Apr 19 06:38:50 web01.agentur-b-2.de postfix/smtpd[82653]: warning: unknown[141.98.80.30]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr 19 06:38:50 web01.agentur-b-2.de postfix/smtpd[81971]: warning: unknown[141.98.80.30]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr 19 06:38:50 web01.agentur-b-2.de postfix/smtpd[82653]: lost connection after AUTH from unknown[141.98.80.30]
Apr 19 06:38:50 web01.agentur-b-2.de postfix/smtpd[81971]: lost connection after AUTH from unknown[141.98.80.30]
Apr 19 06:38:54 web01.agentur-b-2.de postfix/smtpd[82653]: warning: unknown[141.98.80.30]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr 19 06:38:54 web01.agentur-b-2.de postfix/smtpd[81971]: warning: unknown[141.98.80.30]: SASL LOGIN authentication failed: UGFzc3dvcmQ6

Apr 18 10:41:02 mail.srvfarm.net postfix/smtpd[3972655]: warning: unknown[141.98.80.30]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr 18 10:41:02 mail.srvfarm.net postfix/smtpd[3972655]: lost connection after AUTH from unknown[141.98.80.30]
Apr 18 10:41:07 mail.srvfarm.net postfix/smtpd[3967890]: lost connection after CONNECT from unknown[141.98.80.30]
Apr 18 10:41:11 mail.srvfarm.net postfix/smtpd[3972655]: lost connection after CONNECT from unknown[141.98.80.30]
Apr 18 10:41:15 mail.srvfarm.net postfix/smtpd[3974489]: lost connection after AUTH from unknown[141.98.80.30]

Apr 17 13:51:25 mail postfix/smtpd\[29099\]: warning: unknown\[141.98.80.30\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Apr 17 13:51:25 mail postfix/smtpd\[29711\]: warning: unknown\[141.98.80.30\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Apr 17 13:51:43 mail postfix/smtpd\[29715\]: warning: unknown\[141.98.80.30\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Apr 17 13:51:43 mail postfix/smtpd\[29714\]: warning: unknown\[141.98.80.30\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\

Apr 17 09:32:46 mail postfix/smtpd\[23504\]: warning: unknown\[141.98.80.30\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Apr 17 09:32:46 mail postfix/smtpd\[23503\]: warning: unknown\[141.98.80.30\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Apr 17 09:33:03 mail postfix/smtpd\[23505\]: warning: unknown\[141.98.80.30\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Apr 17 09:33:03 mail postfix/smtpd\[23502\]: warning: unknown\[141.98.80.30\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\

Apr 16 21:43:38 mail postfix/smtpd\[8398\]: warning: unknown\[141.98.80.30\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Apr 16 21:43:38 mail postfix/smtpd\[8508\]: warning: unknown\[141.98.80.30\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Apr 16 21:43:56 mail postfix/smtpd\[8508\]: warning: unknown\[141.98.80.30\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Apr 16 21:43:56 mail postfix/smtpd\[8398\]: warning: unknown\[141.98.80.30\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\

2020-04-15T23:07:03.352250l03.customhost.org.uk postfix/smtps/smtpd[1000]: warning: unknown[141.98.80.30]: SASL LOGIN authentication failed: authentication failure
2020-04-15T23:07:07.002893l03.customhost.org.uk postfix/smtps/smtpd[1000]: warning: unknown[141.98.80.30]: SASL LOGIN authentication failed: authentication failure
2020-04-15T23:08:37.877017l03.customhost.org.uk postfix/smtps/smtpd[1000]: warning: unknown[141.98.80.30]: SASL LOGIN authentication failed: authentication failure
2020-04-15T23:08:42.874667l03.customhost.org.uk postfix/smtps/smtpd[1000]: warning: unknown[141.98.80.30]: SASL LOGIN authentication failed: authentication failure
...

Apr 15 09:12:29 mail.srvfarm.net postfix/smtpd[2077768]: warning: unknown[141.98.80.30]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr 15 09:12:29 mail.srvfarm.net postfix/smtpd[2077768]: lost connection after AUTH from unknown[141.98.80.30]
Apr 15 09:12:34 mail.srvfarm.net postfix/smtpd[2065982]: lost connection after CONNECT from unknown[141.98.80.30]
Apr 15 09:12:38 mail.srvfarm.net postfix/smtpd[2064212]: lost connection after AUTH from unknown[141.98.80.30]
Apr 15 09:12:43 mail.srvfarm.net postfix/smtpd[2079033]: lost connection after CONNECT from unknown[141.98.80.30]

2020-04-14 08:25:10 dovecot_login authenticator failed for \(\[141.98.80.30\]\) \[141.98.80.30\]: 535 Incorrect authentication data \(set_id=inarcassaonline@opso.it\)
2020-04-14 08:25:17 dovecot_login authenticator failed for \(\[141.98.80.30\]\) \[141.98.80.30\]: 535 Incorrect authentication data
2020-04-14 08:25:26 dovecot_login authenticator failed for \(\[141.98.80.30\]\) \[141.98.80.30\]: 535 Incorrect authentication data
2020-04-14 08:25:31 dovecot_login authenticator failed for \(\[141.98.80.30\]\) \[141.98.80.30\]: 535 Incorrect authentication data
2020-04-14 08:25:42 dovecot_login authenticator failed for \(\[141.98.80.30\]\) \[141.98.80.30\]: 535 Incorrect authentication data

Apr 13 20:14:21 web01.agentur-b-2.de postfix/smtpd[607378]: warning: unknown[141.98.80.30]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr 13 20:14:21 web01.agentur-b-2.de postfix/smtpd[607378]: lost connection after AUTH from unknown[141.98.80.30]
Apr 13 20:14:26 web01.agentur-b-2.de postfix/smtpd[606157]: lost connection after AUTH from unknown[141.98.80.30]
Apr 13 20:14:31 web01.agentur-b-2.de postfix/smtpd[607378]: lost connection after AUTH from unknown[141.98.80.30]
Apr 13 20:14:36 web01.agentur-b-2.de postfix/smtpd[606406]: lost connection after AUTH from unknown[141.98.80.30]

Apr 13 00:57:49 srv01 postfix/smtpd\[16753\]: warning: unknown\[141.98.80.30\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr 13 00:58:07 srv01 postfix/smtpd\[16753\]: warning: unknown\[141.98.80.30\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr 13 00:58:33 srv01 postfix/smtpd\[16753\]: warning: unknown\[141.98.80.30\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr 13 00:58:33 srv01 postfix/smtpd\[17823\]: warning: unknown\[141.98.80.30\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr 13 00:58:37 srv01 postfix/smtpd\[17823\]: warning: unknown\[141.98.80.30\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr 13 00:58:37 srv01 postfix/smtpd\[16753\]: warning: unknown\[141.98.80.30\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

Unauthorized connection attempt
IP: 141.98.80.30
Ports affected
    Simple Mail Transfer (25) 
    Message Submission (587) 
Abuse Confidence rating 100%
Found in DNSBL('s)
ASN Details
   AS43350 NForce Entertainment B.V.
   Panama (PA)
   CIDR 141.98.80.0/24
Log Date: 11/04/2020 11:27:44 PM UTC

smtp auth brute force

Scan ports and try log to VPN by default device admin account/password

Oct 13 20:36:42 mail postfix/smtpd\[2755\]: warning: unknown\[141.98.80.73\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Oct 13 21:07:45 mail postfix/smtpd\[3739\]: warning: unknown\[141.98.80.73\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Oct 13 21:08:05 mail postfix/smtpd\[3743\]: warning: unknown\[141.98.80.73\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Oct 13 21:08:21 mail postfix/smtpd\[3743\]: warning: unknown\[141.98.80.73\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\

Oct 13 12:10:32 mail postfix/smtpd\[17486\]: warning: unknown\[141.98.80.73\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Oct 13 12:10:52 mail postfix/smtpd\[17603\]: warning: unknown\[141.98.80.73\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Oct 13 12:11:11 mail postfix/smtpd\[17486\]: warning: unknown\[141.98.80.73\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Oct 13 12:42:04 mail postfix/smtpd\[18268\]: warning: unknown\[141.98.80.73\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\

2020-10-11 20:00:28 dovecot_login authenticator failed for \(\[141.98.80.72\]\) \[141.98.80.72\]: 535 Incorrect authentication data \(set_id=ben@benjaminhauck.com\)
2020-10-11 20:00:36 dovecot_login authenticator failed for \(\[141.98.80.72\]\) \[141.98.80.72\]: 535 Incorrect authentication data
2020-10-11 20:00:45 dovecot_login authenticator failed for \(\[141.98.80.72\]\) \[141.98.80.72\]: 535 Incorrect authentication data
2020-10-11 20:00:51 dovecot_login authenticator failed for \(\[141.98.80.72\]\) \[141.98.80.72\]: 535 Incorrect authentication data
2020-10-11 20:01:03 dovecot_login authenticator failed for \(\[141.98.80.72\]\) \[141.98.80.72\]: 535 Incorrect authentication data
...

Fail2Ban Ban Triggered

Brute Force attack - banned by Fail2Ban

[H1.VM1] Blocked by UFW

port scan hacking

Tried to scan TCP Port but the Antivirus refused. More than 20 times within a few months.

\x03 400 0 "-" "-"

Found on   Binary Defense     / proto=6  .  srcport=65528  .  dstport=53 DNS  .     (757)

Exim brute force attack (multiple auth failures).

UTC 10/08/2020 18:12:24 - 83 - Security Services - Alert - 141.98.80.22, 65534, X1 - xxx.xxx.xxx.xxx, 8651, X1 - tcp - TCP scanned port list, 8691, 8611, 8671, 8601, 8661, 8641, 8681, 8631, 8621, 8651 - Probable port scan detected

Oct  8 17:35:05 relay postfix/smtpd\[8860\]: warning: unknown\[141.98.80.190\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Oct  8 17:35:26 relay postfix/smtpd\[4144\]: warning: unknown\[141.98.80.190\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Oct  8 17:40:26 relay postfix/smtpd\[5072\]: warning: unknown\[141.98.80.190\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Oct  8 17:40:45 relay postfix/smtpd\[4145\]: warning: unknown\[141.98.80.190\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Oct  8 17:46:12 relay postfix/smtpd\[8861\]: warning: unknown\[141.98.80.190\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

scans 10 times in preceeding hours on the ports (in chronological order) 8601 8611 8621 8631 8641 8651 8661 8671 8681 8691

tcp port scan

May 22 08:02:31 pkdns2 sshd\[36513\]: Invalid user msa from 103.89.85.41May 22 08:02:33 pkdns2 sshd\[36513\]: Failed password for invalid user msa from 103.89.85.41 port 41808 ssh2May 22 08:06:31 pkdns2 sshd\[36676\]: Invalid user qkj from 103.89.85.41May 22 08:06:33 pkdns2 sshd\[36676\]: Failed password for invalid user qkj from 103.89.85.41 port 37388 ssh2May 22 08:10:34 pkdns2 sshd\[36843\]: Invalid user pob from 103.89.85.41May 22 08:10:35 pkdns2 sshd\[36843\]: Failed password for invalid user pob from 103.89.85.41 port 32978 ssh2
...

May 22 05:57:12 odroid64 sshd\[11951\]: Invalid user vue from 80.211.249.187
May 22 05:57:12 odroid64 sshd\[11951\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=80.211.249.187
...

Blog Spam

[2020-05-22 01:16:11] NOTICE[1157] chan_sip.c: Registration from '"203" ' failed for '45.143.220.18:5369' - Wrong password
[2020-05-22 01:16:11] SECURITY[1173] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-05-22T01:16:11.527-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="203",SessionID="0x7f5f103a3228",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/45.143.220.18/5369",Challenge="01fccdc7",ReceivedChallenge="01fccdc7",ReceivedHash="cc45f32181854445e73570a75471c10a"
[2020-05-22 01:16:11] NOTICE[1157] chan_sip.c: Registration from '"203" ' failed for '45.143.220.18:5369' - Wrong password
[2020-05-22 01:16:11] SECURITY[1173] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-05-22T01:16:11.656-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="203",SessionID="0x7f5f10348b88",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/45.143.2
...

May 22 03:30:59 XXX sshd[26074]: Invalid user gar from 93.115.1.195 port 42272

Failed password for invalid user from 85.209.0.100 port 16992 ssh2

$f2bV_matches

May 22 01:45:50 NPSTNNYC01T sshd[551]: Failed password for root from 222.186.42.137 port 18098 ssh2
May 22 01:45:59 NPSTNNYC01T sshd[557]: Failed password for root from 222.186.42.137 port 58911 ssh2
May 22 01:46:01 NPSTNNYC01T sshd[557]: Failed password for root from 222.186.42.137 port 58911 ssh2
...

2020-05-22T05:11:30.931189dmca.cloudsearch.cf sshd[16753]: Invalid user pzo from 120.88.46.226 port 58216
2020-05-22T05:11:30.936533dmca.cloudsearch.cf sshd[16753]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=120-88-46-226.snat21.hns.net.in
2020-05-22T05:11:30.931189dmca.cloudsearch.cf sshd[16753]: Invalid user pzo from 120.88.46.226 port 58216
2020-05-22T05:11:32.284106dmca.cloudsearch.cf sshd[16753]: Failed password for invalid user pzo from 120.88.46.226 port 58216 ssh2
2020-05-22T05:14:11.132044dmca.cloudsearch.cf sshd[16947]: Invalid user tnl from 120.88.46.226 port 39580
2020-05-22T05:14:11.137103dmca.cloudsearch.cf sshd[16947]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=120-88-46-226.snat21.hns.net.in
2020-05-22T05:14:11.132044dmca.cloudsearch.cf sshd[16947]: Invalid user tnl from 120.88.46.226 port 39580
2020-05-22T05:14:13.588651dmca.cloudsearch.cf sshd[16947]: Failed password for invalid 
...

Automated report - ssh fail2ban:
May 22 06:13:49 Invalid user pi, port=44905
May 22 06:13:49 Invalid user pi, port=44906
May 22 06:13:49 Invalid user pi, port=44905
May 22 06:13:49 Connection closed by invalid user pi 78.195.178.119 port=44905 [preauth]
May 22 06:13:49 Invalid user pi, port=44906
May 22 06:13:49 Connection closed by invalid user pi 78.195.178.119 port=44906 [preauth]

May 22 11:29:21 webhost01 sshd[20812]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.232.161.243
May 22 11:29:23 webhost01 sshd[20812]: Failed password for invalid user ljh from 49.232.161.243 port 59528 ssh2
...

May 22 05:06:50 cdc sshd[10948]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=123.206.33.56 
May 22 05:06:52 cdc sshd[10948]: Failed password for invalid user uxq from 123.206.33.56 port 41640 ssh2

May 22 07:12:41 meumeu sshd[8023]: Invalid user ell from 49.233.92.50 port 58652
May 22 07:12:41 meumeu sshd[8023]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.233.92.50 
May 22 07:12:41 meumeu sshd[8023]: Invalid user ell from 49.233.92.50 port 58652
May 22 07:12:43 meumeu sshd[8023]: Failed password for invalid user ell from 49.233.92.50 port 58652 ssh2
May 22 07:15:47 meumeu sshd[8414]: Invalid user vsr from 49.233.92.50 port 37024
May 22 07:15:47 meumeu sshd[8414]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.233.92.50 
May 22 07:15:47 meumeu sshd[8414]: Invalid user vsr from 49.233.92.50 port 37024
May 22 07:15:49 meumeu sshd[8414]: Failed password for invalid user vsr from 49.233.92.50 port 37024 ssh2
May 22 07:18:52 meumeu sshd[8827]: Invalid user jyc from 49.233.92.50 port 43626
...

Invalid user zru from 68.183.124.53 port 36732

May 22 05:56:42 server-01 sshd[17884]: Invalid user admin from 45.95.168.175 port 57362
May 22 05:56:43 server-01 sshd[17886]: Invalid user admin from 45.95.168.175 port 57758
May 22 05:56:43 server-01 sshd[17888]: Invalid user ubuntu from 45.95.168.175 port 58152
...