[Sat Jan 11 11:54:07.162593 2020] [:error] [pid 8800:tid 140478062237440] [client 178.167.121.37:39267] [client 178.167.121.37] 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 "103.27.207.197:80"] [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 "XhlU70FSo6M0xj5ZHKj41wAAAAo"]
...

Jan 11 06:48:45 localhost sshd\[11561\]: Invalid user ew from 161.117.176.196
Jan 11 06:48:45 localhost sshd\[11561\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=161.117.176.196
Jan 11 06:48:47 localhost sshd\[11561\]: Failed password for invalid user ew from 161.117.176.196 port 47923 ssh2
Jan 11 06:51:19 localhost sshd\[11763\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=161.117.176.196  user=root
Jan 11 06:51:21 localhost sshd\[11763\]: Failed password for root from 161.117.176.196 port 8370 ssh2
...

B: f2b postfix aggressive 3x

Jan 10 22:16:28 php1 sshd\[26882\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.175.23  user=root
Jan 10 22:16:30 php1 sshd\[26882\]: Failed password for root from 222.186.175.23 port 61010 ssh2
Jan 10 22:22:41 php1 sshd\[27415\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.175.23  user=root
Jan 10 22:22:42 php1 sshd\[27415\]: Failed password for root from 222.186.175.23 port 20717 ssh2
Jan 10 22:22:45 php1 sshd\[27415\]: Failed password for root from 222.186.175.23 port 20717 ssh2

01/11/2020-09:04:46.049938 52.34.195.239 Protocol: 6 SURICATA TLS invalid record/traffic

TCP port 1284: Scan and connection

port 0:65535

$f2bV_matches

Jan 11 02:18:03 ws22vmsma01 sshd[38269]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.12.179.81
Jan 11 02:18:05 ws22vmsma01 sshd[38269]: Failed password for invalid user ss from 106.12.179.81 port 56660 ssh2
...

Jan 11 06:54:01 vtv3 sshd[17553]: Failed password for root from 198.23.129.3 port 44620 ssh2
Jan 11 07:01:43 vtv3 sshd[21314]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=198.23.129.3 
Jan 11 07:01:46 vtv3 sshd[21314]: Failed password for invalid user user6 from 198.23.129.3 port 58842 ssh2
Jan 11 07:12:48 vtv3 sshd[26238]: Failed password for root from 198.23.129.3 port 39058 ssh2
Jan 11 07:13:59 vtv3 sshd[26741]: Failed password for root from 198.23.129.3 port 49402 ssh2
Jan 11 07:25:54 vtv3 sshd[32743]: Failed password for root from 198.23.129.3 port 39938 ssh2
Jan 11 07:27:11 vtv3 sshd[767]: Failed password for root from 198.23.129.3 port 50282 ssh2
Jan 11 07:39:18 vtv3 sshd[6115]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=198.23.129.3 
Jan 11 07:39:21 vtv3 sshd[6115]: Failed password for invalid user zz from 198.23.129.3 port 40854 ssh2
Jan 11 07:40:43 vtv3 sshd[7035]: Failed password for root from 198.23.129.3 port

2020-01-11T05:36:24.202454host3.slimhost.com.ua sshd[524756]: Invalid user monitor from 84.215.23.72 port 59655
2020-01-11T05:36:24.207925host3.slimhost.com.ua sshd[524756]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=cm-84.215.23.72.getinternet.no
2020-01-11T05:36:24.202454host3.slimhost.com.ua sshd[524756]: Invalid user monitor from 84.215.23.72 port 59655
2020-01-11T05:36:25.698484host3.slimhost.com.ua sshd[524756]: Failed password for invalid user monitor from 84.215.23.72 port 59655 ssh2
2020-01-11T05:51:05.861612host3.slimhost.com.ua sshd[528868]: Invalid user hsl from 84.215.23.72 port 55297
2020-01-11T05:51:05.868732host3.slimhost.com.ua sshd[528868]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=cm-84.215.23.72.getinternet.no
2020-01-11T05:51:05.861612host3.slimhost.com.ua sshd[528868]: Invalid user hsl from 84.215.23.72 port 55297
2020-01-11T05:51:07.640046host3.slimhost.com.ua sshd[528868]:
...

Jan 11 05:54:06 herz-der-gamer sshd[27962]: Invalid user obl from 106.12.125.140 port 50966
Jan 11 05:54:06 herz-der-gamer sshd[27962]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.12.125.140
Jan 11 05:54:06 herz-der-gamer sshd[27962]: Invalid user obl from 106.12.125.140 port 50966
Jan 11 05:54:08 herz-der-gamer sshd[27962]: Failed password for invalid user obl from 106.12.125.140 port 50966 ssh2
...

Jan 11 08:10:46 lnxmysql61 sshd[9240]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=119.205.235.251
Jan 11 08:10:48 lnxmysql61 sshd[9240]: Failed password for invalid user john from 119.205.235.251 port 50098 ssh2
Jan 11 08:13:35 lnxmysql61 sshd[9343]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=119.205.235.251

SSH Brute Force

Jan 11 05:53:14 grey postfix/smtpd\[9485\]: NOQUEUE: reject: RCPT from unknown\[182.55.233.169\]: 554 5.7.1 Service unavailable\; Client host \[182.55.233.169\] blocked using truncate.gbudb.net\; http://www.gbudb.com/truncate/ \[182.55.233.169\]\; from=\ to=\ proto=ESMTP helo=\<\[182.55.233.169\]\>
...