Sep  9 04:39:37 mail.srvfarm.net postfix/smtpd[2229826]: warning: unknown[189.91.7.87]: SASL PLAIN authentication failed: 
Sep  9 04:39:38 mail.srvfarm.net postfix/smtpd[2229826]: lost connection after AUTH from unknown[189.91.7.87]
Sep  9 04:43:54 mail.srvfarm.net postfix/smtps/smtpd[2231581]: warning: unknown[189.91.7.87]: SASL PLAIN authentication failed: 
Sep  9 04:43:55 mail.srvfarm.net postfix/smtps/smtpd[2231581]: lost connection after AUTH from unknown[189.91.7.87]
Sep  9 04:45:53 mail.srvfarm.net postfix/smtpd[2230717]: warning: unknown[189.91.7.87]: SASL PLAIN authentication failed:

Sep  9 04:39:37 mail.srvfarm.net postfix/smtpd[2229826]: warning: unknown[189.91.7.87]: SASL PLAIN authentication failed: 
Sep  9 04:39:38 mail.srvfarm.net postfix/smtpd[2229826]: lost connection after AUTH from unknown[189.91.7.87]
Sep  9 04:43:54 mail.srvfarm.net postfix/smtps/smtpd[2231581]: warning: unknown[189.91.7.87]: SASL PLAIN authentication failed: 
Sep  9 04:43:55 mail.srvfarm.net postfix/smtps/smtpd[2231581]: lost connection after AUTH from unknown[189.91.7.87]
Sep  9 04:45:53 mail.srvfarm.net postfix/smtpd[2230717]: warning: unknown[189.91.7.87]: SASL PLAIN authentication failed:

Aug 11 05:11:04 mail.srvfarm.net postfix/smtps/smtpd[2146931]: warning: unknown[189.91.7.87]: SASL PLAIN authentication failed: 
Aug 11 05:11:05 mail.srvfarm.net postfix/smtps/smtpd[2146931]: lost connection after AUTH from unknown[189.91.7.87]
Aug 11 05:12:53 mail.srvfarm.net postfix/smtps/smtpd[2148611]: warning: unknown[189.91.7.87]: SASL PLAIN authentication failed: 
Aug 11 05:12:53 mail.srvfarm.net postfix/smtps/smtpd[2148611]: lost connection after AUTH from unknown[189.91.7.87]
Aug 11 05:20:24 mail.srvfarm.net postfix/smtpd[2161876]: warning: unknown[189.91.7.87]: SASL PLAIN authentication failed:

Brute-Force

Brute-Force

smtp probe/invalid login attempt

(smtpauth) Failed SMTP AUTH login from 189.91.7.203 (BR/Brazil/189-91-7-203.dvl-wr.mastercabo.com.br): 1 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_TRIGGER; Logs: 2020-07-26 08:23:58 plain authenticator failed for ([189.91.7.203]) [189.91.7.203]: 535 Incorrect authentication data (set_id=info)

Jun 18 10:07:55 mail.srvfarm.net postfix/smtps/smtpd[1383000]: warning: unknown[189.91.7.131]: SASL PLAIN authentication failed: 
Jun 18 10:07:55 mail.srvfarm.net postfix/smtps/smtpd[1383000]: lost connection after AUTH from unknown[189.91.7.131]
Jun 18 10:16:07 mail.srvfarm.net postfix/smtps/smtpd[1383077]: warning: unknown[189.91.7.131]: SASL PLAIN authentication failed: 
Jun 18 10:16:07 mail.srvfarm.net postfix/smtps/smtpd[1383077]: lost connection after AUTH from unknown[189.91.7.131]
Jun 18 10:16:21 mail.srvfarm.net postfix/smtpd[1383718]: warning: unknown[189.91.7.131]: SASL PLAIN authentication failed:

Jun 16 05:35:03 mail.srvfarm.net postfix/smtps/smtpd[937455]: warning: unknown[189.91.7.131]: SASL PLAIN authentication failed: 
Jun 16 05:35:03 mail.srvfarm.net postfix/smtps/smtpd[937455]: lost connection after AUTH from unknown[189.91.7.131]
Jun 16 05:40:09 mail.srvfarm.net postfix/smtpd[959422]: lost connection after CONNECT from unknown[189.91.7.131]
Jun 16 05:42:43 mail.srvfarm.net postfix/smtps/smtpd[959464]: warning: unknown[189.91.7.131]: SASL PLAIN authentication failed: 
Jun 16 05:42:44 mail.srvfarm.net postfix/smtps/smtpd[959464]: lost connection after AUTH from unknown[189.91.7.131]

Aug 22 21:29:09 xeon postfix/smtpd[58871]: warning: unknown[189.91.7.186]: SASL PLAIN authentication failed: authentication failure

$f2bV_matches

Aug 21 13:41:20 xeon postfix/smtpd[6396]: warning: unknown[189.91.7.46]: SASL PLAIN authentication failed: authentication failure

Unauthorized SMTP/IMAP/POP3 connection attempt

SASL PLAIN auth failed: ruser=...

Aug  6 17:37:55 web1 postfix/smtpd[4731]: warning: unknown[189.91.7.157]: SASL PLAIN authentication failed: authentication failure
...

failed_logins

failed_logins

failed_logins

sshd

Jun 11 16:24:13 uapps sshd[3184]: User r.r from 183.66.65.247 not allowed because not listed in AllowUsers
Jun 11 16:24:13 uapps sshd[3184]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=183.66.65.247  user=r.r
Jun 11 16:24:16 uapps sshd[3184]: Failed password for invalid user r.r from 183.66.65.247 port 52101 ssh2
Jun 11 16:24:16 uapps sshd[3184]: Received disconnect from 183.66.65.247: 11: Bye Bye [preauth]
Jun 11 16:39:08 uapps sshd[3913]: Failed password for invalid user satkamp from 183.66.65.247 port 54491 ssh2
Jun 11 16:39:08 uapps sshd[3913]: Received disconnect from 183.66.65.247: 11: Bye Bye [preauth]
Jun 11 16:41:54 uapps sshd[3920]: User r.r from 183.66.65.247 not allowed because not listed in AllowUsers
Jun 11 16:41:54 uapps sshd[3920]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=183.66.65.247  user=r.r


........
-----------------------------------------------
https://www.blocklist.de/en/view.html?ip=183.66.65.

Jun 13 16:02:56 legacy sshd[20649]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=203.99.62.158
Jun 13 16:02:59 legacy sshd[20649]: Failed password for invalid user medieval from 203.99.62.158 port 24651 ssh2
Jun 13 16:06:57 legacy sshd[20799]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=203.99.62.158
...

PHISHING SPAM!

2020-06-13T12:22:54.010886abusebot-4.cloudsearch.cf sshd[6548]: Invalid user test from 220.248.95.178 port 38986
2020-06-13T12:22:54.022216abusebot-4.cloudsearch.cf sshd[6548]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=220.248.95.178
2020-06-13T12:22:54.010886abusebot-4.cloudsearch.cf sshd[6548]: Invalid user test from 220.248.95.178 port 38986
2020-06-13T12:22:56.190417abusebot-4.cloudsearch.cf sshd[6548]: Failed password for invalid user test from 220.248.95.178 port 38986 ssh2
2020-06-13T12:24:56.165278abusebot-4.cloudsearch.cf sshd[6663]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=220.248.95.178  user=root
2020-06-13T12:24:58.418335abusebot-4.cloudsearch.cf sshd[6663]: Failed password for root from 220.248.95.178 port 33826 ssh2
2020-06-13T12:26:31.759002abusebot-4.cloudsearch.cf sshd[6741]: Invalid user tmp from 220.248.95.178 port 56900
...

Jun 13 15:12:00 internal-server-tf sshd\[953\]: Invalid user administrator from 37.49.226.62Jun 13 15:12:38 internal-server-tf sshd\[981\]: Invalid user admin from 37.49.226.62
...

Jun 13 14:17:13 srv-ubuntu-dev3 sshd[120990]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=210.125.115.152  user=root
Jun 13 14:17:16 srv-ubuntu-dev3 sshd[120990]: Failed password for root from 210.125.115.152 port 5175 ssh2
Jun 13 14:21:35 srv-ubuntu-dev3 sshd[121658]: Invalid user admin from 210.125.115.152
Jun 13 14:21:35 srv-ubuntu-dev3 sshd[121658]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=210.125.115.152
Jun 13 14:21:35 srv-ubuntu-dev3 sshd[121658]: Invalid user admin from 210.125.115.152
Jun 13 14:21:37 srv-ubuntu-dev3 sshd[121658]: Failed password for invalid user admin from 210.125.115.152 port 10877 ssh2
Jun 13 14:26:04 srv-ubuntu-dev3 sshd[122337]: Invalid user abc from 210.125.115.152
Jun 13 14:26:04 srv-ubuntu-dev3 sshd[122337]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=210.125.115.152
Jun 13 14:26:04 srv-ubuntu-dev3 sshd[122337]: Invalid 
...

(sshd) Failed SSH login from 157.245.91.72 (US/United States/-): 2 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_SSHD; Logs: Jun 13 14:25:50 ubnt-55d23 sshd[5077]: Invalid user monitor from 157.245.91.72 port 52706
Jun 13 14:25:52 ubnt-55d23 sshd[5077]: Failed password for invalid user monitor from 157.245.91.72 port 52706 ssh2

Jun 13 13:54:46 ip-172-31-61-156 sshd[18400]: Invalid user luiz from 37.187.5.137
Jun 13 13:54:46 ip-172-31-61-156 sshd[18400]: Invalid user luiz from 37.187.5.137
Jun 13 13:54:46 ip-172-31-61-156 sshd[18400]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=37.187.5.137
Jun 13 13:54:46 ip-172-31-61-156 sshd[18400]: Invalid user luiz from 37.187.5.137
Jun 13 13:54:48 ip-172-31-61-156 sshd[18400]: Failed password for invalid user luiz from 37.187.5.137 port 59338 ssh2
...

Jun 13 15:28:11 jane sshd[13671]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=68.183.48.172 
Jun 13 15:28:14 jane sshd[13671]: Failed password for invalid user tinasong from 68.183.48.172 port 50380 ssh2
...

Jun 13 14:26:19 debian-2gb-nbg1-2 kernel: \[14309896.081672\] \[UFW BLOCK\] IN=eth0 OUT= MAC=96:00:00:0e:18:f4:d2:74:7f:6e:37:e3:08:00 SRC=74.84.150.75 DST=195.201.40.59 LEN=52 TOS=0x02 PREC=0x00 TTL=114 ID=9036 DF PROTO=TCP SPT=57300 DPT=52 WINDOW=8192 RES=0x00 CWR ECE SYN URGP=0

[2020-06-13 10:53:19] NOTICE[1273] chan_sip.c: Registration from '' failed for '147.135.253.94:59811' - Wrong password
[2020-06-13 10:53:19] SECURITY[1288] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-06-13T10:53:19.543-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="360",SessionID="0x7f31c02f7128",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/147.135.253.94/59811",Challenge="29c538fa",ReceivedChallenge="29c538fa",ReceivedHash="9f43a9cded0d38ede595a501646fe539"
[2020-06-13 10:54:40] NOTICE[1273] chan_sip.c: Registration from '' failed for '147.135.253.94:55293' - Wrong password
[2020-06-13 10:54:40] SECURITY[1288] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-06-13T10:54:40.036-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="1",SessionID="0x7f31c030c488",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/147.135.253.94/552
...

2020-06-13 18:09:01 auth_plain authenticator failed for (User) [212.70.149.18]: 535 Incorrect authentication data (set_id=poznan@lavrinenko.info)
2020-06-13 18:09:48 auth_plain authenticator failed for (User) [212.70.149.18]: 535 Incorrect authentication data (set_id=post2@lavrinenko.info)
...

2020-06-13T15:27:43.405170amanda2.illicoweb.com sshd\[17668\]: Invalid user git from 145.255.31.188 port 37366
2020-06-13T15:27:43.407411amanda2.illicoweb.com sshd\[17668\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=145.255.31.188
2020-06-13T15:27:45.133493amanda2.illicoweb.com sshd\[17668\]: Failed password for invalid user git from 145.255.31.188 port 37366 ssh2
2020-06-13T15:31:07.044744amanda2.illicoweb.com sshd\[18087\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=145.255.31.188  user=root
2020-06-13T15:31:08.780331amanda2.illicoweb.com sshd\[18087\]: Failed password for root from 145.255.31.188 port 36854 ssh2
...

Jun 13 11:11:57 firewall sshd[8615]: Failed password for root from 112.85.42.173 port 32999 ssh2
Jun 13 11:12:01 firewall sshd[8615]: Failed password for root from 112.85.42.173 port 32999 ssh2
Jun 13 11:12:04 firewall sshd[8615]: Failed password for root from 112.85.42.173 port 32999 ssh2
...