smtp probe/invalid login attempt

[Fri Jan 10 11:53:33.004230 2020] [:error] [pid 696:tid 140287733106432] [client 5.45.207.56:38707] [client 5.45.207.56] ModSecurity: Access denied with code 403 (phase 2). Pattern match "^[\\\\d.:]+$" at REQUEST_HEADERS:Host. [file "/etc/modsecurity/owasp-modsecurity-crs-3.2.0/rules/REQUEST-920-PROTOCOL-ENFORCEMENT.conf"] [line "696"] [id "920350"] [msg "Host header is a numeric IP address"] [data "103.27.207.197"] [severity "WARNING"] [ver "OWASP_CRS/3.2.0"] [tag "application-multi"] [tag "language-multi"] [tag "platform-multi"] [tag "attack-protocol"] [tag "OWASP_CRS"] [tag "OWASP_CRS/PROTOCOL_VIOLATION/IP_HOST"] [tag "WASCTC/WASC-21"] [tag "OWASP_TOP_10/A7"] [tag "PCI/6.5.10"] [hostname "103.27.207.197"] [uri "/"] [unique_id "XhgDTcjKGZdirMZ6XOjbTQAAAAc"]
...

Jan 10 04:51:55 124388 sshd[1164]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=54.38.188.34
Jan 10 04:51:55 124388 sshd[1164]: Invalid user teamspeak3 from 54.38.188.34 port 50220
Jan 10 04:51:57 124388 sshd[1164]: Failed password for invalid user teamspeak3 from 54.38.188.34 port 50220 ssh2
Jan 10 04:54:06 124388 sshd[1171]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=54.38.188.34  user=root
Jan 10 04:54:08 124388 sshd[1171]: Failed password for root from 54.38.188.34 port 45854 ssh2

Jan 10 05:53:34 hosting180 sshd[5875]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=193.112.123.100  user=root
Jan 10 05:53:36 hosting180 sshd[5875]: Failed password for root from 193.112.123.100 port 52900 ssh2
...

10.01.2020 08:08:16 SSH access blocked by firewall

01/10/2020-05:53:48.612536 221.214.208.135 Protocol: 6 ET SCAN Suspicious inbound to MSSQL port 1433

ssh brute force

Automatic report - Port Scan Attack

Jan 10 07:49:23 hcbbdb sshd\[2184\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.180.41  user=root
Jan 10 07:49:24 hcbbdb sshd\[2184\]: Failed password for root from 222.186.180.41 port 27814 ssh2
Jan 10 07:49:39 hcbbdb sshd\[2199\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.180.41  user=root
Jan 10 07:49:41 hcbbdb sshd\[2199\]: Failed password for root from 222.186.180.41 port 27174 ssh2
Jan 10 07:49:43 hcbbdb sshd\[2199\]: Failed password for root from 222.186.180.41 port 27174 ssh2

Jan 10 09:10:15 debian-2gb-nbg1-2 kernel: \[903125.851754\] \[UFW BLOCK\] IN=eth0 OUT= MAC=96:00:00:0e:18:f4:d2:74:7f:6e:37:e3:08:00 SRC=185.153.196.47 DST=195.201.40.59 LEN=40 TOS=0x00 PREC=0x00 TTL=241 ID=31313 PROTO=TCP SPT=54841 DPT=3321 WINDOW=1024 RES=0x00 SYN URGP=0

Jan 10 05:53:30 grey postfix/smtpd\[32712\]: NOQUEUE: reject: RCPT from unknown\[103.123.65.58\]: 554 5.7.1 Service unavailable\; Client host \[103.123.65.58\] blocked using truncate.gbudb.net\; http://www.gbudb.com/truncate/ \[103.123.65.58\]\; from=\ to=\ proto=ESMTP helo=\<\[103.123.65.58\]\>
...

Automatic report - Port Scan Attack

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

2020-01-09 22:53:42 dovecot_login authenticator failed for (tmaoo) [220.161.79.57]:51132 I=[192.147.25.65]:25: 535 Incorrect authentication data (set_id=zhangjianjun@lerctr.org)
2020-01-09 22:53:49 dovecot_login authenticator failed for (mnpsd) [220.161.79.57]:51132 I=[192.147.25.65]:25: 535 Incorrect authentication data (set_id=zhangjianjun@lerctr.org)
2020-01-09 22:54:01 dovecot_login authenticator failed for (bwrfx) [220.161.79.57]:51132 I=[192.147.25.65]:25: 535 Incorrect authentication data (set_id=zhangjianjun@lerctr.org)
...

frenzy