Jul 22 20:37:06 relay postfix/smtpd\[18887\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 22 20:37:25 relay postfix/smtpd\[19322\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 22 20:39:25 relay postfix/smtpd\[19450\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 22 20:39:38 relay postfix/smtpd\[19450\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 22 20:51:53 relay postfix/smtpd\[19448\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

Jul 20 16:24:10 relay postfix/smtpd\[10024\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 20 16:24:23 relay postfix/smtpd\[10023\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 20 16:25:15 relay postfix/smtpd\[13957\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 20 16:25:15 relay postfix/smtpd\[10022\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 20 16:27:31 relay postfix/smtpd\[10023\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 20 16:27:31 relay postfix/smtpd\[21844\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

Jul 20 06:59:53 srv01 postfix/smtpd\[4140\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 20 07:00:12 srv01 postfix/smtpd\[13594\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 20 07:03:09 srv01 postfix/smtpd\[15659\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 20 07:03:28 srv01 postfix/smtpd\[13594\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 20 07:03:45 srv01 postfix/smtpd\[15659\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 20 07:03:45 srv01 postfix/smtpd\[7825\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

Jul 19 17:03:39 l03 postfix/smtps/smtpd[26969]: warning: unknown[141.98.80.53]: SASL LOGIN authentication failed: authentication failure
Jul 19 17:03:44 l03 postfix/smtps/smtpd[26969]: warning: unknown[141.98.80.53]: SASL LOGIN authentication failed: authentication failure
Jul 19 17:09:42 l03 postfix/smtps/smtpd[27261]: warning: unknown[141.98.80.53]: SASL LOGIN authentication failed: authentication failure
Jul 19 17:09:47 l03 postfix/smtps/smtpd[27261]: warning: unknown[141.98.80.53]: SASL LOGIN authentication failed: authentication failure
...

Jul 19 11:01:36 srv01 postfix/smtpd\[27559\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 19 11:01:36 srv01 postfix/smtpd\[29404\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 19 11:01:55 srv01 postfix/smtpd\[29404\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 19 11:01:55 srv01 postfix/smtpd\[4036\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 19 11:03:16 srv01 postfix/smtpd\[4034\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

Jul 19 06:56:04 l03 postfix/smtps/smtpd[25755]: warning: unknown[141.98.80.53]: SASL LOGIN authentication failed: authentication failure
Jul 19 06:56:09 l03 postfix/smtps/smtpd[25755]: warning: unknown[141.98.80.53]: SASL LOGIN authentication failed: authentication failure
Jul 19 07:02:13 l03 postfix/smtps/smtpd[28319]: warning: unknown[141.98.80.53]: SASL LOGIN authentication failed: authentication failure
Jul 19 07:02:18 l03 postfix/smtps/smtpd[28319]: warning: unknown[141.98.80.53]: SASL LOGIN authentication failed: authentication failure
...

Jul 18 07:42:39 mail.srvfarm.net postfix/smtpd[2159254]: warning: unknown[141.98.80.53]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 18 07:42:39 mail.srvfarm.net postfix/smtpd[2159254]: lost connection after AUTH from unknown[141.98.80.53]
Jul 18 07:42:44 mail.srvfarm.net postfix/smtpd[2161831]: lost connection after AUTH from unknown[141.98.80.53]
Jul 18 07:42:49 mail.srvfarm.net postfix/smtpd[2162713]: lost connection after AUTH from unknown[141.98.80.53]
Jul 18 07:42:53 mail.srvfarm.net postfix/smtpd[2162208]: lost connection after AUTH from unknown[141.98.80.53]

Jul 17 08:02:59 relay postfix/smtpd\[15451\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 17 08:02:59 relay postfix/smtpd\[15450\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 17 08:05:28 relay postfix/smtpd\[15449\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 17 08:05:28 relay postfix/smtpd\[10206\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 17 08:07:54 relay postfix/smtpd\[10206\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 17 08:07:54 relay postfix/smtpd\[15450\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

Jul 16 19:31:03 relay postfix/smtpd\[9430\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 16 19:31:03 relay postfix/smtpd\[8413\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 16 19:33:35 relay postfix/smtpd\[8453\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 16 19:33:35 relay postfix/smtpd\[14245\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 16 19:36:17 relay postfix/smtpd\[14245\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 16 19:36:17 relay postfix/smtpd\[8413\]: warning: unknown\[141.98.80.53\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

Jul 16 03:00:33 mail.srvfarm.net postfix/smtpd[623944]: warning: unknown[141.98.80.53]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 16 03:00:33 mail.srvfarm.net postfix/smtpd[623944]: lost connection after AUTH from unknown[141.98.80.53]
Jul 16 03:00:38 mail.srvfarm.net postfix/smtpd[624210]: lost connection after AUTH from unknown[141.98.80.53]
Jul 16 03:00:43 mail.srvfarm.net postfix/smtpd[624216]: lost connection after AUTH from unknown[141.98.80.53]
Jul 16 03:00:49 mail.srvfarm.net postfix/smtpd[629743]: lost connection after AUTH from unknown[141.98.80.53]

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

Mar 16 09:57:55 minden010 sshd[14614]: Failed password for root from 222.186.173.215 port 47880 ssh2
Mar 16 09:58:05 minden010 sshd[14614]: Failed password for root from 222.186.173.215 port 47880 ssh2
Mar 16 09:58:09 minden010 sshd[14614]: Failed password for root from 222.186.173.215 port 47880 ssh2
Mar 16 09:58:09 minden010 sshd[14614]: error: maximum authentication attempts exceeded for root from 222.186.173.215 port 47880 ssh2 [preauth]
...

Mar 16 09:16:49 vmd17057 sshd[24186]: Failed password for root from 165.22.112.45 port 41970 ssh2
...

Honeypot attack, port: 5555, PTR: PTR record not found

firewall-block, port(s): 3788/tcp

Automatic report - XMLRPC Attack

Automatic report - Banned IP Access

from [212.88.109.66] (port=56764 helo=mail-20.srv.mtn.co.ug)
	by sg3plcpnl0224.prod.sin3.secureserver.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256)
	(Exim 4.92)
	(envelope-from )
	id 1jDfqc-00BjZk-BO; Sun, 15 Mar 2020 19:51:27 -0700

20/3/16@01:13:59: FAIL: Alarm-Network address from=157.51.239.247
20/3/16@01:13:59: FAIL: Alarm-Network address from=157.51.239.247
...

20 attempts against mh-misbehave-ban on pluto

Mar 15 19:48:38 web9 sshd\[21849\]: Invalid user adidas from 41.223.4.155
Mar 15 19:48:38 web9 sshd\[21849\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=41.223.4.155
Mar 15 19:48:41 web9 sshd\[21849\]: Failed password for invalid user adidas from 41.223.4.155 port 35900 ssh2
Mar 15 19:55:38 web9 sshd\[22968\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=41.223.4.155  user=root
Mar 15 19:55:40 web9 sshd\[22968\]: Failed password for root from 41.223.4.155 port 34348 ssh2

Unauthorized connection attempt detected from IP address 200.150.69.26 to port 2225

Mar 14 05:58:43 mail.srvfarm.net postfix/smtpd[2941132]: warning: unknown[195.231.3.155]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Mar 14 05:58:43 mail.srvfarm.net postfix/smtpd[2941132]: lost connection after AUTH from unknown[195.231.3.155]
Mar 14 05:59:18 mail.srvfarm.net postfix/smtpd[2940780]: warning: unknown[195.231.3.155]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Mar 14 05:59:18 mail.srvfarm.net postfix/smtpd[2940780]: lost connection after AUTH from unknown[195.231.3.155]
Mar 14 06:00:03 mail.srvfarm.net postfix/smtpd[2939580]: warning: unknown[195.231.3.155]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Mar 14 06:00:03 mail.srvfarm.net postfix/smtpd[2939580]: lost connection after AUTH from unknown[195.231.3.155]

Unauthorized connection attempt detected from IP address 171.83.136.6 to port 23 [T]

IP was detected trying to Brute-Force SSH, FTP, Web Apps, Port-Scan or Hacking.

Mar 16 13:41:58 itv-usvr-02 sshd[1536]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=103.146.203.12  user=root
Mar 16 13:42:00 itv-usvr-02 sshd[1536]: Failed password for root from 103.146.203.12 port 37080 ssh2
Mar 16 13:48:07 itv-usvr-02 sshd[1699]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=103.146.203.12  user=root
Mar 16 13:48:08 itv-usvr-02 sshd[1699]: Failed password for root from 103.146.203.12 port 38578 ssh2
Mar 16 13:52:00 itv-usvr-02 sshd[1842]: Invalid user epmd from 103.146.203.12 port 40078