[2020-09-09 13:27:41] SECURITY[2022] res_security_log.c: SecurityEvent="ChallengeResponseFailed",EventTV="2020-09-09T13:27:41.388+0200",Severity="Error",Service="PJSIP",EventVersion="1",AccountID="",SessionID="518973635-123769044-452640836",LocalAddress="IPV4/UDP/51.255.2.242/5060",RemoteAddress="IPV4/UDP/5.183.92.170/60923",Challenge="1599650861/52198d4167c3a9a00e5d361ee7f02dcd",Response="6532c6282320ff82d1005d4123862644",ExpectedResponse=""
[2020-09-09 13:27:41] SECURITY[2022] res_security_log.c: SecurityEvent="InvalidAccountID",EventTV="2020-09-09T13:27:41.418+0200",Severity="Error",Service="PJSIP",EventVersion="1",AccountID="10",SessionID="518973635-123769044-452640836",LocalAddress="IPV4/UDP/51.255.2.242/5060",RemoteAddress="IPV4/UDP/5.183.92.170/60923"
[2020-09-09 13:27:41] SECURITY[2022] res_security_log.c: SecurityEvent="ChallengeResponseFailed",EventTV="2020-09-09T13:27:41.419+0200",Severity="Error",Service="PJSIP",EventVersion="1",AccountID="",SessionID="518
...

[2020-09-09 13:27:41] SECURITY[2022] res_security_log.c: SecurityEvent="ChallengeResponseFailed",EventTV="2020-09-09T13:27:41.388+0200",Severity="Error",Service="PJSIP",EventVersion="1",AccountID="",SessionID="518973635-123769044-452640836",LocalAddress="IPV4/UDP/51.255.2.242/5060",RemoteAddress="IPV4/UDP/5.183.92.170/60923",Challenge="1599650861/52198d4167c3a9a00e5d361ee7f02dcd",Response="6532c6282320ff82d1005d4123862644",ExpectedResponse=""
[2020-09-09 13:27:41] SECURITY[2022] res_security_log.c: SecurityEvent="InvalidAccountID",EventTV="2020-09-09T13:27:41.418+0200",Severity="Error",Service="PJSIP",EventVersion="1",AccountID="10",SessionID="518973635-123769044-452640836",LocalAddress="IPV4/UDP/51.255.2.242/5060",RemoteAddress="IPV4/UDP/5.183.92.170/60923"
[2020-09-09 13:27:41] SECURITY[2022] res_security_log.c: SecurityEvent="ChallengeResponseFailed",EventTV="2020-09-09T13:27:41.419+0200",Severity="Error",Service="PJSIP",EventVersion="1",AccountID="",SessionID="518
...

[2020-09-09 13:27:41] SECURITY[2022] res_security_log.c: SecurityEvent="ChallengeResponseFailed",EventTV="2020-09-09T13:27:41.388+0200",Severity="Error",Service="PJSIP",EventVersion="1",AccountID="",SessionID="518973635-123769044-452640836",LocalAddress="IPV4/UDP/51.255.2.242/5060",RemoteAddress="IPV4/UDP/5.183.92.170/60923",Challenge="1599650861/52198d4167c3a9a00e5d361ee7f02dcd",Response="6532c6282320ff82d1005d4123862644",ExpectedResponse=""
[2020-09-09 13:27:41] SECURITY[2022] res_security_log.c: SecurityEvent="InvalidAccountID",EventTV="2020-09-09T13:27:41.418+0200",Severity="Error",Service="PJSIP",EventVersion="1",AccountID="10",SessionID="518973635-123769044-452640836",LocalAddress="IPV4/UDP/51.255.2.242/5060",RemoteAddress="IPV4/UDP/5.183.92.170/60923"
[2020-09-09 13:27:41] SECURITY[2022] res_security_log.c: SecurityEvent="ChallengeResponseFailed",EventTV="2020-09-09T13:27:41.419+0200",Severity="Error",Service="PJSIP",EventVersion="1",AccountID="",SessionID="518
...

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[2020-07-16 18:26:05] NOTICE[1277] chan_sip.c: Registration from '"543"' failed for '5.183.92.128:52838' - Wrong password
[2020-07-16 18:26:05] SECURITY[1295] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-07-16T18:26:05.073-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="543",SessionID="0x7f175414cf98",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/5.183.92.128/52838",Challenge="328762d7",ReceivedChallenge="328762d7",ReceivedHash="f154eae596210d6e27e3ca3700e7b8de"
[2020-07-16 18:32:29] NOTICE[1277] chan_sip.c: Registration from '"544"' failed for '5.183.92.128:37339' - Wrong password
[2020-07-16 18:32:29] SECURITY[1295] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-07-16T18:32:29.083-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="544",SessionID="0x7f17540de808",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/5.183.92.1
...

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\[Apr 12 06:53:33\] NOTICE\[2019\] chan_sip.c: Registration from '\' failed for '5.183.92.176:53654' - Wrong password
\[Apr 12 06:54:20\] NOTICE\[2019\] chan_sip.c: Registration from '\' failed for '5.183.92.176:59122' - Wrong password
\[Apr 12 06:54:42\] NOTICE\[2019\] chan_sip.c: Registration from '\' failed for '5.183.92.176:60576' - Wrong password
\[Apr 12 06:54:48\] NOTICE\[2019\] chan_sip.c: Registration from '\' failed for '5.183.92.176:65343' - Wrong password
\[Apr 12 06:55:00\] NOTICE\[2019\] chan_sip.c: Registration from '\' failed for '5.183.92.176:59309' - Wrong password
\[Apr 12 06:55:11\] NOTICE\[2019\] chan_sip.c: Registration from '\' failed for '5.183.92.176:51353' - Wrong password
\[Apr 12 06:55:31\] NOTICE\[2019\] chan_sip.c: Registration from '\' failed for '5.1
...

Has tried to attack my server.

POST /index.php/napisat-nam.html HTTP/1.0 303 - index.phpMozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36 OPR/55.0.2994.44

[2020-02-26 22:38:49] NOTICE[14744] res_pjsip/pjsip_distributor.c: Request 'REGISTER' from '' failed for '5.183.92.32:64598' (callid: 376215522-649646893-389571818) - Failed to authenticate
[2020-02-26 22:38:49] SECURITY[20721] res_security_log.c: SecurityEvent="ChallengeResponseFailed",EventTV="2020-02-26T22:38:49.492+0100",Severity="Error",Service="PJSIP",EventVersion="1",AccountID="",SessionID="376215522-649646893-389571818",LocalAddress="IPV4/UDP/185.118.196.148/5060",RemoteAddress="IPV4/UDP/5.183.92.32/64598",Challenge="1582753129/dad733ecc9e5841b0a1529ab2e7adcda",Response="1de0935f9f82950b6c3e7fb95c212f82",ExpectedResponse=""
[2020-02-26 22:38:49] NOTICE[14744] res_pjsip/pjsip_distributor.c: Request 'REGISTER' from '' failed for '5.183.92.32:64598' (callid: 376215522-649646893-389571818) - Failed to authenticate
[2020-02-26 22:38:49] SECURITY[20721] res_security_log.c: SecurityEvent="ChallengeResponseFailed",EventTV="2020-02-26T22:38:49.563+0

2019-11-14T22:38:37.131171abusebot-5.cloudsearch.cf sshd\[9091\]: Invalid user administrador from 193.112.191.228 port 37050

Nov 14 23:44:18 MainVPS sshd[32031]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.175.148  user=root
Nov 14 23:44:19 MainVPS sshd[32031]: Failed password for root from 222.186.175.148 port 34102 ssh2
Nov 14 23:44:32 MainVPS sshd[32031]: error: maximum authentication attempts exceeded for root from 222.186.175.148 port 34102 ssh2 [preauth]
Nov 14 23:44:18 MainVPS sshd[32031]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.175.148  user=root
Nov 14 23:44:19 MainVPS sshd[32031]: Failed password for root from 222.186.175.148 port 34102 ssh2
Nov 14 23:44:32 MainVPS sshd[32031]: error: maximum authentication attempts exceeded for root from 222.186.175.148 port 34102 ssh2 [preauth]
Nov 14 23:44:36 MainVPS sshd[419]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.175.148  user=root
Nov 14 23:44:38 MainVPS sshd[419]: Failed password for root from 222.186.175.148 port 4036

Nov 14 22:38:32 marvibiene sshd[42661]: Invalid user ftp from 128.106.195.126 port 53743
Nov 14 22:38:32 marvibiene sshd[42661]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=128.106.195.126
Nov 14 22:38:32 marvibiene sshd[42661]: Invalid user ftp from 128.106.195.126 port 53743
Nov 14 22:38:35 marvibiene sshd[42661]: Failed password for invalid user ftp from 128.106.195.126 port 53743 ssh2
...

2019-11-14T22:43:38.975353abusebot-3.cloudsearch.cf sshd\[4319\]: Invalid user guest from 123.207.108.89 port 50600

Nov 14 23:38:39 localhost sshd\[20747\]: Invalid user arjunasa from 59.120.189.234 port 50308
Nov 14 23:38:39 localhost sshd\[20747\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=59.120.189.234
Nov 14 23:38:42 localhost sshd\[20747\]: Failed password for invalid user arjunasa from 59.120.189.234 port 50308 ssh2

Brute force attempt

2019-11-14T23:04:54.201473abusebot-4.cloudsearch.cf sshd\[4626\]: Invalid user vicosa from 111.93.94.10 port 45850

Invalid user admin from 210.126.1.36 port 35372

Nov 14 23:33:29 sd-53420 sshd\[20681\]: Invalid user www from 213.32.91.37
Nov 14 23:33:29 sd-53420 sshd\[20681\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=213.32.91.37
Nov 14 23:33:31 sd-53420 sshd\[20681\]: Failed password for invalid user www from 213.32.91.37 port 36548 ssh2
Nov 14 23:38:24 sd-53420 sshd\[22050\]: Invalid user chansik from 213.32.91.37
Nov 14 23:38:24 sd-53420 sshd\[22050\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=213.32.91.37
...

Nov 14 23:38:18 SilenceServices sshd[17151]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=178.128.217.135
Nov 14 23:38:20 SilenceServices sshd[17151]: Failed password for invalid user zabidin from 178.128.217.135 port 33496 ssh2

Nov 14 23:34:25 mail1 sshd\[29651\]: Invalid user admin from 213.194.135.161 port 49478
Nov 14 23:34:25 mail1 sshd\[29651\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=213.194.135.161
Nov 14 23:34:27 mail1 sshd\[29651\]: Failed password for invalid user admin from 213.194.135.161 port 49478 ssh2
Nov 14 23:38:08 mail1 sshd\[31343\]: Invalid user ubuntu from 213.194.135.161 port 50504
Nov 14 23:38:08 mail1 sshd\[31343\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=213.194.135.161
...

Nov 14 17:38:13 TORMINT sshd\[15497\]: Invalid user Server from 180.76.249.74
Nov 14 17:38:13 TORMINT sshd\[15497\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=180.76.249.74
Nov 14 17:38:15 TORMINT sshd\[15497\]: Failed password for invalid user Server from 180.76.249.74 port 44400 ssh2
...

Brute force attempt

Fail2Ban Ban Triggered

2019-11-14T22:59:02.223585shield sshd\[14463\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.88.112.71  user=root
2019-11-14T22:59:03.906796shield sshd\[14463\]: Failed password for root from 49.88.112.71 port 64358 ssh2
2019-11-14T22:59:05.753355shield sshd\[14463\]: Failed password for root from 49.88.112.71 port 64358 ssh2
2019-11-14T22:59:08.071790shield sshd\[14463\]: Failed password for root from 49.88.112.71 port 64358 ssh2
2019-11-14T22:59:38.199815shield sshd\[14666\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.88.112.71  user=root