\[2019-10-03 19:55:20\] NOTICE\[1948\] chan_sip.c: Registration from '\' failed for '81.171.58.169:57646' - Wrong password
\[2019-10-03 19:55:20\] SECURITY\[2006\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-10-03T19:55:20.922-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="14637",SessionID="0x7f1e1c18d4b8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/81.171.58.169/57646",Challenge="41c6b477",ReceivedChallenge="41c6b477",ReceivedHash="2e5fa560951e571b7f09e22fee4f44bf"
\[2019-10-03 19:56:09\] NOTICE\[1948\] chan_sip.c: Registration from '\' failed for '81.171.58.169:55961' - Wrong password
\[2019-10-03 19:56:09\] SECURITY\[2006\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-10-03T19:56:09.386-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="10287",SessionID="0x7f1e1c2f44f8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/81.17

\[2019-10-03 14:49:02\] NOTICE\[1948\] chan_sip.c: Registration from '\' failed for '81.171.58.169:52231' - Wrong password
\[2019-10-03 14:49:02\] SECURITY\[2006\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-10-03T14:49:02.044-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="25265",SessionID="0x7f1e1c02d9c8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/81.171.58.169/52231",Challenge="00cc7a4c",ReceivedChallenge="00cc7a4c",ReceivedHash="94e8442ee5d08dada044ff54a8d677c6"
\[2019-10-03 14:49:52\] NOTICE\[1948\] chan_sip.c: Registration from '\' failed for '81.171.58.169:51231' - Wrong password
\[2019-10-03 14:49:52\] SECURITY\[2006\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-10-03T14:49:52.199-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="10027",SessionID="0x7f1e1c2bed58",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/81.17

\[2019-10-02 06:17:15\] NOTICE\[1948\] chan_sip.c: Registration from '\' failed for '81.171.58.169:57370' - Wrong password
\[2019-10-02 06:17:15\] SECURITY\[2006\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-10-02T06:17:15.344-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="19517",SessionID="0x7f1e1c53ea18",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/81.171.58.169/57370",Challenge="28c43c23",ReceivedChallenge="28c43c23",ReceivedHash="aada70f8f75db732e3554136d5b07f4b"
\[2019-10-02 06:17:58\] NOTICE\[1948\] chan_sip.c: Registration from '\' failed for '81.171.58.169:56179' - Wrong password
\[2019-10-02 06:17:58\] SECURITY\[2006\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-10-02T06:17:58.011-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="23041",SessionID="0x7f1e1d0db3e8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/81.17

$f2bV_matches

\[2019-09-27 08:50:00\] NOTICE\[18654\] res_pjsip/pjsip_distributor.c: Request 'REGISTER' from '\' failed for '81.171.58.182:57613' \(callid: 1333370421-481187802-1858144895\) - Failed to authenticate
\[2019-09-27 08:50:00\] SECURITY\[1715\] res_security_log.c: SecurityEvent="ChallengeResponseFailed",EventTV="2019-09-27T08:50:00.668+0200",Severity="Error",Service="PJSIP",EventVersion="1",AccountID="\",SessionID="1333370421-481187802-1858144895",LocalAddress="IPV4/UDP/188.40.118.248/5060",RemoteAddress="IPV4/UDP/81.171.58.182/57613",Challenge="1569567000/7daa4da04e4fcc795dbbb2317fc1c580",Response="2967d15325be825f2c26204e596cd8f7",ExpectedResponse=""
\[2019-09-27 08:50:00\] NOTICE\[1168\] res_pjsip/pjsip_distributor.c: Request 'REGISTER' from '\' failed for '81.171.58.182:57613' \(callid: 1333370421-481187802-1858144895\) - Failed to authenticate
\[2019-09-27 08:50:00\] SECURITY\[1715\] res_security_log.c: SecurityEvent="ChallengeResponseFa

\[2019-09-26 09:30:40\] NOTICE\[14660\] res_pjsip/pjsip_distributor.c: Request 'REGISTER' from '\' failed for '81.171.58.182:64769' \(callid: 1832784954-1306307298-904183106\) - Failed to authenticate
\[2019-09-26 09:30:40\] SECURITY\[1715\] res_security_log.c: SecurityEvent="ChallengeResponseFailed",EventTV="2019-09-26T09:30:40.589+0200",Severity="Error",Service="PJSIP",EventVersion="1",AccountID="\",SessionID="1832784954-1306307298-904183106",LocalAddress="IPV4/UDP/188.40.118.248/5060",RemoteAddress="IPV4/UDP/81.171.58.182/64769",Challenge="1569483040/bdf4b8ac73d03971941b75372ea2e590",Response="f1ef8db92c3dae3a26db31ca2df0a096",ExpectedResponse=""
\[2019-09-26 09:30:40\] NOTICE\[25634\] res_pjsip/pjsip_distributor.c: Request 'REGISTER' from '\' failed for '81.171.58.182:64769' \(callid: 1832784954-1306307298-904183106\) - Failed to authenticate
\[2019-09-26 09:30:40\] SECURITY\[1715\] res_security_log.c: SecurityEvent="ChallengeResponseF

\[2019-09-15 09:23:22\] NOTICE\[20685\] chan_sip.c: Registration from '\' failed for '81.171.58.72:63263' - Wrong password
\[2019-09-15 09:23:22\] SECURITY\[20693\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-09-15T09:23:22.962-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="2276",SessionID="0x7f8a6c255a88",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/81.171.58.72/63263",Challenge="4e55de05",ReceivedChallenge="4e55de05",ReceivedHash="cf04ec34a09d20b3cdc9c852861fec2b"
\[2019-09-15 09:23:50\] NOTICE\[20685\] chan_sip.c: Registration from '\' failed for '81.171.58.72:55571' - Wrong password
\[2019-09-15 09:23:50\] SECURITY\[20693\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-09-15T09:23:50.666-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="888",SessionID="0x7f8a6c6094e8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/81.171.58.

\[2019-09-14 21:52:44\] NOTICE\[20685\] chan_sip.c: Registration from '\' failed for '81.171.58.72:60548' - Wrong password
\[2019-09-14 21:52:44\] SECURITY\[20693\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-09-14T21:52:44.036-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="9520",SessionID="0x7f8a6c6094e8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/81.171.58.72/60548",Challenge="52b9688a",ReceivedChallenge="52b9688a",ReceivedHash="a281472ce410fffe48bc9ccd39403d64"
\[2019-09-14 21:53:09\] NOTICE\[20685\] chan_sip.c: Registration from '\' failed for '81.171.58.72:64462' - Wrong password
\[2019-09-14 21:53:09\] SECURITY\[20693\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-09-14T21:53:09.754-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="5407",SessionID="0x7f8a6c30ae18",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/81.171.5

\[2019-09-13 16:41:25\] NOTICE\[20685\] chan_sip.c: Registration from '\' failed for '81.171.58.72:56754' - Wrong password
\[2019-09-13 16:41:25\] SECURITY\[20693\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-09-13T16:41:25.281-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="9143",SessionID="0x7f8a6c255a88",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/81.171.58.72/56754",Challenge="376670ac",ReceivedChallenge="376670ac",ReceivedHash="434faa32ad2bc81725ec401c7deb8fbf"
\[2019-09-13 16:41:44\] NOTICE\[20685\] chan_sip.c: Registration from '\' failed for '81.171.58.72:64344' - Wrong password
\[2019-09-13 16:41:44\] SECURITY\[20693\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-09-13T16:41:44.033-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="7429",SessionID="0x7f8a6c830888",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/81.171.5

\[2019-09-12 06:18:34\] NOTICE\[1827\] chan_sip.c: Registration from '\' failed for '81.171.58.72:54054' - Wrong password
\[2019-09-12 06:18:34\] SECURITY\[1849\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-09-12T06:18:34.792-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="4583",SessionID="0x7fd9a83796a8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/81.171.58.72/54054",Challenge="59164cdb",ReceivedChallenge="59164cdb",ReceivedHash="f21fdb2cf9af5c0a596e81f517455a4e"
\[2019-09-12 06:18:54\] NOTICE\[1827\] chan_sip.c: Registration from '\' failed for '81.171.58.72:64181' - Wrong password
\[2019-09-12 06:18:54\] SECURITY\[1849\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-09-12T06:18:54.624-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="2638",SessionID="0x7fd9a8545448",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/81.171.58.72

\[2019-09-11 18:50:26\] NOTICE\[1827\] chan_sip.c: Registration from '\' failed for '81.171.58.72:54971' - Wrong password
\[2019-09-11 18:50:26\] SECURITY\[1849\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-09-11T18:50:26.922-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="607",SessionID="0x7fd9a86cbbd8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/81.171.58.72/54971",Challenge="0d0f5554",ReceivedChallenge="0d0f5554",ReceivedHash="10efe34a38d40a417471a14c3864f132"
\[2019-09-11 18:50:49\] NOTICE\[1827\] chan_sip.c: Registration from '\' failed for '81.171.58.72:51668' - Wrong password
\[2019-09-11 18:50:49\] SECURITY\[1849\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-09-11T18:50:49.882-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="8250",SessionID="0x7fd9a819fa08",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/81.171.58.72/5

\[2019-09-10 23:50:29\] NOTICE\[1827\] chan_sip.c: Registration from '\' failed for '81.171.58.72:55568' - Wrong password
\[2019-09-10 23:50:29\] SECURITY\[1849\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-09-10T23:50:29.432-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="1208",SessionID="0x7fd9a80f66a8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/81.171.58.72/55568",Challenge="3c1fdcc0",ReceivedChallenge="3c1fdcc0",ReceivedHash="895b8459047c60e3769489c4be75a7da"
\[2019-09-10 23:50:48\] NOTICE\[1827\] chan_sip.c: Registration from '\' failed for '81.171.58.72:50802' - Wrong password
\[2019-09-10 23:50:48\] SECURITY\[1849\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-09-10T23:50:48.979-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="9432",SessionID="0x7fd9a8c8f538",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/81.171.58.72

Oct 26 03:01:35 gw1 sshd[7039]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=81.12.159.146
Oct 26 03:01:37 gw1 sshd[7039]: Failed password for invalid user oracle from 81.12.159.146 port 45982 ssh2
...

Triggered by Fail2Ban at Vostok web server

Automatic report - Banned IP Access

Oct 26 00:17:27 hosting sshd[28483]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=181.40.73.86  user=root
Oct 26 00:17:29 hosting sshd[28483]: Failed password for root from 181.40.73.86 port 57917 ssh2
...

Oct 25 12:14:38 hanapaa sshd\[18633\]: Invalid user jessica from 149.202.59.85
Oct 25 12:14:38 hanapaa sshd\[18633\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=85.ip-149-202-59.eu
Oct 25 12:14:40 hanapaa sshd\[18633\]: Failed password for invalid user jessica from 149.202.59.85 port 43347 ssh2
Oct 25 12:18:44 hanapaa sshd\[19006\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=85.ip-149-202-59.eu  user=root
Oct 25 12:18:46 hanapaa sshd\[19006\]: Failed password for root from 149.202.59.85 port 34414 ssh2

Oct 25 10:18:36 web1 sshd\[24951\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=165.227.18.169  user=root
Oct 25 10:18:39 web1 sshd\[24951\]: Failed password for root from 165.227.18.169 port 41068 ssh2
Oct 25 10:22:37 web1 sshd\[25298\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=165.227.18.169  user=root
Oct 25 10:22:39 web1 sshd\[25298\]: Failed password for root from 165.227.18.169 port 51428 ssh2
Oct 25 10:26:35 web1 sshd\[25642\]: Invalid user data from 165.227.18.169
Oct 25 10:26:35 web1 sshd\[25642\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=165.227.18.169

" "

Email Subject: 'Look in my eyes. You can see everything there. I'm a woman who can feel.'

F2B jail: sshd. Time: 2019-10-25 23:53:03, Reported by: VKReport

Oct 22 16:54:46 ghostname-secure sshd[22574]: Failed password for invalid user mdnsd from 62.210.72.13 port 45936 ssh2
Oct 22 16:54:46 ghostname-secure sshd[22574]: Received disconnect from 62.210.72.13: 11: Bye Bye [preauth]
Oct 22 17:09:07 ghostname-secure sshd[22884]: Failed password for invalid user loser from 62.210.72.13 port 50742 ssh2
Oct 22 17:09:07 ghostname-secure sshd[22884]: Received disconnect from 62.210.72.13: 11: Bye Bye [preauth]
Oct 22 17:12:45 ghostname-secure sshd[22896]: Failed password for r.r from 62.210.72.13 port 47024 ssh2
Oct 22 17:12:45 ghostname-secure sshd[22896]: Received disconnect from 62.210.72.13: 11: Bye Bye [preauth]
Oct 22 17:17:00 ghostname-secure sshd[22973]: Failed password for r.r from 62.210.72.13 port 50650 ssh2
Oct 22 17:17:00 ghostname-secure sshd[22973]: Received disconnect from 62.210.72.13: 11: Bye Bye [preauth]
Oct 22 17:21:15 ghostname-secure sshd[23085]: Failed password for r.r from 62.210.72.13 port 53788 ssh2
Oct 22........
-------------------------------

" "

2019-10-25T22:04:09.350005hub.schaetter.us sshd\[383\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.175.161  user=root
2019-10-25T22:04:11.657201hub.schaetter.us sshd\[383\]: Failed password for root from 222.186.175.161 port 3762 ssh2
2019-10-25T22:04:15.715455hub.schaetter.us sshd\[383\]: Failed password for root from 222.186.175.161 port 3762 ssh2
2019-10-25T22:04:20.216785hub.schaetter.us sshd\[383\]: Failed password for root from 222.186.175.161 port 3762 ssh2
2019-10-25T22:04:24.507872hub.schaetter.us sshd\[383\]: Failed password for root from 222.186.175.161 port 3762 ssh2
...

Blocked for port scanning.
Time: Fri Oct 25. 18:20:30 2019 +0200
IP: 45.136.109.208 (DE/Germany/-)

Sample of block hits:
Oct 25 18:18:39 vserv kernel: [3185641.907005] Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC= SRC=45.136.109.208 DST=[removed] LEN=40 TOS=0x00 PREC=0x00 TTL=243 ID=11664 PROTO=TCP SPT=52593 DPT=5003 WINDOW=1024 RES=0x00 SYN URGP=0
Oct 25 18:18:41 vserv kernel: [3185643.378997] Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC= SRC=45.136.109.208 DST=[removed] LEN=40 TOS=0x00 PREC=0x00 TTL=243 ID=13469 PROTO=TCP SPT=52593 DPT=63367 WINDOW=1024 RES=0x00 SYN URGP=0
Oct 25 18:18:56 vserv kernel: [3185658.549821] Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC= SRC=45.136.109.208 DST=[removed] LEN=40 TOS=0x00 PREC=0x00 TTL=243 ID=29856 PROTO=TCP SPT=52593 DPT=3448 WINDOW=1024 RES=0x00 SYN URGP=0
Oct 25 18:19:01 vserv kernel: [3185663.635668] Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC= SRC=45.136.109.208 DST=[removed] LEN=40 TOS=0x00 PREC=0x00 TTL=242 ID=34947 PROTO=TCP SPT=52593 DPT=63394 WINDOW

Oct 25 23:28:46 vpn01 sshd[8411]: Failed password for root from 211.137.68.126 port 22672 ssh2
...

Automatic report - Port Scan Attack