Sep 14 00:47:36 itv-usvr-01 sshd[4378]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=203.186.54.237  user=root
Sep 14 00:47:38 itv-usvr-01 sshd[4378]: Failed password for root from 203.186.54.237 port 45286 ssh2

Sep 12 20:01:57 srv01 postfix/smtpd\[8226\]: warning: unknown\[117.69.159.249\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Sep 12 20:05:22 srv01 postfix/smtpd\[7909\]: warning: unknown\[117.69.159.249\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Sep 12 20:12:16 srv01 postfix/smtpd\[14595\]: warning: unknown\[117.69.159.249\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Sep 12 20:15:42 srv01 postfix/smtpd\[16249\]: warning: unknown\[117.69.159.249\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Sep 12 20:19:09 srv01 postfix/smtpd\[8226\]: warning: unknown\[117.69.159.249\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

2020-09-13T16:01[Censored Hostname] sshd[27584]: Failed password for root from 185.100.85.61 port 59654 ssh2
2020-09-13T16:01[Censored Hostname] sshd[27584]: Failed password for root from 185.100.85.61 port 59654 ssh2
2020-09-13T16:01[Censored Hostname] sshd[27584]: Failed password for root from 185.100.85.61 port 59654 ssh2[...]

[H1] Blocked by UFW

Sep 13 21:05:23 srv-ubuntu-dev3 sshd[43632]: Invalid user phpagi from 35.230.150.70
Sep 13 21:05:23 srv-ubuntu-dev3 sshd[43632]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=35.230.150.70
Sep 13 21:05:23 srv-ubuntu-dev3 sshd[43632]: Invalid user phpagi from 35.230.150.70
Sep 13 21:05:25 srv-ubuntu-dev3 sshd[43632]: Failed password for invalid user phpagi from 35.230.150.70 port 52726 ssh2
Sep 13 21:08:52 srv-ubuntu-dev3 sshd[44053]: Invalid user login from 35.230.150.70
Sep 13 21:08:52 srv-ubuntu-dev3 sshd[44053]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=35.230.150.70
Sep 13 21:08:52 srv-ubuntu-dev3 sshd[44053]: Invalid user login from 35.230.150.70
Sep 13 21:08:53 srv-ubuntu-dev3 sshd[44053]: Failed password for invalid user login from 35.230.150.70 port 57452 ssh2
Sep 13 21:12:14 srv-ubuntu-dev3 sshd[44460]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=
...

(sshd) Failed SSH login from 47.180.212.134 (-): 5 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_SSHD; Logs: Sep 13 20:14:11 grace sshd[26674]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=47.180.212.134  user=root
Sep 13 20:14:13 grace sshd[26674]: Failed password for root from 47.180.212.134 port 44644 ssh2
Sep 13 20:17:48 grace sshd[27142]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=47.180.212.134  user=root
Sep 13 20:17:50 grace sshd[27142]: Failed password for root from 47.180.212.134 port 41769 ssh2
Sep 13 20:19:41 grace sshd[27180]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=47.180.212.134  user=root

firewall-block, port(s): 23/tcp

Automatic report - Port Scan Attack

Sep 13 21:14:03 minden010 sshd[32131]: Failed password for root from 61.177.172.128 port 52596 ssh2
Sep 13 21:14:06 minden010 sshd[32131]: Failed password for root from 61.177.172.128 port 52596 ssh2
Sep 13 21:14:10 minden010 sshd[32131]: Failed password for root from 61.177.172.128 port 52596 ssh2
Sep 13 21:14:13 minden010 sshd[32131]: Failed password for root from 61.177.172.128 port 52596 ssh2
...

(sshd) Failed SSH login from 138.68.99.46 (DE/Germany/-): 5 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_SSHD; Logs: Sep 13 12:49:04 optimus sshd[3841]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=138.68.99.46  user=root
Sep 13 12:49:06 optimus sshd[3841]: Failed password for root from 138.68.99.46 port 41436 ssh2
Sep 13 12:58:53 optimus sshd[7459]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=138.68.99.46  user=root
Sep 13 12:58:55 optimus sshd[7459]: Failed password for root from 138.68.99.46 port 53490 ssh2
Sep 13 13:04:06 optimus sshd[9215]: Invalid user android from 138.68.99.46

2020-09-13T01:23:24.197139hostname sshd[31944]: Failed password for root from 165.22.69.147 port 57566 ssh2
...

Brute force attack stopped by firewall

(imapd) Failed IMAP login from 98.162.25.28 (US/United States/-): 1 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_TRIGGER; Logs: Sep 13 14:10:55 ir1 dovecot[3110802]: imap-login: Disconnected (auth failed, 1 attempts in 6 secs): user=, method=PLAIN, rip=98.162.25.28, lip=5.63.12.44, TLS, session=<7M2Jti6vla5iohkc>

srvr2: (mod_security) mod_security (id:934100) triggered by 20.36.194.79 (US/-/-): 1 in the last 600 secs; Ports: *; Direction: inout; Trigger: LF_MODSEC; Logs: 2020/09/13 07:52:22 [error] 70302#0: *112258 [client 20.36.194.79] ModSecurity: Access denied with code 406 (phase 2).  [file "/etc/modsecurity.d/REQUEST-934-APPLICATION-ATTACK-NODEJS.conf"] [line "48"] [id "934100"] [rev ""] [msg ""] [redacted] [severity "0"] [ver "OWASP_CRS/3.3.0"] [maturity "0"] [accuracy "0"] [tag "application-multi"] [tag "language-javascript"] [tag "platform-multi"] [tag "attack-rce"] [tag "attack-injection-nodejs"] [tag "paranoia-level/1"] [tag "OWASP_CRS"] [tag "capec/1000/152/242"] [redacted] [uri "/p/i/"] [unique_id "159997634234.076801"] [ref ""], client: 20.36.194.79, [redacted] request: "GET /p/i/?a=">alert(String.fromCharCode(88,83,83))&get=f_26&order=ASC&token=f1c6dd4b95196516b8a5cafed373733de1dafb9d HTTP/1.1" [redacted]

$f2bV_matches