[Fri Mar 06 11:59:30.545468 2020] [:error] [pid 31020:tid 139856877369088] [client 141.8.132.9:65111] [client 141.8.132.9] 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 "XmHYsnCflmAPk@m9WrMERAAAAUo"]
...

[Sat Feb 29 14:56:42.035661 2020] [:error] [pid 29110:tid 139674565330688] [client 141.8.132.9:43321] [client 141.8.132.9] 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 "XloZOpx7NO9kbZBSNHkZEwAAAHA"]
...

[Thu Feb 13 20:48:12.442472 2020] [:error] [pid 5260:tid 140369236838144] [client 141.8.132.9:42647] [client 141.8.132.9] 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 "XkVTnDu2DnY6B6UC0cpgPQAAAU4"]
...

[Sat Mar 28 10:50:44.624989 2020] [:error] [pid 2503:tid 140512424277760] [client 141.8.132.24:63421] [client 141.8.132.24] 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 "Xn7JlIEzdW-Oybip5HuyiAAAAAI"]
...

[Fri Mar 20 23:06:01.210367 2020] [:error] [pid 2262:tid 140147611977472] [client 141.8.132.35:61631] [client 141.8.132.35] 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 "XnTp6aAlAPii2bELv6MmFgAAAcI"]
...

[Fri Mar 20 20:09:17.192662 2020] [:error] [pid 15887:tid 139661176485632] [client 141.8.132.24:65023] [client 141.8.132.24] 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 "XnTAfXEhhvTdM6dYCcoxwgAAAcQ"]
...

[Fri Feb 28 14:52:46.977362 2020] [:error] [pid 1246:tid 140235423225600] [client 141.8.132.35:45795] [client 141.8.132.35] 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 "XljGzgA5lnWByBR8NxkKFwAAAYI"]
...

[Thu Feb 27 21:20:09.236135 2020] [:error] [pid 3621:tid 139837702010624] [client 141.8.132.24:65499] [client 141.8.132.24] 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 "XlfQGXgSyCP9O11ZuEgQHgAAAUw"]
...

[Fri Feb 14 16:12:26.285894 2020] [:error] [pid 7278:tid 139821208127232] [client 141.8.132.24:55669] [client 141.8.132.24] 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 "XkZkelgSmFwFyJu5ztJOHgAAAfM"]
...

[Wed Oct 16 10:21:00.960797 2019] [:error] [pid 30195:tid 140011680777984] [client 141.8.132.35:37423] [client 141.8.132.35] 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 "XaaMnLM@ItsqtwqqCPDkWQAAAFA"]
...

[Wed Jul 10 06:18:52.302937 2019] [:error] [pid 12219:tid 139977212000000] [client 141.8.132.24:40127] [client 141.8.132.24] 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 "XSUg3FIMVtpCcCd8oJ8TkAAAAAg"]
...

[Thu Jun 27 12:25:38.565576 2019] [:error] [pid 26865:tid 140527362074368] [client 141.8.132.35:59414] [client 141.8.132.35] 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 "XRRTUhlQuTljWBroxg@h6QAAAAk"]
...

May 15 14:59:21 plex sshd[14073]: Invalid user user2 from 49.233.189.161 port 46300

2020-05-15T14:23:36.507821vps773228.ovh.net sshd[26828]: Invalid user deploy from 132.232.23.135 port 47638
2020-05-15T14:23:36.516230vps773228.ovh.net sshd[26828]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=132.232.23.135
2020-05-15T14:23:36.507821vps773228.ovh.net sshd[26828]: Invalid user deploy from 132.232.23.135 port 47638
2020-05-15T14:23:37.877350vps773228.ovh.net sshd[26828]: Failed password for invalid user deploy from 132.232.23.135 port 47638 ssh2
2020-05-15T14:29:01.710142vps773228.ovh.net sshd[26907]: Invalid user ivory from 132.232.23.135 port 49404
...

May 15 14:28:57 debian-2gb-nbg1-2 kernel: \[11804586.223562\] \[UFW BLOCK\] IN=eth0 OUT= MAC=96:00:00:0e:18:f4:d2:74:7f:6e:37:e3:08:00 SRC=81.91.176.120 DST=195.201.40.59 LEN=40 TOS=0x00 PREC=0x00 TTL=244 ID=52380 PROTO=TCP SPT=54108 DPT=944 WINDOW=1024 RES=0x00 SYN URGP=0

port scan and connect, tcp 22 (ssh)

May 15 14:28:39 mout sshd[32312]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=54.37.154.248  user=root
May 15 14:28:42 mout sshd[32312]: Failed password for root from 54.37.154.248 port 33450 ssh2

May 15 22:14:10 web1 sshd[22885]: Invalid user ftpuser from 206.189.132.8 port 42834
May 15 22:14:10 web1 sshd[22885]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=206.189.132.8
May 15 22:14:10 web1 sshd[22885]: Invalid user ftpuser from 206.189.132.8 port 42834
May 15 22:14:12 web1 sshd[22885]: Failed password for invalid user ftpuser from 206.189.132.8 port 42834 ssh2
May 15 22:23:05 web1 sshd[25188]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=206.189.132.8  user=root
May 15 22:23:08 web1 sshd[25188]: Failed password for root from 206.189.132.8 port 39766 ssh2
May 15 22:25:44 web1 sshd[25861]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=206.189.132.8  user=root
May 15 22:25:46 web1 sshd[25861]: Failed password for root from 206.189.132.8 port 53520 ssh2
May 15 22:28:24 web1 sshd[26493]: Invalid user build from 206.189.132.8 port 39044
...

$f2bV_matches

From: Combat Earplugs  "MarketingPromoSystems, 8 The Green Suite #5828 Dover DE" 193.218.158.129 EHLO charlotte.packageminds.com - phishing redirect

80.82.77.42 was recorded 7 times by 3 hosts attempting to connect to the following ports: 5632,69,1434. Incident counter (4h, 24h, all-time): 7, 35, 246

May 15 13:28:51 combo sshd[19469]: Failed password for root from 112.85.42.180 port 46981 ssh2
May 15 13:28:53 combo sshd[19469]: Failed password for root from 112.85.42.180 port 46981 ssh2
May 15 13:28:57 combo sshd[19469]: Failed password for root from 112.85.42.180 port 46981 ssh2
...

$f2bV_matches | Triggered by Fail2Ban at Vostok web server

May 15 14:54:21 server sshd[12219]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=217.19.154.218
May 15 14:54:22 server sshd[12219]: Failed password for invalid user ts3server3 from 217.19.154.218 port 27888 ssh2
May 15 14:59:41 server sshd[12583]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=217.19.154.218
...

May 15 14:16:15 ns382633 sshd\[20023\]: Invalid user user from 66.70.130.149 port 51580
May 15 14:16:15 ns382633 sshd\[20023\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=66.70.130.149
May 15 14:16:17 ns382633 sshd\[20023\]: Failed password for invalid user user from 66.70.130.149 port 51580 ssh2
May 15 14:28:30 ns382633 sshd\[22247\]: Invalid user dcc from 66.70.130.149 port 52900
May 15 14:28:30 ns382633 sshd\[22247\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=66.70.130.149

"XSS Attack Detected via libinjection - Matched Data: XSS data found within ARGS_NAMES:

May 15 14:53:59 vps sshd[411731]: Failed password for root from 222.186.30.76 port 22222 ssh2
May 15 14:54:02 vps sshd[411731]: Failed password for root from 222.186.30.76 port 22222 ssh2
May 15 14:54:05 vps sshd[412544]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.30.76  user=root
May 15 14:54:07 vps sshd[412544]: Failed password for root from 222.186.30.76 port 47495 ssh2
May 15 14:54:10 vps sshd[412544]: Failed password for root from 222.186.30.76 port 47495 ssh2
...