May 15 00:50:38 mail.srvfarm.net postfix/smtpd[1504621]: warning: unknown[141.98.80.48]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
May 15 00:50:38 mail.srvfarm.net postfix/smtpd[1504621]: lost connection after AUTH from unknown[141.98.80.48]
May 15 00:50:42 mail.srvfarm.net postfix/smtpd[1503857]: lost connection after AUTH from unknown[141.98.80.48]
May 15 00:50:47 mail.srvfarm.net postfix/smtpd[1504619]: lost connection after AUTH from unknown[141.98.80.48]
May 15 00:50:48 mail.srvfarm.net postfix/smtpd[1504628]: lost connection after AUTH from unknown[141.98.80.48]

May 14 19:45:41 mail.srvfarm.net postfix/smtpd[1267165]: warning: unknown[141.98.80.48]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
May 14 19:45:41 mail.srvfarm.net postfix/smtpd[1267165]: lost connection after AUTH from unknown[141.98.80.48]
May 14 19:45:47 mail.srvfarm.net postfix/smtpd[1266192]: warning: unknown[141.98.80.48]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
May 14 19:45:47 mail.srvfarm.net postfix/smtpd[1266191]: warning: unknown[141.98.80.48]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
May 14 19:45:47 mail.srvfarm.net postfix/smtpd[1266482]: warning: unknown[141.98.80.48]: SASL LOGIN authentication failed: UGFzc3dvcmQ6

May-14-20 09:44:37 [Worker_1] 141.98.80.48 [SMTP Error] 535 5.7.8 Error: authentication failed: PDkzODMyMTE2NTY1NjM0OTQuMTU4OTQ0OTQ3M0BqYW5lLnRoZS1raW5nZG9tLm5ldD4=
May-14-20 09:44:55 [Worker_1] 141.98.80.48 [SMTP Error] 535 5.7.8 Error: authentication failed: PDc2MzQ1ODg0MzE4MzMzMTYuMTU4OTQ0OTQ5MUBqYW5lLnRoZS1raW5nZG9tLm5ldD4=
May-14-20 09:50:15 [Worker_1] 141.98.80.48 [SMTP Error] 535 5.7.8 Error: authentication failed: PDM2MjUwOTg4Nzc3NDI5MDMuMTU4OTQ0OTgxMkBqYW5lLnRoZS1raW5nZG9tLm5ldD4=
May-14-20 09:50:32 [Worker_1] 141.98.80.48 [SMTP Error] 535 5.7.8 Error: authentication failed: PDMyNDUwOTI2NjE2NjY0NDguMTU4OTQ0OTgyOUBqYW5lLnRoZS1raW5nZG9tLm5ldD4=
May-14-20 10:29:54 [Worker_1] 141.98.80.48 [SMTP Error] 535 5.7.8 Error: authentication failed: PDQ0MzcwMDY3NTE1NTc5NjcuMTU4OTQ1MjE5MkBqYW5lLnRoZS1raW5nZG9tLm5ldD4=
...

f2b trigger Multiple SASL failures

May 11 18:45:05 relay postfix/smtpd\[15911\]: warning: unknown\[141.98.80.48\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
May 11 18:45:22 relay postfix/smtpd\[8437\]: warning: unknown\[141.98.80.48\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
May 11 19:02:50 relay postfix/smtpd\[22635\]: warning: unknown\[141.98.80.48\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
May 11 19:03:08 relay postfix/smtpd\[15911\]: warning: unknown\[141.98.80.48\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
May 11 19:04:03 relay postfix/smtpd\[15911\]: warning: unknown\[141.98.80.48\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
May 11 19:04:03 relay postfix/smtpd\[22020\]: warning: unknown\[141.98.80.48\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

May  9 22:38:40 relay postfix/smtpd\[11214\]: warning: unknown\[141.98.80.48\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
May  9 22:38:58 relay postfix/smtpd\[11214\]: warning: unknown\[141.98.80.48\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
May  9 22:39:20 relay postfix/smtpd\[11214\]: warning: unknown\[141.98.80.48\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
May  9 22:39:38 relay postfix/smtpd\[11214\]: warning: unknown\[141.98.80.48\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
May  9 22:47:40 relay postfix/smtpd\[11213\]: warning: unknown\[141.98.80.48\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

May  7 14:28:04 web01.agentur-b-2.de postfix/smtpd[209995]: warning: unknown[141.98.80.48]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
May  7 14:28:04 web01.agentur-b-2.de postfix/smtpd[207257]: warning: unknown[141.98.80.48]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
May  7 14:28:04 web01.agentur-b-2.de postfix/smtpd[209995]: lost connection after AUTH from unknown[141.98.80.48]
May  7 14:28:04 web01.agentur-b-2.de postfix/smtpd[207257]: lost connection after AUTH from unknown[141.98.80.48]
May  7 14:28:09 web01.agentur-b-2.de postfix/smtpd[206928]: lost connection after AUTH from unknown[141.98.80.48]
May  7 14:28:09 web01.agentur-b-2.de postfix/smtpd[209995]: lost connection after AUTH from unknown[141.98.80.48]

May  6 10:16:24 mail.srvfarm.net postfix/smtpd[237959]: warning: unknown[141.98.80.48]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
May  6 10:16:24 mail.srvfarm.net postfix/smtpd[237959]: lost connection after AUTH from unknown[141.98.80.48]
May  6 10:16:29 mail.srvfarm.net postfix/smtpd[238454]: lost connection after AUTH from unknown[141.98.80.48]
May  6 10:16:34 mail.srvfarm.net postfix/smtpd[238457]: lost connection after AUTH from unknown[141.98.80.48]
May  6 10:16:38 mail.srvfarm.net postfix/smtpd[224026]: lost connection after AUTH from unknown[141.98.80.48]

Oct 13 20:36:42 mail postfix/smtpd\[2755\]: warning: unknown\[141.98.80.73\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Oct 13 21:07:45 mail postfix/smtpd\[3739\]: warning: unknown\[141.98.80.73\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Oct 13 21:08:05 mail postfix/smtpd\[3743\]: warning: unknown\[141.98.80.73\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Oct 13 21:08:21 mail postfix/smtpd\[3743\]: warning: unknown\[141.98.80.73\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\

Oct 13 12:10:32 mail postfix/smtpd\[17486\]: warning: unknown\[141.98.80.73\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Oct 13 12:10:52 mail postfix/smtpd\[17603\]: warning: unknown\[141.98.80.73\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Oct 13 12:11:11 mail postfix/smtpd\[17486\]: warning: unknown\[141.98.80.73\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Oct 13 12:42:04 mail postfix/smtpd\[18268\]: warning: unknown\[141.98.80.73\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\

2020-10-11 20:00:28 dovecot_login authenticator failed for \(\[141.98.80.72\]\) \[141.98.80.72\]: 535 Incorrect authentication data \(set_id=ben@benjaminhauck.com\)
2020-10-11 20:00:36 dovecot_login authenticator failed for \(\[141.98.80.72\]\) \[141.98.80.72\]: 535 Incorrect authentication data
2020-10-11 20:00:45 dovecot_login authenticator failed for \(\[141.98.80.72\]\) \[141.98.80.72\]: 535 Incorrect authentication data
2020-10-11 20:00:51 dovecot_login authenticator failed for \(\[141.98.80.72\]\) \[141.98.80.72\]: 535 Incorrect authentication data
2020-10-11 20:01:03 dovecot_login authenticator failed for \(\[141.98.80.72\]\) \[141.98.80.72\]: 535 Incorrect authentication data
...

Fail2Ban Ban Triggered

Brute Force attack - banned by Fail2Ban

[H1.VM1] Blocked by UFW

port scan hacking

Tried to scan TCP Port but the Antivirus refused. More than 20 times within a few months.

\x03 400 0 "-" "-"

Found on   Binary Defense     / proto=6  .  srcport=65528  .  dstport=53 DNS  .     (757)

Exim brute force attack (multiple auth failures).

UTC 10/08/2020 18:12:24 - 83 - Security Services - Alert - 141.98.80.22, 65534, X1 - xxx.xxx.xxx.xxx, 8651, X1 - tcp - TCP scanned port list, 8691, 8611, 8671, 8601, 8661, 8641, 8681, 8631, 8621, 8651 - Probable port scan detected

Oct  8 17:35:05 relay postfix/smtpd\[8860\]: warning: unknown\[141.98.80.190\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Oct  8 17:35:26 relay postfix/smtpd\[4144\]: warning: unknown\[141.98.80.190\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Oct  8 17:40:26 relay postfix/smtpd\[5072\]: warning: unknown\[141.98.80.190\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Oct  8 17:40:45 relay postfix/smtpd\[4145\]: warning: unknown\[141.98.80.190\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Oct  8 17:46:12 relay postfix/smtpd\[8861\]: warning: unknown\[141.98.80.190\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

scans 10 times in preceeding hours on the ports (in chronological order) 8601 8611 8621 8631 8641 8651 8661 8671 8681 8691

tcp port scan

2020-05-03T05:45:01.704430MailD postfix/smtpd[20140]: warning: unknown[45.148.10.160]: SASL LOGIN authentication failed: authentication failure
2020-05-03T09:15:50.538362MailD postfix/smtpd[2341]: warning: unknown[45.148.10.160]: SASL LOGIN authentication failed: authentication failure
2020-05-03T09:15:50.621304MailD postfix/smtpd[2341]: warning: unknown[45.148.10.160]: SASL LOGIN authentication failed: authentication failure
2020-05-03T09:15:50.716842MailD postfix/smtpd[2341]: warning: unknown[45.148.10.160]: SASL LOGIN authentication failed: authentication failure

May  3 09:35:25 piServer sshd[14655]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=170.150.72.28 
May  3 09:35:27 piServer sshd[14655]: Failed password for invalid user justin from 170.150.72.28 port 50322 ssh2
May  3 09:40:17 piServer sshd[15236]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=170.150.72.28 
...

ssh intrusion attempt

2020-05-03T05:00:14.374906shield sshd\[25715\]: Invalid user vmm from 119.65.195.190 port 47508
2020-05-03T05:00:14.378535shield sshd\[25715\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=119.65.195.190
2020-05-03T05:00:16.165956shield sshd\[25715\]: Failed password for invalid user vmm from 119.65.195.190 port 47508 ssh2
2020-05-03T05:04:53.218350shield sshd\[26408\]: Invalid user df from 119.65.195.190 port 59244
2020-05-03T05:04:53.221896shield sshd\[26408\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=119.65.195.190

Time:     Sun May  3 00:32:08 2020 -0300
IP:       54.36.197.5 (FR/France/ip5.ip-54-36-197.eu)
Failures: 5 (mod_security)
Interval: 3600 seconds
Blocked:  Permanent Block

Invalid user ella from 120.31.143.254 port 40708

Invalid user jw from 81.4.100.188 port 35836

May  3 07:18:57 pornomens sshd\[2458\]: Invalid user uwsgi from 185.204.3.36 port 60408
May  3 07:18:57 pornomens sshd\[2458\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=185.204.3.36
May  3 07:18:58 pornomens sshd\[2458\]: Failed password for invalid user uwsgi from 185.204.3.36 port 60408 ssh2
...

148.72.31.117 - - [03/May/2020:09:41:05 +0200] "GET /wp-login.php HTTP/1.1" 200 5702 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:62.0) Gecko/20100101 Firefox/62.0"
148.72.31.117 - - [03/May/2020:09:41:06 +0200] "POST /wp-login.php HTTP/1.1" 200 5953 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:62.0) Gecko/20100101 Firefox/62.0"
148.72.31.117 - - [03/May/2020:09:41:07 +0200] "POST /xmlrpc.php HTTP/1.1" 200 427 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:62.0) Gecko/20100101 Firefox/62.0"

<6 unauthorized SSH connections

SSH/22 MH Probe, BF, Hack -

May  3 06:51:55 elektron postfix/smtpd\[32101\]: NOQUEUE: reject: RCPT from unknown\[114.234.4.229\]: 450 4.7.1 Client host rejected: cannot find your hostname, \[114.234.4.229\]\; from=\ to=\ proto=ESMTP helo=\
May  3 06:52:42 elektron postfix/smtpd\[1965\]: NOQUEUE: reject: RCPT from unknown\[114.234.4.229\]: 450 4.7.1 Client host rejected: cannot find your hostname, \[114.234.4.229\]\; from=\ to=\ proto=ESMTP helo=\
May  3 06:53:29 elektron postfix/smtpd\[32101\]: NOQUEUE: reject: RCPT from unknown\[114.234.4.229\]: 450 4.7.1 Client host rejected: cannot find your hostname, \[114.234.4.229\]\; from=\ to=\ proto=ESMTP helo=\
May  3 06:54:14 elektron postfix/smtpd\[1965\]: NOQUEUE: reject: RCPT from unknown\[114.234.4.229\]: 450 4.7.1 Client host rejected: cannot find your hostname, \[114.234.4.229\]\; from=\ to=\ proto=ESMTP helo=\

May  3 06:56:56 srv-ubuntu-dev3 sshd[103454]: Invalid user xbox from 152.136.219.175
May  3 06:56:56 srv-ubuntu-dev3 sshd[103454]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=152.136.219.175
May  3 06:56:56 srv-ubuntu-dev3 sshd[103454]: Invalid user xbox from 152.136.219.175
May  3 06:56:58 srv-ubuntu-dev3 sshd[103454]: Failed password for invalid user xbox from 152.136.219.175 port 56294 ssh2
May  3 07:03:08 srv-ubuntu-dev3 sshd[104376]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=152.136.219.175  user=root
May  3 07:03:09 srv-ubuntu-dev3 sshd[104376]: Failed password for root from 152.136.219.175 port 53164 ssh2
May  3 07:06:13 srv-ubuntu-dev3 sshd[104861]: Invalid user sas from 152.136.219.175
...

Invalid user user from 114.67.69.200 port 34016

Port probing on unauthorized port 23