Apr 17 15:25:18 mail sshd[30759]: Invalid user admin from 51.15.149.20
Apr 17 15:25:18 mail sshd[30759]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.15.149.20
Apr 17 15:25:18 mail sshd[30759]: Invalid user admin from 51.15.149.20
Apr 17 15:25:21 mail sshd[30759]: Failed password for invalid user admin from 51.15.149.20 port 60368 ssh2
Apr 18 10:37:55 mail sshd[30131]: Invalid user ubuntu from 51.15.149.20
...

Mar  5 21:50:43 gw1 sshd[23851]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.15.149.20
Mar  5 21:50:45 gw1 sshd[23851]: Failed password for invalid user guest from 51.15.149.20 port 56904 ssh2
...

Mar  5 15:25:38 gw1 sshd[2905]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.15.149.20
Mar  5 15:25:40 gw1 sshd[2905]: Failed password for invalid user ftpuser from 51.15.149.20 port 37878 ssh2
...

Mar  3 14:25:01 MK-Soft-Root1 sshd[4191]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.15.149.20 
Mar  3 14:25:03 MK-Soft-Root1 sshd[4191]: Failed password for invalid user magda from 51.15.149.20 port 42942 ssh2
...

2020-02-27T23:00:05.804332shield sshd\[1249\]: Invalid user azureuser from 51.15.149.20 port 49448
2020-02-27T23:00:05.809521shield sshd\[1249\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=kali.ironie.org
2020-02-27T23:00:07.739236shield sshd\[1249\]: Failed password for invalid user azureuser from 51.15.149.20 port 49448 ssh2
2020-02-27T23:04:12.041713shield sshd\[2059\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=kali.ironie.org  user=root
2020-02-27T23:04:14.210900shield sshd\[2059\]: Failed password for root from 51.15.149.20 port 43604 ssh2

Feb 18 14:50:38 sd-53420 sshd\[3555\]: Invalid user spam from 51.15.149.20
Feb 18 14:50:38 sd-53420 sshd\[3555\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.15.149.20
Feb 18 14:50:39 sd-53420 sshd\[3555\]: Failed password for invalid user spam from 51.15.149.20 port 54672 ssh2
Feb 18 14:52:10 sd-53420 sshd\[3692\]: Invalid user ubuntu from 51.15.149.20
Feb 18 14:52:10 sd-53420 sshd\[3692\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.15.149.20
...

Feb  8 03:31:51 MK-Soft-VM8 sshd[1628]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.15.149.20 
Feb  8 03:31:54 MK-Soft-VM8 sshd[1628]: Failed password for invalid user ecm from 51.15.149.20 port 36356 ssh2
...

Unauthorized connection attempt detected from IP address 51.15.149.20 to port 2220 [J]

\[2019-12-25 16:34:58\] NOTICE\[2839\] chan_sip.c: Registration from '"334"\' failed for '51.15.149.58:8848' - Wrong password
\[2019-12-25 16:34:58\] SECURITY\[2857\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-12-25T16:34:58.182-0500",Severity="Error",Service="SIP",EventVersion="2",AccountID="334",SessionID="0x7f0fb4bb5cd8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/51.15.149.58/8848",Challenge="54fe712d",ReceivedChallenge="54fe712d",ReceivedHash="df3016c9588b46e108e8950849c78976"
\[2019-12-25 16:36:34\] NOTICE\[2839\] chan_sip.c: Registration from '"336"\' failed for '51.15.149.58:8962' - Wrong password
\[2019-12-25 16:36:34\] SECURITY\[2857\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-12-25T16:36:34.419-0500",Severity="Error",Service="SIP",EventVersion="2",AccountID="336",SessionID="0x7f0fb4bb5cd8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/51.15.149

\[2019-12-25 03:41:40\] NOTICE\[2839\] chan_sip.c: Registration from '"328"\' failed for '51.15.149.58:8341' - Wrong password
\[2019-12-25 03:41:40\] SECURITY\[2857\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-12-25T03:41:40.270-0500",Severity="Error",Service="SIP",EventVersion="2",AccountID="328",SessionID="0x7f0fb499d728",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/51.15.149.58/8341",Challenge="5682896a",ReceivedChallenge="5682896a",ReceivedHash="52fcee648fef1c78e6b2c46fe89ed945"
\[2019-12-25 03:42:38\] NOTICE\[2839\] chan_sip.c: Registration from '"328"\' failed for '51.15.149.58:8399' - Wrong password
\[2019-12-25 03:42:38\] SECURITY\[2857\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-12-25T03:42:38.370-0500",Severity="Error",Service="SIP",EventVersion="2",AccountID="328",SessionID="0x7f0fb499d728",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/51.15.149

\[2019-12-18 05:13:09\] NOTICE\[2839\] chan_sip.c: Registration from '"213"\' failed for '51.15.149.58:7992' - Wrong password
\[2019-12-18 05:13:09\] SECURITY\[2857\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-12-18T05:13:09.117-0500",Severity="Error",Service="SIP",EventVersion="2",AccountID="213",SessionID="0x7f0fb406f938",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/51.15.149.58/7992",Challenge="284c3d6e",ReceivedChallenge="284c3d6e",ReceivedHash="589caa4c0607c2900169a750a6493564"
\[2019-12-18 05:13:28\] NOTICE\[2839\] chan_sip.c: Registration from '"213"\' failed for '51.15.149.58:8040' - Wrong password
\[2019-12-18 05:13:28\] SECURITY\[2857\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-12-18T05:13:28.987-0500",Severity="Error",Service="SIP",EventVersion="2",AccountID="213",SessionID="0x7f0fb4121288",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/51.15.149

\[2019-12-16 16:14:55\] NOTICE\[2839\] chan_sip.c: Registration from '"187"\' failed for '51.15.149.58:5930' - Wrong password
\[2019-12-16 16:14:55\] SECURITY\[2857\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-12-16T16:14:55.277-0500",Severity="Error",Service="SIP",EventVersion="2",AccountID="187",SessionID="0x7f0fb4a5a908",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/51.15.149.58/5930",Challenge="0a2b5789",ReceivedChallenge="0a2b5789",ReceivedHash="74e8abeb0988101bd06f92f6950cbf11"
\[2019-12-16 16:15:15\] NOTICE\[2839\] chan_sip.c: Registration from '"188"\' failed for '51.15.149.58:5985' - Wrong password
\[2019-12-16 16:15:15\] SECURITY\[2857\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-12-16T16:15:15.817-0500",Severity="Error",Service="SIP",EventVersion="2",AccountID="188",SessionID="0x7f0fb47c90d8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/51.15.149

VoIP Brute Force - 51.15.149.58 - Auto Report
...

Invalid user zhang from 119.28.227.100 port 49946

srvr3: (mod_security) mod_security (id:920350) triggered by 46.217.139.137 (MK/-/-): 1 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_MODSEC; Logs: 2020/10/02 22:39:57 [error] 70998#0: *410 [client 46.217.139.137] ModSecurity: Access denied with code 406 (phase 2). Matched "Operator `Rx' with parameter `^[\d.:]+$' against variable `REQUEST_HEADERS:Host'  [redacted] [file "/etc/modsecurity.d/REQUEST-920-PROTOCOL-ENFORCEMENT.conf"] [line "718"] [id "920350"] [rev ""] [msg "Host header is a numeric IP address"] [redacted] [severity "4"] [ver "OWASP_CRS/3.3.0"] [maturity "0"] [accuracy "0"] [tag "application-multi"] [tag "language-multi"] [tag "platform-multi"] [tag "attack-protocol"] [tag "paranoia-level/1"] [tag "OWASP_CRS"] [tag "capec/1000/210/272"] [tag "PCI/6.5.10"] [redacted] [uri "/"] [unique_id "160167119767.124272"] [ref "o0,14v21,14"], client: 46.217.139.137, [redacted] request: "GET / HTTP/1.1" [redacted]

Invalid user switch from 157.230.245.91 port 43234

Oct  3 13:52:02 vps639187 sshd\[326\]: Invalid user miles from 220.247.201.109 port 57650
Oct  3 13:52:02 vps639187 sshd\[326\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=220.247.201.109
Oct  3 13:52:03 vps639187 sshd\[326\]: Failed password for invalid user miles from 220.247.201.109 port 57650 ssh2
...

Oct  3 13:21:46 minden010 sshd[32083]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=154.209.228.177
Oct  3 13:21:48 minden010 sshd[32083]: Failed password for invalid user developer from 154.209.228.177 port 58532 ssh2
Oct  3 13:28:32 minden010 sshd[1732]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=154.209.228.177
...

Oct  3 19:39:00 itv-usvr-01 sshd[23651]: Invalid user ftp from 114.35.44.253
Oct  3 19:39:00 itv-usvr-01 sshd[23651]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=114.35.44.253
Oct  3 19:39:00 itv-usvr-01 sshd[23651]: Invalid user ftp from 114.35.44.253
Oct  3 19:39:02 itv-usvr-01 sshd[23651]: Failed password for invalid user ftp from 114.35.44.253 port 56314 ssh2
Oct  3 19:47:51 itv-usvr-01 sshd[24150]: Invalid user elasticsearch from 114.35.44.253

Rude login attack (8 tries in 1d)

scans once in preceeding hours on the ports (in chronological order) 5802 resulting in total of 3 scans from 64.227.0.0/17 block.

Oct  3 03:58:11 web1 sshd\[18857\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.51.80.198  user=root
Oct  3 03:58:14 web1 sshd\[18857\]: Failed password for root from 106.51.80.198 port 49408 ssh2
Oct  3 04:02:18 web1 sshd\[19173\]: Invalid user git from 106.51.80.198
Oct  3 04:02:18 web1 sshd\[19173\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.51.80.198
Oct  3 04:02:21 web1 sshd\[19173\]: Failed password for invalid user git from 106.51.80.198 port 55450 ssh2

RU spamvertising, health fraud - From: GlucaFIX 

UBE 185.176.220.179 (EHLO gopxk.imkeeperr.com) 2 Cloud Ltd.

Spam link redfloppy.com = 185.246.116.174 Vpsville LLC – phishing redirect:
a) aptrk13.com = 35.204.93.160 Google
b) www.ep20trk.com = 34.120.202.146 Google
c) www.glucafix.us = 104.27.187.98, 104.27.186.98, 172.67.201.182 Cloudflare
d) glucafix.us = ditto

Images - 
- http://redfloppy.com/web/imgs/mi1tb6fg.png = dailybetterhealth.com = 104.27.138.27, 104.27.139.27, 172.67.218.161 Cloudflare
- http://redfloppy.com/web/imgs/24sc48jt.png = unsub; no entity/address

scans 2 times in preceeding hours on the ports (in chronological order) 7102 7102

Oct  3 14:26:24 prox sshd[31838]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=103.199.98.220 
Oct  3 14:26:26 prox sshd[31838]: Failed password for invalid user marjorie from 103.199.98.220 port 39002 ssh2

Port 22 Scan, PTR: None

(sshd) Failed SSH login from 106.12.36.3 (CN/China/-): 5 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_SSHD; Logs: Oct  3 06:46:58 optimus sshd[9295]: Invalid user zhao from 106.12.36.3
Oct  3 06:46:58 optimus sshd[9295]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.12.36.3 
Oct  3 06:47:00 optimus sshd[9295]: Failed password for invalid user zhao from 106.12.36.3 port 32966 ssh2
Oct  3 06:51:10 optimus sshd[15552]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.12.36.3  user=root
Oct  3 06:51:11 optimus sshd[15552]: Failed password for root from 106.12.36.3 port 38006 ssh2

 TCP (SYN) 74.120.14.78:19134 -> port 9441, len 44