Apr 17 01:20:47 icinga sshd[28613]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=165.22.97.17 
Apr 17 01:20:48 icinga sshd[28613]: Failed password for invalid user hl from 165.22.97.17 port 60020 ssh2
Apr 17 01:31:27 icinga sshd[45855]: Failed password for root from 165.22.97.17 port 56018 ssh2
...

Apr 16 23:31:36 work-partkepr sshd\[619\]: Invalid user test from 52.170.80.49 port 42198
Apr 16 23:31:36 work-partkepr sshd\[619\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=52.170.80.49
...

Apr 17 01:53:19 srv01 postfix/smtpd\[20225\]: warning: unknown\[45.125.65.35\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr 17 01:54:35 srv01 postfix/smtpd\[24676\]: warning: unknown\[45.125.65.35\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr 17 01:54:55 srv01 postfix/smtpd\[20225\]: warning: unknown\[45.125.65.35\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr 17 01:55:03 srv01 postfix/smtpd\[20956\]: warning: unknown\[45.125.65.35\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr 17 02:04:10 srv01 postfix/smtpd\[24671\]: warning: unknown\[45.125.65.35\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

2020-04-17T01:31:29.537494  sshd[10981]: Invalid user anil from 204.48.27.62 port 47744
2020-04-17T01:31:29.551364  sshd[10981]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=204.48.27.62
2020-04-17T01:31:29.537494  sshd[10981]: Invalid user anil from 204.48.27.62 port 47744
2020-04-17T01:31:31.661458  sshd[10981]: Failed password for invalid user anil from 204.48.27.62 port 47744 ssh2
...

Apr 17 01:31:39 ourumov-web sshd\[29569\]: Invalid user dr from 103.231.70.170 port 54064
Apr 17 01:31:39 ourumov-web sshd\[29569\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=103.231.70.170
Apr 17 01:31:41 ourumov-web sshd\[29569\]: Failed password for invalid user dr from 103.231.70.170 port 54064 ssh2
...

Tried more than 140 times to hack my QNAP server by login with “admin” account
Solution: make sure to create another account with admin privileges and disable “admin”

Apr 17 01:23:15 prox sshd[16810]: Failed password for root from 218.240.137.68 port 43630 ssh2
Apr 17 01:33:54 prox sshd[10969]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=218.240.137.68

Unauthorized connection attempt from IP address 190.85.152.129 on Port 445(SMB)

[2020-04-16 20:12:20] NOTICE[1170] chan_sip.c: Registration from '"400"' failed for '212.129.50.137:8162' - Wrong password
[2020-04-16 20:12:20] SECURITY[1184] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-04-16T20:12:20.896-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="400",SessionID="0x7f6c08341c08",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/212.129.50.137/8162",Challenge="44a63db9",ReceivedChallenge="44a63db9",ReceivedHash="70ce35027082cd722d7062e31dc87e61"
[2020-04-16 20:13:05] NOTICE[1170] chan_sip.c: Registration from '"401"' failed for '212.129.50.137:8215' - Wrong password
[2020-04-16 20:13:05] SECURITY[1184] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-04-16T20:13:05.269-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="401",SessionID="0x7f6c0824ccd8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/212.129
...

Bruteforce detected by fail2ban

Apr 17 02:25:32 pkdns2 sshd\[5114\]: Invalid user xt from 62.28.253.197Apr 17 02:25:34 pkdns2 sshd\[5114\]: Failed password for invalid user xt from 62.28.253.197 port 37569 ssh2Apr 17 02:29:22 pkdns2 sshd\[5274\]: Invalid user cg from 62.28.253.197Apr 17 02:29:24 pkdns2 sshd\[5274\]: Failed password for invalid user cg from 62.28.253.197 port 16641 ssh2Apr 17 02:33:13 pkdns2 sshd\[5472\]: Invalid user cw from 62.28.253.197Apr 17 02:33:15 pkdns2 sshd\[5472\]: Failed password for invalid user cw from 62.28.253.197 port 18145 ssh2
...

Apr 17 01:30:04 vps647732 sshd[21909]: Failed password for root from 31.46.16.95 port 36344 ssh2
Apr 17 01:31:57 vps647732 sshd[22084]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=31.46.16.95
...

(LocalIPAttack) Local IP Attack From  197.59.110.129 (EG/Egypt/host-197.59.110.129.tedata.net): 1 in the last 3600 secs

2020-04-17T02:14:07.240719sd-86998 sshd[8164]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.31.166  user=root
2020-04-17T02:14:08.853465sd-86998 sshd[8164]: Failed password for root from 222.186.31.166 port 46335 ssh2
2020-04-17T02:14:11.689524sd-86998 sshd[8164]: Failed password for root from 222.186.31.166 port 46335 ssh2
2020-04-17T02:14:07.240719sd-86998 sshd[8164]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.31.166  user=root
2020-04-17T02:14:08.853465sd-86998 sshd[8164]: Failed password for root from 222.186.31.166 port 46335 ssh2
2020-04-17T02:14:11.689524sd-86998 sshd[8164]: Failed password for root from 222.186.31.166 port 46335 ssh2
2020-04-17T02:14:07.240719sd-86998 sshd[8164]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.31.166  user=root
2020-04-17T02:14:08.853465sd-86998 sshd[8164]: Failed password for root from 222.186.
...

Apr 16 23:52:44 game-panel sshd[14931]: Failed password for root from 218.92.0.184 port 4901 ssh2
Apr 16 23:52:46 game-panel sshd[14931]: Failed password for root from 218.92.0.184 port 4901 ssh2
Apr 16 23:52:56 game-panel sshd[14931]: error: maximum authentication attempts exceeded for root from 218.92.0.184 port 4901 ssh2 [preauth]