WP Authentication failure

[Tue Jul 09 17:35:29.036980 2019] [:error] [pid 28688:tid 140218795484928] [client 198.108.66.161:14568] [client 198.108.66.161] ModSecurity: Access denied with code 403 (phase 2). Pattern match "^[\\\\d.:]+$" at REQUEST_HEADERS:Host. [file "/etc/modsecurity/owasp-modsecurity-crs-3.1.1/rules/REQUEST-920-PROTOCOL-ENFORCEMENT.conf"] [line "792"] [id "920350"] [msg "Host header is a numeric IP address"] [data "103.27.207.197"] [severity "WARNING"] [ver "OWASP_CRS/3.1.1"] [tag "application-multi"] [tag "language-multi"] [tag "platform-multi"] [tag "attack-protocol"] [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 "XSRt8SzNh6dtYfl0MoDl9QAAABU"]
...

\[2019-07-09 07:30:50\] NOTICE\[13443\] chan_sip.c: Registration from '"49" \' failed for '142.4.18.106:5078' - Wrong password
\[2019-07-09 07:30:50\] SECURITY\[13451\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-07-09T07:30:50.811-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="49",SessionID="0x7f02f85a4d78",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/142.4.18.106/5078",Challenge="2958b01f",ReceivedChallenge="2958b01f",ReceivedHash="e04932c4f2116749447dd58ef6787be1"
\[2019-07-09 07:30:50\] NOTICE\[13443\] chan_sip.c: Registration from '"49" \' failed for '142.4.18.106:5078' - Wrong password
\[2019-07-09 07:30:50\] SECURITY\[13451\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-07-09T07:30:50.945-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="49",SessionID="0x7f02f88cef08",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/142.4.18.

Jul  9 11:19:33 OPSO sshd\[29948\]: Invalid user fuck from 106.12.116.185 port 38592
Jul  9 11:19:33 OPSO sshd\[29948\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.12.116.185
Jul  9 11:19:35 OPSO sshd\[29948\]: Failed password for invalid user fuck from 106.12.116.185 port 38592 ssh2
Jul  9 11:22:17 OPSO sshd\[30330\]: Invalid user festival from 106.12.116.185 port 60680
Jul  9 11:22:17 OPSO sshd\[30330\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.12.116.185

Jul  8 03:36:57 lhostnameo sshd[28679]: Invalid user samba from 103.206.254.202 port 46752
Jul  8 03:36:57 lhostnameo sshd[28679]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=103.206.254.202
Jul  8 03:36:59 lhostnameo sshd[28679]: Failed password for invalid user samba from 103.206.254.202 port 46752 ssh2
Jul  8 03:39:36 lhostnameo sshd[29517]: Invalid user cs from 103.206.254.202 port 44140
Jul  8 03:39:36 lhostnameo sshd[29517]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=103.206.254.202

........
-----------------------------------------------
https://www.blocklist.de/en/view.html?ip=103.206.254.202

\[2019-07-09 05:07:42\] NOTICE\[13443\] chan_sip.c: Registration from '\' failed for '63.143.35.146:49862' - Wrong password
\[2019-07-09 05:07:42\] SECURITY\[13451\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-07-09T05:07:42.651-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="80",SessionID="0x7f02f876b078",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/63.143.35.146/49862",Challenge="2c6714e1",ReceivedChallenge="2c6714e1",ReceivedHash="1585cc2997d2db6fdde30ecd512207b7"
\[2019-07-09 05:08:47\] NOTICE\[13443\] chan_sip.c: Registration from '\' failed for '63.143.35.146:55324' - Wrong password
\[2019-07-09 05:08:47\] SECURITY\[13451\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-07-09T05:08:47.867-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="8",SessionID="0x7f02f835fad8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/63.143.35.146/5

proto=tcp  .  spt=48972  .  dpt=25  .     (listed on Blocklist de  Jul 08)     (164)

Jul  9 08:39:35 vibhu-HP-Z238-Microtower-Workstation sshd\[27094\]: Invalid user Irina from 178.128.57.96
Jul  9 08:39:35 vibhu-HP-Z238-Microtower-Workstation sshd\[27094\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=178.128.57.96
Jul  9 08:39:37 vibhu-HP-Z238-Microtower-Workstation sshd\[27094\]: Failed password for invalid user Irina from 178.128.57.96 port 58292 ssh2
Jul  9 08:43:29 vibhu-HP-Z238-Microtower-Workstation sshd\[27164\]: Invalid user subhana from 178.128.57.96
Jul  9 08:43:29 vibhu-HP-Z238-Microtower-Workstation sshd\[27164\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=178.128.57.96
...

Jul  9 05:16:52 web01 postfix/smtpd[12926]: warning: hostname flight.swingthelamp.com does not resolve to address 212.7.222.198
Jul  9 05:16:52 web01 postfix/smtpd[12926]: connect from unknown[212.7.222.198]
Jul  9 05:16:52 web01 policyd-spf[13754]: None; identhostnamey=helo; client-ip=212.7.222.198; helo=flight.noureliya.com; envelope-from=x@x
Jul  9 05:16:52 web01 policyd-spf[13754]: Pass; identhostnamey=mailfrom; client-ip=212.7.222.198; helo=flight.noureliya.com; envelope-from=x@x
Jul x@x
Jul  9 05:16:53 web01 postfix/smtpd[12926]: disconnect from unknown[212.7.222.198]
Jul  9 05:24:41 web01 postfix/smtpd[13254]: warning: hostname flight.swingthelamp.com does not resolve to address 212.7.222.198
Jul  9 05:24:41 web01 postfix/smtpd[13254]: connect from unknown[212.7.222.198]
Jul  9 05:24:41 web01 policyd-spf[14288]: None; identhostnamey=helo; client-ip=212.7.222.198; helo=flight.noureliya.com; envelope-from=x@x
Jul  9 05:24:41 web01 policyd-spf[14288]: Pass; identhos........
-------------------------------

Automatic report - Web App Attack

$f2bV_matches

proto=tcp  .  spt=36621  .  dpt=25  .     (listed on Blocklist de  Jul 08)     (170)

Brute force attempt

Telnet Server BruteForce Attack

proto=tcp  .  spt=39260  .  dpt=25  .     (listed on Blocklist de  Jul 08)     (175)