Mar 30 19:19:53 web1 sshd\[1424\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=211.108.106.1  user=root
Mar 30 19:19:55 web1 sshd\[1424\]: Failed password for root from 211.108.106.1 port 59200 ssh2
Mar 30 19:23:29 web1 sshd\[1821\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=211.108.106.1  user=root
Mar 30 19:23:30 web1 sshd\[1821\]: Failed password for root from 211.108.106.1 port 50682 ssh2
Mar 30 19:27:18 web1 sshd\[2220\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=211.108.106.1  user=root

Mar 30 19:55:00 sachi sshd\[18845\]: Invalid user pb from 103.108.144.245
Mar 30 19:55:00 sachi sshd\[18845\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=103.108.144.245
Mar 30 19:55:02 sachi sshd\[18845\]: Failed password for invalid user pb from 103.108.144.245 port 36046 ssh2
Mar 30 19:59:46 sachi sshd\[19211\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=103.108.144.245  user=root
Mar 30 19:59:48 sachi sshd\[19211\]: Failed password for root from 103.108.144.245 port 40765 ssh2

Mar 31 05:54:05 debian-2gb-nbg1-2 kernel: \[7885899.480484\] \[UFW BLOCK\] IN=eth0 OUT= MAC=96:00:00:0e:18:f4:d2:74:7f:6e:37:e3:08:00 SRC=104.64.132.93 DST=195.201.40.59 LEN=44 TOS=0x00 PREC=0x00 TTL=44 ID=0 DF PROTO=TCP SPT=80 DPT=64153 WINDOW=29200 RES=0x00 ACK SYN URGP=0

Try to reach: 
/.env
/administrator
/plugins/system/debug/debug.xml
/administrator/language/en-GB/install.xml
/administrator/help/en-GB/toc.json

{"cdn-loop":["cloudflare"],"cf-connecting-ip":["82.165.158.242"],"user-agent":["Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0"],"accept":["*/*"],"cf-visitor":["{\\"scheme\\":\\"https\\"}"],"x-forwarded-proto":["https"],"cf-ipcountry":["DE"],"accept-encoding":["gzip"],"connection":["close"],"x-forwarded-for":["82.165.158.242, 82.165.158.242"]]}

$f2bV_matches

Unauthorized connection attempt from IP address 123.17.85.228 on Port 445(SMB)

2020-03-28 10:04:51 server sshd[56403]: Failed password for invalid user user from 106.54.3.80 port 49136 ssh2

Mar 31 05:53:27 debian-2gb-nbg1-2 kernel: \[7885861.660198\] \[UFW BLOCK\] IN=eth0 OUT= MAC=96:00:00:0e:18:f4:d2:74:7f:6e:37:e3:08:00 SRC=52.194.11.204 DST=195.201.40.59 LEN=44 TOS=0x08 PREC=0x00 TTL=228 ID=0 DF PROTO=TCP SPT=443 DPT=47676 WINDOW=26883 RES=0x00 ACK SYN URGP=0

[2020-03-31 01:48:33] NOTICE[1148] chan_sip.c: Registration from '"410" ' failed for '116.202.203.130:6852' - Wrong password
[2020-03-31 01:48:33] SECURITY[1163] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-03-31T01:48:33.785-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="410",SessionID="0x7fd82c538db8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/116.202.203.130/6852",Challenge="16cd9ba7",ReceivedChallenge="16cd9ba7",ReceivedHash="86fc46e46eebf47d7ccca93901737658"
[2020-03-31 01:48:33] NOTICE[1148] chan_sip.c: Registration from '"410" ' failed for '116.202.203.130:6852' - Wrong password
[2020-03-31 01:48:33] SECURITY[1163] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-03-31T01:48:33.913-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="410",SessionID="0x7fd82cf70e38",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/11
...

Lines containing failures of 51.178.53.238
Mar 31 00:04:09 shared02 sshd[5558]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.178.53.238  user=r.r
Mar 31 00:04:11 shared02 sshd[5558]: Failed password for r.r from 51.178.53.238 port 34846 ssh2
Mar 31 00:04:11 shared02 sshd[5558]: Received disconnect from 51.178.53.238 port 34846:11: Bye Bye [preauth]
Mar 31 00:04:11 shared02 sshd[5558]: Disconnected from authenticating user r.r 51.178.53.238 port 34846 [preauth]
Mar 31 00:15:32 shared02 sshd[13430]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.178.53.238  user=r.r
Mar 31 00:15:34 shared02 sshd[13430]: Failed password for r.r from 51.178.53.238 port 35126 ssh2
Mar 31 00:15:34 shared02 sshd[13430]: Received disconnect from 51.178.53.238 port 35126:11: Bye Bye [preauth]
Mar 31 00:15:34 shared02 sshd[13430]: Disconnected from authenticating user r.r 51.178.53.238 port 35126 [preauth]
Ma........
------------------------------

2020-03-31T05:53:18.714493jannga.de sshd[21222]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=152.136.86.234  user=root
2020-03-31T05:53:20.740671jannga.de sshd[21222]: Failed password for root from 152.136.86.234 port 39529 ssh2
...

Automatic report - Port Scan Attack

failed_logins

1585626810 - 03/31/2020 05:53:30 Host: 14.228.186.184/14.228.186.184 Port: 445 TCP Blocked

03/31/2020-00:00:38.680466 129.28.188.115 Protocol: 6 ET SCAN Potential SSH Scan