Jul 31 01:46:09 mail.srvfarm.net postfix/smtpd[90051]: warning: unknown[141.98.80.54]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 31 01:46:09 mail.srvfarm.net postfix/smtpd[90037]: warning: unknown[141.98.80.54]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 31 01:46:09 mail.srvfarm.net postfix/smtpd[90051]: lost connection after AUTH from unknown[141.98.80.54]
Jul 31 01:46:09 mail.srvfarm.net postfix/smtpd[90037]: lost connection after AUTH from unknown[141.98.80.54]
Jul 31 01:46:12 mail.srvfarm.net postfix/smtpd[90054]: lost connection after AUTH from unknown[141.98.80.54]

spam (f2b h2)

Jul 30 11:38:59 relay postfix/smtpd\[17294\]: warning: unknown\[141.98.80.54\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 30 11:39:17 relay postfix/smtpd\[4055\]: warning: unknown\[141.98.80.54\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 30 11:41:21 relay postfix/smtpd\[17294\]: warning: unknown\[141.98.80.54\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 30 11:41:40 relay postfix/smtpd\[17293\]: warning: unknown\[141.98.80.54\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 30 11:43:31 relay postfix/smtpd\[19885\]: warning: unknown\[141.98.80.54\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

Jul 27 02:03:23 mail.srvfarm.net postfix/smtps/smtpd[1616333]: warning: unknown[141.98.80.54]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 27 02:03:23 mail.srvfarm.net postfix/smtps/smtpd[1616333]: lost connection after AUTH from unknown[141.98.80.54]
Jul 27 02:03:29 mail.srvfarm.net postfix/smtps/smtpd[1616536]: lost connection after AUTH from unknown[141.98.80.54]
Jul 27 02:03:30 mail.srvfarm.net postfix/smtps/smtpd[1617816]: lost connection after AUTH from unknown[141.98.80.54]
Jul 27 02:03:35 mail.srvfarm.net postfix/smtps/smtpd[1617814]: lost connection after AUTH from unknown[141.98.80.54]

2020-07-26 06:12:30 dovecot_login authenticator failed for \(\[141.98.80.54\]\) \[141.98.80.54\]: 535 Incorrect authentication data \(set_id=info@jugend-ohne-grenzen.net\)
2020-07-26 06:12:37 dovecot_login authenticator failed for \(\[141.98.80.54\]\) \[141.98.80.54\]: 535 Incorrect authentication data
2020-07-26 06:12:46 dovecot_login authenticator failed for \(\[141.98.80.54\]\) \[141.98.80.54\]: 535 Incorrect authentication data
2020-07-26 06:12:50 dovecot_login authenticator failed for \(\[141.98.80.54\]\) \[141.98.80.54\]: 535 Incorrect authentication data
2020-07-26 06:13:02 dovecot_login authenticator failed for \(\[141.98.80.54\]\) \[141.98.80.54\]: 535 Incorrect authentication data
2020-07-26 06:13:07 dovecot_login authenticator failed for \(\[141.98.80.54\]\) \[141.98.80.54\]: 535 Incorrect authentication data
2020-07-26 06:13:11 dovecot_login authenticator failed for \(\[141.98.80.54\]\) \[141.98.80.54\]: 535 Incorrect authentication data
2020-07-26 06:13:16 dovecot_login au
...

Time:     Fri Jun 28 19:20:21 2019 -0400
IP:       141.98.80.54 (PA/Panama/-)
Failures: 5 (smtpauth)
Interval: 3600 seconds
Blocked:  Permanent Block

'IP reached maximum auth failures for a one day block'

Jun 27 01:54:47 mail postfix/smtpd\[18755\]: warning: unknown\[141.98.80.54\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 27 01:54:58 mail postfix/smtpd\[18755\]: warning: unknown\[141.98.80.54\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 27 02:05:43 mail postfix/smtpd\[18548\]: warning: unknown\[141.98.80.54\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6

Jun 25 21:14:04 mail postfix/smtpd\[28328\]: warning: unknown\[141.98.80.54\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 25 21:14:29 mail postfix/smtpd\[29597\]: warning: unknown\[141.98.80.54\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 25 21:14:59 mail postfix/smtpd\[28328\]: warning: unknown\[141.98.80.54\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6

2019-06-24 14:06:35 dovecot_login authenticator failed for \(\[141.98.80.54\]\) \[141.98.80.54\]: 535 Incorrect authentication data \(set_id=no-reply@opso.it\)
2019-06-24 14:06:47 dovecot_login authenticator failed for \(\[141.98.80.54\]\) \[141.98.80.54\]: 535 Incorrect authentication data \(set_id=no-reply\)
2019-06-24 14:11:23 dovecot_login authenticator failed for \(\[141.98.80.54\]\) \[141.98.80.54\]: 535 Incorrect authentication data \(set_id=no-reply@opso.it\)
2019-06-24 14:11:40 dovecot_login authenticator failed for \(\[141.98.80.54\]\) \[141.98.80.54\]: 535 Incorrect authentication data \(set_id=no-reply\)
2019-06-24 14:15:49 dovecot_login authenticator failed for \(\[141.98.80.54\]\) \[141.98.80.54\]: 535 Incorrect authentication data \(set_id=sales@opso.it\)

Jun 23 23:57:38 mail postfix/smtpd\[7782\]: warning: unknown\[141.98.80.54\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Jun 24 00:39:17 mail postfix/smtpd\[8813\]: warning: unknown\[141.98.80.54\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Jun 24 00:39:25 mail postfix/smtpd\[8813\]: warning: unknown\[141.98.80.54\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Jun 24 00:44:32 mail postfix/smtpd\[8956\]: warning: unknown\[141.98.80.54\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\

Jun 22 21:17:01 mail postfix/smtpd[22544]: warning: unknown[141.98.80.54]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 22 21:17:12 mail postfix/smtpd[22544]: warning: unknown[141.98.80.54]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 22 21:24:31 mail postfix/smtpd[22559]: warning: unknown[141.98.80.54]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

dovecot jail smtp auth [ti]

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

Bruteforce detected by fail2ban

Port probing on unauthorized port 9530

2020-08-05T18:52:51.0630121495-001 sshd[56220]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=190.145.12.233  user=root
2020-08-05T18:52:53.1728061495-001 sshd[56220]: Failed password for root from 190.145.12.233 port 44386 ssh2
2020-08-05T18:55:42.9418021495-001 sshd[56392]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=190.145.12.233  user=root
2020-08-05T18:55:45.5277231495-001 sshd[56392]: Failed password for root from 190.145.12.233 port 34682 ssh2
2020-08-05T18:58:33.7769341495-001 sshd[56481]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=190.145.12.233  user=root
2020-08-05T18:58:35.8361521495-001 sshd[56481]: Failed password for root from 190.145.12.233 port 53208 ssh2
...

prod6
...

Port probing on unauthorized port 445

Scanned 3 times in the last 24 hours on port 22

2020-08-05T23:32:36.916486snf-827550 sshd[17522]: Failed password for root from 178.128.15.57 port 60028 ssh2
2020-08-05T23:36:48.718861snf-827550 sshd[17554]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=178.128.15.57  user=root
2020-08-05T23:36:50.860030snf-827550 sshd[17554]: Failed password for root from 178.128.15.57 port 45706 ssh2
...

2020-08-05T22:35:54.311037+02:00  sshd[4166]: Failed password for root from 191.234.173.131 port 59076 ssh2

 TCP (SYN) 81.213.59.71:17670 -> port 23, len 44

Aug  6 00:36:05 buvik sshd[11182]: Failed password for root from 187.176.185.65 port 43736 ssh2
Aug  6 00:40:19 buvik sshd[11829]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=187.176.185.65  user=root
Aug  6 00:40:20 buvik sshd[11829]: Failed password for root from 187.176.185.65 port 54354 ssh2
...

2020-08-06T00:01:09.030318shield sshd\[24667\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.42.213  user=root
2020-08-06T00:01:11.254533shield sshd\[24667\]: Failed password for root from 222.186.42.213 port 37217 ssh2
2020-08-06T00:01:13.825302shield sshd\[24667\]: Failed password for root from 222.186.42.213 port 37217 ssh2
2020-08-06T00:01:15.800929shield sshd\[24667\]: Failed password for root from 222.186.42.213 port 37217 ssh2
2020-08-06T00:01:18.833304shield sshd\[24743\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.42.213  user=root

1596659774 - 08/05/2020 22:36:14 Host: 189.240.192.226/189.240.192.226 Port: 445 TCP Blocked

Aug  6 02:05:23 minden010 sshd[27760]: Failed password for root from 112.85.42.104 port 58304 ssh2
Aug  6 02:05:31 minden010 sshd[27760]: Failed password for root from 112.85.42.104 port 58304 ssh2
Aug  6 02:05:33 minden010 sshd[27760]: Failed password for root from 112.85.42.104 port 58304 ssh2
...

Aug  6 00:03:33 *** sshd[11543]: User root from 178.62.49.137 not allowed because not listed in AllowUsers

firewall-block, port(s): 9578/tcp