[31232\]: Invalid user pinturabh from 189.125.2.234
Jul 18 10:43:52 nextcloud sshd\[31232\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=189.125.2.234
Jul 18 10:43:53 nextcloud sshd\[31232\]: Failed password for invalid user pinturabh from 189.125.2.234 port 36516 ssh2
...

Unauthorised access (Jul 18) SRC=180.246.148.49 LEN=52 TTL=116 ID=21911 DF TCP DPT=445 WINDOW=8192 SYN

email spam

1563412494 - 07/18/2019 03:14:54 Host: 69.70.217.54/69.70.217.54 Port: 143 TCP Blocked

Jul 17 09:56:55 gutwein sshd[20601]: Failed password for invalid user tmp from 52.178.199.25 port 32772 ssh2
Jul 17 09:56:55 gutwein sshd[20601]: Received disconnect from 52.178.199.25: 11: Bye Bye [preauth]
Jul 17 10:01:54 gutwein sshd[21527]: Failed password for invalid user lzhang from 52.178.199.25 port 60240 ssh2
Jul 17 10:01:54 gutwein sshd[21527]: Received disconnect from 52.178.199.25: 11: Bye Bye [preauth]
Jul 17 10:06:59 gutwein sshd[22471]: Failed password for invalid user stunnel from 52.178.199.25 port 59698 ssh2
Jul 17 10:06:59 gutwein sshd[22471]: Received disconnect from 52.178.199.25: 11: Bye Bye [preauth]
Jul 17 10:11:49 gutwein sshd[23360]: Failed password for invalid user luciana from 52.178.199.25 port 58914 ssh2
Jul 17 10:11:49 gutwein sshd[23360]: Received disconnect from 52.178.199.25: 11: Bye Bye [preauth]
Jul 17 10:16:57 gutwein sshd[24301]: Failed password for invalid user teamspeak3 from 52.178.199.25 port 58316 ssh2
Jul 17 10:16:57 gutwein s........
-------------------------------

6
2019-07-18 17:19:38
notice
Firewall
priority:1, from WAN to ANY, TCP, service others, REJECT [count=3]
103.138.109.197:60448
192.168.3.108:25
ACCESS BLOCK
7
2019-07-18 17:19:38
notice
Firewall
priority:1, from WAN to ANY, TCP, service others, REJECT [count=3]
103.138.109.197:60388
192.168.3.108:25
ACCESS BLOCK
8
2019-07-18 17:19:37
notice
Firewall
priority:1, from WAN to ANY, TCP, service others, REJECT [count=3]
103.138.109.197:60157
192.168.3.108:25
ACCESS BLOCK
9
2019-07-18 17:19:37
notice
Firewall
priority:1, from WAN to ANY, TCP, service others, REJECT [count=3]
103.138.109.197:60126
192.168.3.109:25
ACCESS BLOCK

Automatic report - Banned IP Access

proto=tcp  .  spt=45352  .  dpt=25  .     (listed on Blocklist de  Jul 17)     (91)

WordPress wp-login brute force :: 45.119.208.235 0.116 BYPASS [18/Jul/2019:11:14:08  1000] [censored_1] "POST /wp-login.php HTTP/1.1" 200 3972 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:62.0) Gecko/20100101 Firefox/62.0"