Oct  7 14:35:13 localhost sshd\[14538\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=188.171.40.60  user=root
Oct  7 14:35:15 localhost sshd\[14538\]: Failed password for root from 188.171.40.60 port 57866 ssh2
Oct  7 14:39:11 localhost sshd\[14941\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=188.171.40.60  user=root

Oct  7 08:09:35 our-server-hostname postfix/smtpd[17040]: connect from unknown[41.83.80.88]
Oct  7 08:09:39 our-server-hostname sqlgrey: grey: new: 41.83.80.88(41.83.80.88), x@x -> x@x
Oct  7 08:09:39 our-server-hostname postfix/policy-spf[24757]: : Policy action=550 Please see hxxp://www.openspf.org/Why?s=mfrom;id=damonl%40interline.com.au;ip=41.83.80.88;r=mx1.cbr.spam-filtering-appliance 
Oct x@x
Oct  7 08:09:40 our-server-hostname postfix/smtpd[17040]: lost connection after DATA from unknown[41.83.80.88]
Oct  7 08:09:40 our-server-hostname postfix/smtpd[17040]: disconnect from unknown[41.83.80.88]
Oct  7 08:09:57 our-server-hostname postfix/smtpd[6243]: connect from unknown[41.83.80.88]
Oct  7 08:09:59 our-server-hostname sqlgrey: grey: new: 41.83.80.88(41.83.80.88), x@x -> x@x
Oct  7 08:09:59 our-server-hostname postfix/policy-spf[24853]: : Policy action=550 Please see hxxp://www.openspf.org/Why?s=mfrom;id=damcodd%40apex.net.au;ip=41.83.80.88;r=mx1.cbr.spam-filterin........
-------------------------------

Honeypot hit.

10/07/2019-14:18:14.577163 185.175.93.18 Protocol: 6 ET DROP Dshield Block Listed Source group 1

Oct  7 14:44:13 dedicated sshd[24157]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=1.179.185.50  user=root
Oct  7 14:44:16 dedicated sshd[24157]: Failed password for root from 1.179.185.50 port 35732 ssh2

Looking for resource vulnerabilities

/var/log/messages:Oct  7 10:35:10 sanyalnet-cloud-vps audispd: node=sanyalnet-cloud-vps.freeddns.org type=CRYPTO_SESSION msg=audhostname(1570444510.085:133875): pid=20987 uid=0 auid=4294967295 ses=4294967295 msg='op=start direction=from-server cipher=aes256-ctr ksize=256 mac=hmac-sha1 pfs=ecdh-sha2-nistp256 spid=20988 suid=74 rport=39174 laddr=104.167.106.93 lport=23  exe="/usr/sbin/sshd" hostname=? addr=194.181.185.102 terminal=? res=success'
/var/log/messages:Oct  7 10:35:10 sanyalnet-cloud-vps audispd: node=sanyalnet-cloud-vps.freeddns.org type=CRYPTO_SESSION msg=audhostname(1570444510.089:133876): pid=20987 uid=0 auid=4294967295 ses=4294967295 msg='op=start direction=from-client cipher=aes256-ctr ksize=256 mac=hmac-sha1 pfs=ecdh-sha2-nistp256 spid=20988 suid=74 rport=39174 laddr=104.167.106.93 lport=23  exe="/usr/sbin/sshd" hostname=? addr=194.181.185.102 terminal=? res=success'
/var/log/messages:Oct  7 10:35:10 sanyalnet-cloud-vps fail2ban.filter[1378]: INFO [sshd]........
-------------------------------

Unauthorised access (Oct  7) SRC=177.139.249.44 LEN=52 TOS=0x10 PREC=0x40 TTL=114 ID=340 DF TCP DPT=445 WINDOW=8192 SYN

Port scan on 2 port(s): 8080 9200

Oct  7 11:02:07 euve59663 sshd[13415]: Failed password for r.r from 11=
8.27.39.224 port 33838 ssh2
Oct  7 11:02:07 euve59663 sshd[13415]: Received disconnect from 118.27.=
39.224: 11: Bye Bye [preauth]
Oct  7 11:21:26 euve59663 sshd[13614]: Failed password for r.r from 11=
8.27.39.224 port 41568 ssh2
Oct  7 11:21:26 euve59663 sshd[13614]: Received disconnect from 118.27.=
39.224: 11: Bye Bye [preauth]
Oct  7 11:25:55 euve59663 sshd[13643]: Failed password for r.r from 11=
8.27.39.224 port 56110 ssh2
Oct  7 11:25:55 euve59663 sshd[13643]: Received disconnect from 118.27.=
39.224: 11: Bye Bye [preauth]
Oct  7 11:30:36 euve59663 sshd[5333]: Failed password for r.r from 118=
.27.39.224 port 42416 ssh2
Oct  7 11:30:36 euve59663 sshd[5333]: Received disconnect from 118.27.3=
9.224: 11: Bye Bye [preauth]


........
-----------------------------------------------
https://www.blocklist.de/en/view.html?ip=118.27.39.224

Oct  7 15:54:12 server sshd\[28926\]: Invalid user Windows2018 from 180.76.176.113 port 34702
Oct  7 15:54:12 server sshd\[28926\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=180.76.176.113
Oct  7 15:54:13 server sshd\[28926\]: Failed password for invalid user Windows2018 from 180.76.176.113 port 34702 ssh2
Oct  7 15:59:22 server sshd\[18971\]: Invalid user Michelle123 from 180.76.176.113 port 41618
Oct  7 15:59:22 server sshd\[18971\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=180.76.176.113

2019-10-07T12:19:26.723499abusebot.cloudsearch.cf sshd\[5278\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=s01063c37866eee85.vs.shawcable.net  user=root

Oct  7 13:47:38 relay postfix/smtpd\[26966\]: NOQUEUE: reject: RCPT from unknown\[193.32.160.136\]: 554 5.7.1 \: Relay access denied\; from=\<8vo5y5rmwos8j@apocalypse-gallery.com.cy\> to=\ proto=ESMTP helo=\<\[193.32.160.135\]\>
Oct  7 13:47:38 relay postfix/smtpd\[26966\]: NOQUEUE: reject: RCPT from unknown\[193.32.160.136\]: 554 5.7.1 \: Relay access denied\; from=\<8vo5y5rmwos8j@apocalypse-gallery.com.cy\> to=\ proto=ESMTP helo=\<\[193.32.160.135\]\>
Oct  7 13:47:38 relay postfix/smtpd\[26966\]: NOQUEUE: reject: RCPT from unknown\[193.32.160.136\]: 554 5.7.1 \: Relay access denied\; from=\<8vo5y5rmwos8j@apocalypse-gallery.com.cy\> to=\ proto=ESMTP helo=\<\[193.32.160.135\]\>
Oct  7 13:47:38 relay postfix/smtpd\[26966\]: NOQUEUE: reject: RCPT from unknown\[193.32.160.136\]: 554 5.7.1 \

Oct  7 13:44:22 host sshd\[32365\]: Failed password for root from 185.81.193.40 port 55165 ssh2
Oct  7 13:47:43 host sshd\[34096\]: Failed password for root from 185.81.193.40 port 62169 ssh2
...

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