2019-11-16T22:36:53.302387beta postfix/smtpd[6398]: NOQUEUE: reject: RCPT from unknown[45.91.151.20]: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [45.91.151.20]; from= to= proto=ESMTP helo=
2019-11-16T22:46:55.086191beta postfix/smtpd[6589]: NOQUEUE: reject: RCPT from unknown[45.91.151.20]: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [45.91.151.20]; from= to= proto=ESMTP helo=
2019-11-16T22:56:55.139174beta postfix/smtpd[6901]: NOQUEUE: reject: RCPT from unknown[45.91.151.20]: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [45.91.151.20]; from= to= proto=ESMTP helo=
...

WordPress login Brute force / Web App Attack on client site.

11/16/2019-23:56:22.079840 62.210.10.244 Protocol: 17 ATTACK [PTSecurity] Cisco ASA and Cisco FTD possible DoS (CVE-2018-15454)

Nov 17 01:54:30 mail postfix/smtpd[30438]: warning: unknown[5.196.201.7]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Nov 17 01:55:25 mail postfix/smtpd[30533]: warning: unknown[5.196.201.7]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Nov 17 01:55:29 mail postfix/smtpd[29267]: warning: unknown[5.196.201.7]: SASL LOGIN authentication failed: UGFzc3dvcmQ6

Nov 16 05:24:57 host sshd[3932]: reveeclipse mapping checking getaddrinfo for 187.59.203.226.static.host.gvt.net.br [187.59.203.226] failed - POSSIBLE BREAK-IN ATTEMPT!
Nov 16 05:24:57 host sshd[3932]: Invalid user masanpar from 187.59.203.226
Nov 16 05:24:57 host sshd[3932]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=187.59.203.226 
Nov 16 05:24:59 host sshd[3932]: Failed password for invalid user masanpar from 187.59.203.226 port 41338 ssh2
Nov 16 05:24:59 host sshd[3932]: Received disconnect from 187.59.203.226: 11: Bye Bye [preauth]
Nov 16 05:29:24 host sshd[17181]: reveeclipse mapping checking getaddrinfo for 187.59.203.226.static.host.gvt.net.br [187.59.203.226] failed - POSSIBLE BREAK-IN ATTEMPT!
Nov 16 05:29:24 host sshd[17181]: Invalid user xz from 187.59.203.226
Nov 16 05:29:24 host sshd[17181]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=187.59.203.226 
Nov 16 05:29:26 ho........
-------------------------------

Nov 16 22:06:53 firewall sshd[2994]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=110.80.17.26  user=root
Nov 16 22:06:55 firewall sshd[2994]: Failed password for root from 110.80.17.26 port 55946 ssh2
Nov 16 22:10:51 firewall sshd[3071]: Invalid user 123 from 110.80.17.26
...

As always with vultr

Nov 17 01:03:49 sshgateway sshd\[32532\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.175.167  user=root
Nov 17 01:03:51 sshgateway sshd\[32532\]: Failed password for root from 222.186.175.167 port 28168 ssh2
Nov 17 01:04:04 sshgateway sshd\[32532\]: error: maximum authentication attempts exceeded for root from 222.186.175.167 port 28168 ssh2 \[preauth\]

IP Ban Report :  
 https://help-dysk.pl/wordpress-firewall-plugins/ip/183.109.162.177/ 
 
 KR - 1H : (55)  
 Protection Against DDoS WordPress plugin :  
 "odzyskiwanie danych help-dysk" 
 IP Address Ranges by Country : KR 
 NAME ASN : ASN4766 
 
 IP : 183.109.162.177 
 
 CIDR : 183.109.128.0/17 
 
 PREFIX COUNT : 8136 
 
 UNIQUE IP COUNT : 44725248 
 
 
 ATTACKS DETECTED ASN4766 :  
  1H - 2 
  3H - 4 
  6H - 8 
 12H - 20 
 24H - 36 
 
 DateTime : 2019-11-16 23:56:29 
 
 INFO : Port Scan TELNET Detected and Blocked by ADMIN  - data recovery

SSH bruteforce

Brute force attempt

Nov 17 00:33:21 venus sshd\[3873\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=115.112.176.198  user=root
Nov 17 00:33:23 venus sshd\[3873\]: Failed password for root from 115.112.176.198 port 58086 ssh2
Nov 17 00:37:33 venus sshd\[3979\]: Invalid user ubnt from 115.112.176.198 port 37922
...

Invalid user support from 61.132.87.130 port 64028

Nov 17 01:04:19 dedicated sshd[8013]: Invalid user marget from 122.152.197.6 port 35182

Nov 17 02:17:28 vpn01 sshd[25992]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.12.28.124
Nov 17 02:17:30 vpn01 sshd[25992]: Failed password for invalid user 12345 from 106.12.28.124 port 41898 ssh2
...