May 31 08:48:01 server dovecot: imap-login: Aborted login (auth failed, 1 attempts in 2 secs): user=, method=PLAIN, rip=2a02:a03f:3ea0:9200:3096:e4a5:302c:e5ea, lip=2a01:7e01:e001:164::, session=
May 31 08:48:07 server dovecot: imap-login: Aborted login (auth failed, 1 attempts in 6 secs): user=, method=PLAIN, rip=2a02:a03f:3ea0:9200:3096:e4a5:302c:e5ea, lip=2a01:7e01:e001:164::, session=<6fs1D+ym6/0qAqA/PqCSADCW5KUwLOXq>
May 31 08:48:07 server dovecot: imap-login: Aborted login (auth failed, 1 attempts in 6 secs): user=, method=PLAIN, rip=2a02:a03f:3ea0:9200:3096:e4a5:302c:e5ea, lip=2a01:7e01:e001:164::, session=
May 31 08:48:18 server dovecot: imap-login: Aborted login (auth failed, 1 attempts in 6 secs): user=, method=PLAIN, rip=2a02:a03f:3ea0:9200:3096:e4a5:302c:e5ea, lip=2a01:7e01:e001:164::, session=

firewall-block, port(s): 445/tcp

Directory traversal

Unauthorized connection attempt from IP address 67.254.138.138 on Port 445(SMB)

Distributed brute force attack

2019-07-11T05:57:23.434059cavecanem sshd[25749]: Invalid user operatore from 90.89.20.230 port 39544
2019-07-11T05:57:23.436313cavecanem sshd[25749]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=90.89.20.230
2019-07-11T05:57:23.434059cavecanem sshd[25749]: Invalid user operatore from 90.89.20.230 port 39544
2019-07-11T05:57:25.282894cavecanem sshd[25749]: Failed password for invalid user operatore from 90.89.20.230 port 39544 ssh2
2019-07-11T06:00:53.446040cavecanem sshd[26761]: Invalid user hou from 90.89.20.230 port 41652
2019-07-11T06:00:53.448860cavecanem sshd[26761]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=90.89.20.230
2019-07-11T06:00:53.446040cavecanem sshd[26761]: Invalid user hou from 90.89.20.230 port 41652
2019-07-11T06:00:55.124028cavecanem sshd[26761]: Failed password for invalid user hou from 90.89.20.230 port 41652 ssh2
2019-07-11T06:03:14.848096cavecanem sshd[27413]: pam_unix(sshd
...

Jul 11 04:25:06 marvibiene sshd[43889]: Invalid user admin from 115.165.0.224 port 41284
Jul 11 04:25:06 marvibiene sshd[43889]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=115.165.0.224
Jul 11 04:25:06 marvibiene sshd[43889]: Invalid user admin from 115.165.0.224 port 41284
Jul 11 04:25:08 marvibiene sshd[43889]: Failed password for invalid user admin from 115.165.0.224 port 41284 ssh2
...

Unauthorized connection attempt from IP address 139.255.38.133 on Port 445(SMB)

2019-07-11T09:51:37.536000ns1.unifynetsol.net postfix/smtpd\[8131\]: warning: unknown\[45.13.39.19\]: SASL LOGIN authentication failed: authentication failure
2019-07-11T09:52:16.002582ns1.unifynetsol.net postfix/smtpd\[1310\]: warning: unknown\[45.13.39.19\]: SASL LOGIN authentication failed: authentication failure
2019-07-11T09:52:53.495722ns1.unifynetsol.net postfix/smtpd\[1310\]: warning: unknown\[45.13.39.19\]: SASL LOGIN authentication failed: authentication failure
2019-07-11T09:53:30.002461ns1.unifynetsol.net postfix/smtpd\[8131\]: warning: unknown\[45.13.39.19\]: SASL LOGIN authentication failed: authentication failure
2019-07-11T09:54:07.918027ns1.unifynetsol.net postfix/smtpd\[8131\]: warning: unknown\[45.13.39.19\]: SASL LOGIN authentication failed: authentication failure

Jul 11 05:02:44 localhost sshd\[1064\]: Invalid user zj from 51.79.129.235 port 37250
Jul 11 05:02:44 localhost sshd\[1064\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.79.129.235
...

\[2019-07-11 06:00:39\] NOTICE\[5109\] res_pjsip/pjsip_distributor.c: Request 'REGISTER' from '\' failed for '176.126.83.22:1342' \(callid: 594772244-171188596-661381393\) - Failed to authenticate
\[2019-07-11 06:00:39\] SECURITY\[3671\] res_security_log.c: SecurityEvent="ChallengeResponseFailed",EventTV="2019-07-11T06:00:39.763+0200",Severity="Error",Service="PJSIP",EventVersion="1",AccountID="\",SessionID="594772244-171188596-661381393",LocalAddress="IPV4/UDP/188.40.118.248/5060",RemoteAddress="IPV4/UDP/176.126.83.22/1342",Challenge="1562817639/e7b7e9042af6eb6ff5840551db30d5ff",Response="32acb31c2ac944806a34fb7446c46292",ExpectedResponse=""
\[2019-07-11 06:00:39\] NOTICE\[9010\] res_pjsip/pjsip_distributor.c: Request 'REGISTER' from '\' failed for '176.126.83.22:1342' \(callid: 594772244-171188596-661381393\) - Failed to authenticate
\[2019-07-11 06:00:39\] SECURITY\[3671\] res_security_log.c: SecurityEvent="ChallengeResponseFailed",

Telnet/23 MH Probe, BF, Hack -

Jul 11 11:00:25 itv-usvr-01 sshd[12782]: Invalid user support from 121.123.236.94
Jul 11 11:00:52 itv-usvr-01 sshd[12782]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.123.236.94
Jul 11 11:00:25 itv-usvr-01 sshd[12782]: Invalid user support from 121.123.236.94
Jul 11 11:00:54 itv-usvr-01 sshd[12782]: Failed password for invalid user support from 121.123.236.94 port 56270 ssh2
Jul 11 11:01:17 itv-usvr-01 sshd[12860]: Invalid user cisco from 121.123.236.94

Jul 11 06:01:03 xeon cyrus/imaps[14411]: badlogin: [60.6.214.48] plain [SASL(-13): authentication failure: Password verification failed]

Unauthorized connection attempt from IP address 124.123.108.147 on Port 445(SMB)

2019-07-11T06:02:33.244723scmdmz1 sshd\[18571\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=23.129.64.188  user=admin
2019-07-11T06:02:35.317081scmdmz1 sshd\[18571\]: Failed password for admin from 23.129.64.188 port 46372 ssh2
2019-07-11T06:02:41.471546scmdmz1 sshd\[18573\]: Invalid user admin1 from 23.129.64.188 port 57933
...