\[2019-08-13 22:23:57\] NOTICE\[5713\] res_pjsip/pjsip_distributor.c: Request 'REGISTER' from '\' failed for '77.234.46.145:5987' \(callid: 627922654-1829003958-458813453\) - Failed to authenticate
\[2019-08-13 22:23:57\] SECURITY\[1715\] res_security_log.c: SecurityEvent="ChallengeResponseFailed",EventTV="2019-08-13T22:23:57.475+0200",Severity="Error",Service="PJSIP",EventVersion="1",AccountID="\",SessionID="627922654-1829003958-458813453",LocalAddress="IPV4/UDP/188.40.118.248/5060",RemoteAddress="IPV4/UDP/77.234.46.145/5987",Challenge="1565727837/1f8f0cf151489e941cd77f7763c2fb0a",Response="325d83befecdb5d5dbd7667c28bb7879",ExpectedResponse=""
\[2019-08-13 22:23:57\] NOTICE\[18654\] res_pjsip/pjsip_distributor.c: Request 'REGISTER' from '\' failed for '77.234.46.145:5987' \(callid: 627922654-1829003958-458813453\) - Failed to authenticate
\[2019-08-13 22:23:57\] SECURITY\[1715\] res_security_log.c: SecurityEvent="ChallengeResponseFailed

this person hacked one of my social media accounts and sold it online.

Web App Attack

\[2019-07-05 04:57:44\] NOTICE\[13443\] chan_sip.c: Registration from '\' failed for '77.234.46.193:2790' - Wrong password
\[2019-07-05 04:57:58\] NOTICE\[13443\] chan_sip.c: Registration from '\' failed for '77.234.46.193:2724' - Wrong password
\[2019-07-05 04:58:13\] NOTICE\[13443\] chan_sip.c: Registration from '\' failed for '77.234.46.193:2761' - Wrong password
...

\[2019-07-05 00:22:58\] NOTICE\[13443\] chan_sip.c: Registration from '\' failed for '77.234.46.193:2675' - Wrong password
\[2019-07-05 00:22:58\] SECURITY\[13451\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-07-05T00:22:58.393-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="8090",SessionID="0x7f02f8335788",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/77.234.46.193/63609",Challenge="694c01fe",ReceivedChallenge="694c01fe",ReceivedHash="259209eb0904d2473a2961fd0318ad0f"
\[2019-07-05 00:23:13\] NOTICE\[13443\] chan_sip.c: Registration from '\' failed for '77.234.46.193:2751' - Wrong password
\[2019-07-05 00:23:13\] SECURITY\[13451\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-07-05T00:23:13.994-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="9002",SessionID="0x7f02f869b578",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/77.234.

\[2019-07-04 17:03:45\] NOTICE\[13443\] chan_sip.c: Registration from '\' failed for '77.234.46.193:2759' - Wrong password
\[2019-07-04 17:04:00\] NOTICE\[13443\] chan_sip.c: Registration from '\' failed for '77.234.46.193:2634' - Wrong password
\[2019-07-04 17:04:13\] NOTICE\[13443\] chan_sip.c: Registration from '\' failed for '77.234.46.193:2762' - Wrong password
...

\[2019-07-02 21:20:08\] NOTICE\[13443\] chan_sip.c: Registration from '\' failed for '77.234.46.193:2622' - Wrong password
\[2019-07-02 21:20:08\] SECURITY\[13451\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-07-02T21:20:08.542-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="1011",SessionID="0x7f02f81ae088",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/77.234.46.193/57160",Challenge="7731fff5",ReceivedChallenge="7731fff5",ReceivedHash="08e4d2335f5dd4d3effc102911225033"
\[2019-07-02 21:20:22\] NOTICE\[13443\] chan_sip.c: Registration from '\' failed for '77.234.46.193:2695' - Wrong password
\[2019-07-02 21:20:22\] SECURITY\[13451\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-07-02T21:20:22.815-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="1012",SessionID="0x7f02f810d948",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/77.234.

\[2019-07-02 07:03:32\] NOTICE\[13443\] chan_sip.c: Registration from '\' failed for '77.234.46.193:2782' - Wrong password
\[2019-07-02 07:03:32\] SECURITY\[13451\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-07-02T07:03:32.678-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="999",SessionID="0x7f02f80d17f8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/77.234.46.193/51430",Challenge="07cf4505",ReceivedChallenge="07cf4505",ReceivedHash="2ac3c2b81f182654c439829811ef7668"
\[2019-07-02 07:03:46\] NOTICE\[13443\] chan_sip.c: Registration from '\' failed for '77.234.46.193:2786' - Wrong password
\[2019-07-02 07:03:46\] SECURITY\[13451\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-07-02T07:03:46.438-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="9999",SessionID="0x7f02f82b2728",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/77.234.46

\[2019-07-01 18:33:26\] NOTICE\[13443\] chan_sip.c: Registration from '\' failed for '77.234.46.193:2695' - Wrong password
\[2019-07-01 18:33:26\] SECURITY\[13451\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-07-01T18:33:26.741-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="703",SessionID="0x7f02f810d9f8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/77.234.46.193/59624",Challenge="1b5ac43b",ReceivedChallenge="1b5ac43b",ReceivedHash="f8a18d20149947040bca9e8c82805ee7"
\[2019-07-01 18:33:42\] NOTICE\[13443\] chan_sip.c: Registration from '\' failed for '77.234.46.193:2637' - Wrong password
\[2019-07-01 18:33:42\] SECURITY\[13451\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-07-01T18:33:42.683-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="704",SessionID="0x7f02f81b0978",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/77.234.46.1

\[2019-06-22 00:31:36\] SECURITY\[1857\] res_security_log.c: SecurityEvent="FailedACL",EventTV="2019-06-22T00:31:36.791-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="51900972595146363",SessionID="0x7fc4240077d8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/77.234.46.242/64356",ACLName="no_extension_match"
\[2019-06-22 00:37:47\] SECURITY\[1857\] res_security_log.c: SecurityEvent="FailedACL",EventTV="2019-06-22T00:37:47.727-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="52200972595146363",SessionID="0x7fc4240077d8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/77.234.46.242/61964",ACLName="no_extension_match"
\[2019-06-22 00:39:53\] SECURITY\[1857\] res_security_log.c: SecurityEvent="FailedACL",EventTV="2019-06-22T00:39:53.699-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="52300972595146363",SessionID="0x7fc424003de8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/77.234.46.242/61031",ACLName="

\[2019-06-21 11:34:05\] SECURITY\[2312\] res_security_log.c: SecurityEvent="FailedACL",EventTV="2019-06-21T11:34:05.848-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="14300972595146363",SessionID="0x7fea9c696c38",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/77.234.46.242/61486",ACLName="no_extension_match"
\[2019-06-21 11:36:02\] SECURITY\[2312\] res_security_log.c: SecurityEvent="FailedACL",EventTV="2019-06-21T11:36:02.121-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="14400972595146363",SessionID="0x7fea9d2c8fd8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/77.234.46.242/56037",ACLName="no_extension_match"
\[2019-06-21 11:38:06\] SECURITY\[2312\] res_security_log.c: SecurityEvent="FailedACL",EventTV="2019-06-21T11:38:06.926-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="14500972595146363",SessionID="0x7fea9c696c38",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/77.234.46.242/60306",ACLName="

Automatic report - XMLRPC Attack

Jun 28 08:01:06 piServer sshd[31297]: Failed password for root from 128.199.220.197 port 36334 ssh2
Jun 28 08:04:43 piServer sshd[31584]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=128.199.220.197 
Jun 28 08:04:45 piServer sshd[31584]: Failed password for invalid user rachel from 128.199.220.197 port 35776 ssh2
...

Automatic report - Port Scan Attack

Jun 28 05:53:44 debian-2gb-nbg1-2 kernel: \[15575073.274730\] \[UFW BLOCK\] IN=eth0 OUT= MAC=96:00:00:0e:18:f4:d2:74:7f:6e:37:e3:08:00 SRC=42.114.170.212 DST=195.201.40.59 LEN=130 TOS=0x00 PREC=0x00 TTL=112 ID=47779 PROTO=UDP SPT=52231 DPT=58592 LEN=110

2020-06-27 21:48:22 dovecot_login authenticator failed for \(User\) \[46.38.150.132\]: 535 Incorrect authentication data \(set_id=babylon@no-server.de\)
2020-06-27 21:48:41 dovecot_login authenticator failed for \(User\) \[46.38.150.132\]: 535 Incorrect authentication data \(set_id=gpfd@no-server.de\)
2020-06-27 21:48:42 dovecot_login authenticator failed for \(User\) \[46.38.150.132\]: 535 Incorrect authentication data \(set_id=gpfd@no-server.de\)
2020-06-27 21:48:48 dovecot_login authenticator failed for \(User\) \[46.38.150.132\]: 535 Incorrect authentication data \(set_id=gpfd@no-server.de\)
2020-06-27 21:49:04 dovecot_login authenticator failed for \(User\) \[46.38.150.132\]: 535 Incorrect authentication data \(set_id=gpfd@no-server.de\)
...

unauthorized connection attempt

Jun 28 08:20:13 eventyay sshd[19094]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=139.199.18.200
Jun 28 08:20:15 eventyay sshd[19094]: Failed password for invalid user kerry from 139.199.18.200 port 58510 ssh2
Jun 28 08:23:49 eventyay sshd[19189]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=139.199.18.200
...

Jun 28 08:54:05 PorscheCustomer sshd[10514]: Failed password for root from 155.94.143.151 port 44060 ssh2
Jun 28 09:01:04 PorscheCustomer sshd[10790]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=155.94.143.151
Jun 28 09:01:06 PorscheCustomer sshd[10790]: Failed password for invalid user dai from 155.94.143.151 port 38470 ssh2
...

C2,WP GET /wp/wp-includes/wlwmanifest.xml

2020-06-28T09:11:03.557666ks3355764 sshd[28023]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=52.177.168.23  user=root
2020-06-28T09:11:05.594381ks3355764 sshd[28023]: Failed password for root from 52.177.168.23 port 3034 ssh2
...

Jun 28 05:53:04 debian-2gb-nbg1-2 kernel: \[15575033.282088\] \[UFW BLOCK\] IN=eth0 OUT= MAC=96:00:00:0e:18:f4:d2:74:7f:6e:37:e3:08:00 SRC=49.234.28.165 DST=195.201.40.59 LEN=40 TOS=0x00 PREC=0x00 TTL=235 ID=34225 PROTO=TCP SPT=56264 DPT=2375 WINDOW=1024 RES=0x00 SYN URGP=0

$f2bV_matches

$f2bV_matches | Triggered by Fail2Ban at Vostok web server

$f2bV_matches

Jun 28 08:09:00 electroncash sshd[33256]: Failed password for root from 112.21.188.148 port 55382 ssh2
Jun 28 08:12:59 electroncash sshd[34427]: Invalid user kck from 112.21.188.148 port 39812
Jun 28 08:12:59 electroncash sshd[34427]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=112.21.188.148 
Jun 28 08:12:59 electroncash sshd[34427]: Invalid user kck from 112.21.188.148 port 39812
Jun 28 08:13:00 electroncash sshd[34427]: Failed password for invalid user kck from 112.21.188.148 port 39812 ssh2
...