Jun 21 14:05:10 srv01 postfix/smtpd\[9726\]: warning: unknown\[183.166.171.97\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 21 14:09:35 srv01 postfix/smtpd\[10929\]: warning: unknown\[183.166.171.97\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 21 14:14:10 srv01 postfix/smtpd\[30093\]: warning: unknown\[183.166.171.97\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 21 14:14:22 srv01 postfix/smtpd\[30093\]: warning: unknown\[183.166.171.97\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 21 14:14:38 srv01 postfix/smtpd\[30093\]: warning: unknown\[183.166.171.97\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

Aug 30 06:17:54 srv01 postfix/smtpd\[21099\]: warning: unknown\[183.166.171.28\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Aug 30 06:21:20 srv01 postfix/smtpd\[28238\]: warning: unknown\[183.166.171.28\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Aug 30 06:21:32 srv01 postfix/smtpd\[28238\]: warning: unknown\[183.166.171.28\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Aug 30 06:21:49 srv01 postfix/smtpd\[28238\]: warning: unknown\[183.166.171.28\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Aug 30 06:22:07 srv01 postfix/smtpd\[28238\]: warning: unknown\[183.166.171.28\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

Aug 25 08:07:53 srv01 postfix/smtpd\[11766\]: warning: unknown\[183.166.171.244\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Aug 25 08:08:06 srv01 postfix/smtpd\[11766\]: warning: unknown\[183.166.171.244\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Aug 25 08:08:23 srv01 postfix/smtpd\[11766\]: warning: unknown\[183.166.171.244\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Aug 25 08:08:52 srv01 postfix/smtpd\[11766\]: warning: unknown\[183.166.171.244\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Aug 25 08:09:05 srv01 postfix/smtpd\[11766\]: warning: unknown\[183.166.171.244\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

Aug 13 23:08:26 srv01 postfix/smtpd\[25298\]: warning: unknown\[183.166.171.170\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Aug 13 23:11:52 srv01 postfix/smtpd\[18832\]: warning: unknown\[183.166.171.170\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Aug 13 23:12:04 srv01 postfix/smtpd\[18832\]: warning: unknown\[183.166.171.170\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Aug 13 23:12:20 srv01 postfix/smtpd\[18832\]: warning: unknown\[183.166.171.170\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Aug 13 23:12:39 srv01 postfix/smtpd\[18832\]: warning: unknown\[183.166.171.170\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

MAIL: User Login Brute Force Attempt

Jul 20 05:51:18 srv01 postfix/smtpd\[19898\]: warning: unknown\[183.166.171.187\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 20 05:51:29 srv01 postfix/smtpd\[19898\]: warning: unknown\[183.166.171.187\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 20 05:51:45 srv01 postfix/smtpd\[19898\]: warning: unknown\[183.166.171.187\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 20 05:52:04 srv01 postfix/smtpd\[19898\]: warning: unknown\[183.166.171.187\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 20 05:52:16 srv01 postfix/smtpd\[19898\]: warning: unknown\[183.166.171.187\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

Jul 19 17:59:21 srv01 postfix/smtpd\[20325\]: warning: unknown\[183.166.171.7\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 19 18:06:27 srv01 postfix/smtpd\[25648\]: warning: unknown\[183.166.171.7\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 19 18:06:39 srv01 postfix/smtpd\[25648\]: warning: unknown\[183.166.171.7\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 19 18:06:55 srv01 postfix/smtpd\[25648\]: warning: unknown\[183.166.171.7\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul 19 18:07:17 srv01 postfix/smtpd\[25648\]: warning: unknown\[183.166.171.7\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

Jul  9 06:19:21 srv01 postfix/smtpd\[1419\]: warning: unknown\[183.166.171.172\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul  9 06:19:32 srv01 postfix/smtpd\[1419\]: warning: unknown\[183.166.171.172\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul  9 06:19:48 srv01 postfix/smtpd\[1419\]: warning: unknown\[183.166.171.172\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul  9 06:20:06 srv01 postfix/smtpd\[1419\]: warning: unknown\[183.166.171.172\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul  9 06:20:17 srv01 postfix/smtpd\[1419\]: warning: unknown\[183.166.171.172\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

Jul  8 07:28:21 srv01 postfix/smtpd\[30589\]: warning: unknown\[183.166.171.226\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul  8 07:28:33 srv01 postfix/smtpd\[30589\]: warning: unknown\[183.166.171.226\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul  8 07:28:50 srv01 postfix/smtpd\[30589\]: warning: unknown\[183.166.171.226\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul  8 07:29:09 srv01 postfix/smtpd\[30589\]: warning: unknown\[183.166.171.226\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jul  8 07:29:22 srv01 postfix/smtpd\[30589\]: warning: unknown\[183.166.171.226\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

Brute Force - Postfix

2020-01-11 15:04:32 dovecot_login authenticator failed for (czupa) [183.166.171.47]:64110 I=[192.147.25.65]:25: 535 Incorrect authentication data (set_id=chenxiaowei@lerctr.org)
2020-01-11 15:04:39 dovecot_login authenticator failed for (yfntl) [183.166.171.47]:64110 I=[192.147.25.65]:25: 535 Incorrect authentication data (set_id=chenxiaowei@lerctr.org)
2020-01-11 15:04:50 dovecot_login authenticator failed for (tagss) [183.166.171.47]:64110 I=[192.147.25.65]:25: 535 Incorrect authentication data (set_id=chenxiaofang@lerctr.org)
...

2020-01-07 07:00:04 dovecot_login authenticator failed for (thbzv) [183.166.171.252]:58029 I=[192.147.25.65]:25: 535 Incorrect authentication data (set_id=wangjianjun@lerctr.org)
2020-01-07 07:00:11 dovecot_login authenticator failed for (wapgo) [183.166.171.252]:58029 I=[192.147.25.65]:25: 535 Incorrect authentication data (set_id=wangjianjun@lerctr.org)
2020-01-07 07:00:22 dovecot_login authenticator failed for (rzryn) [183.166.171.252]:58029 I=[192.147.25.65]:25: 535 Incorrect authentication data (set_id=wangjianjun@lerctr.org)
...

2019-12-27T23:55:39.167791 X postfix/smtpd[19310]: lost connection after AUTH from unknown[183.166.171.134]
2019-12-27T23:55:40.493571 X postfix/smtpd[19306]: lost connection after AUTH from unknown[183.166.171.134]
2019-12-27T23:55:41.691790 X postfix/smtpd[17097]: lost connection after AUTH from unknown[183.166.171.134]
2019-12-27T23:55:41.829293 X postfix/smtpd[17319]: lost connection after AUTH from unknown[183.166.171.134]

2019-12-26T15:47:14.837598 X postfix/smtpd[31867]: lost connection after AUTH from unknown[183.166.171.104]
2019-12-26T15:47:15.637371 X postfix/smtpd[31867]: lost connection after AUTH from unknown[183.166.171.104]
2019-12-26T15:47:15.825707 X postfix/smtpd[42991]: lost connection after AUTH from unknown[183.166.171.104]
2019-12-26T15:47:15.935087 X postfix/smtpd[42993]: lost connection after AUTH from unknown[183.166.171.104]

SSH invalid-user multiple login try

Tried sshing with brute force.

F2B jail: sshd. Time: 2019-10-21 07:18:30, Reported by: VKReport

Oct 21 05:53:49 rotator sshd\[8942\]: Failed password for root from 83.97.20.243 port 40103 ssh2Oct 21 05:53:52 rotator sshd\[8942\]: Failed password for root from 83.97.20.243 port 40103 ssh2Oct 21 05:53:54 rotator sshd\[8942\]: Failed password for root from 83.97.20.243 port 40103 ssh2Oct 21 05:53:56 rotator sshd\[8942\]: Failed password for root from 83.97.20.243 port 40103 ssh2Oct 21 05:53:59 rotator sshd\[8942\]: Failed password for root from 83.97.20.243 port 40103 ssh2Oct 21 05:54:02 rotator sshd\[8942\]: Failed password for root from 83.97.20.243 port 40103 ssh2
...

Oct 21 07:25:18 meumeu sshd[17252]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=139.199.59.235 
Oct 21 07:25:21 meumeu sshd[17252]: Failed password for invalid user ansible from 139.199.59.235 port 60292 ssh2
Oct 21 07:25:38 meumeu sshd[17288]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=139.199.59.235 
...

2019-10-21T03:53:33.694329abusebot-7.cloudsearch.cf sshd\[26683\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=101.36.138.61  user=root

Oct 21 07:57:12 h2177944 sshd\[9601\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.169.192  user=root
Oct 21 07:57:13 h2177944 sshd\[9601\]: Failed password for root from 222.186.169.192 port 52614 ssh2
Oct 21 07:57:17 h2177944 sshd\[9601\]: Failed password for root from 222.186.169.192 port 52614 ssh2
Oct 21 07:57:20 h2177944 sshd\[9601\]: Failed password for root from 222.186.169.192 port 52614 ssh2
...

Oct 20 19:28:02 eddieflores sshd\[31093\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=180.250.248.39  user=root
Oct 20 19:28:03 eddieflores sshd\[31093\]: Failed password for root from 180.250.248.39 port 38684 ssh2
Oct 20 19:32:53 eddieflores sshd\[31466\]: Invalid user udo from 180.250.248.39
Oct 20 19:32:53 eddieflores sshd\[31466\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=180.250.248.39
Oct 20 19:32:55 eddieflores sshd\[31466\]: Failed password for invalid user udo from 180.250.248.39 port 49018 ssh2

Honeypot attack, port: 23, PTR: PTR record not found

Honeypot attack, port: 445, PTR: static.vnpt.vn.

Oct 20 19:28:06 sachi sshd\[11733\]: Invalid user bess from 207.180.239.212
Oct 20 19:28:07 sachi sshd\[11733\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=vmi222346.contaboserver.net
Oct 20 19:28:08 sachi sshd\[11733\]: Failed password for invalid user bess from 207.180.239.212 port 51568 ssh2
Oct 20 19:32:08 sachi sshd\[12082\]: Invalid user nistrator from 207.180.239.212
Oct 20 19:32:08 sachi sshd\[12082\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=vmi222346.contaboserver.net

2019-10-20 22:53:31 H=(livingbusiness.it) [176.104.107.105]:57549 I=[192.147.25.65]:25 F= rejected RCPT : RBL: found in thrukfz5b56tq6xao6odgdyjrq.zen.dq.spamhaus.net (127.0.0.4, 127.0.0.3) (https://www.spamhaus.org/sbl/query/SBLCSS)
2019-10-20 22:53:31 H=(livingbusiness.it) [176.104.107.105]:57549 I=[192.147.25.65]:25 F= rejected RCPT : RBL: found in thrukfz5b56tq6xao6odgdyjrq.zen.dq.spamhaus.net (127.0.0.4, 127.0.0.3) (https://www.spamhaus.org/sbl/query/SBLCSS)
2019-10-20 22:53:31 H=(livingbusiness.it) [176.104.107.105]:57549 I=[192.147.25.65]:25 F= rejected RCPT : RBL: found in thrukfz5b56tq6xao6odgdyjrq.zen.dq.spamhaus.net (127.0.0.4, 127.0.0.3) (https://www.spamhaus.org/sbl/query/SBLCSS)
...

Oct 21 06:45:50 meumeu sshd[6166]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=148.70.113.96 
Oct 21 06:45:51 meumeu sshd[6166]: Failed password for invalid user www from 148.70.113.96 port 35538 ssh2
Oct 21 06:46:14 meumeu sshd[6232]: Failed password for root from 148.70.113.96 port 37158 ssh2
...

Oct 21 06:47:29 meumeu sshd[6498]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=159.203.251.90 
Oct 21 06:47:32 meumeu sshd[6498]: Failed password for invalid user test from 159.203.251.90 port 49070 ssh2
Oct 21 06:47:48 meumeu sshd[6546]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=159.203.251.90 
...

$f2bV_matches

Oct 21 01:42:52 xtremcommunity sshd\[732237\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.175.148  user=root
Oct 21 01:42:54 xtremcommunity sshd\[732237\]: Failed password for root from 222.186.175.148 port 24352 ssh2
Oct 21 01:42:58 xtremcommunity sshd\[732237\]: Failed password for root from 222.186.175.148 port 24352 ssh2
Oct 21 01:43:02 xtremcommunity sshd\[732237\]: Failed password for root from 222.186.175.148 port 24352 ssh2
Oct 21 01:43:06 xtremcommunity sshd\[732237\]: Failed password for root from 222.186.175.148 port 24352 ssh2
...