2019-11-09 14:45:09 server smtpd[44743]: warning: unknown[141.98.80.100]:14070: SASL CRAM-MD5 authentication failed: PDc2MTE4Mzg1MDA5ODIwMTEuMTU3MzMzOTUwN0BzY2FsbG9wLmxvY2FsPg==

Nov 11 09:01:03 server postfix/smtps/smtpd[30289]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:
Nov 11 09:01:11 server postfix/smtps/smtpd[30289]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:
Nov 11 09:24:40 server postfix/smtps/smtpd[31621]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:

2019-11-10T23:27:33.482948mail01 postfix/smtpd[4637]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:
2019-11-10T23:27:40.382656mail01 postfix/smtpd[16734]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:
2019-11-10T23:33:01.086361mail01 postfix/smtpd[22112]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:

Nov 10 06:06:48 andromeda postfix/smtpd\[49685\]: warning: unknown\[141.98.80.100\]: SASL PLAIN authentication failed: authentication failure
Nov 10 06:06:48 andromeda postfix/smtpd\[25284\]: warning: unknown\[141.98.80.100\]: SASL PLAIN authentication failed: authentication failure
Nov 10 06:06:49 andromeda postfix/smtpd\[25286\]: warning: unknown\[141.98.80.100\]: SASL PLAIN authentication failed: authentication failure
Nov 10 06:06:49 andromeda postfix/smtpd\[10700\]: warning: unknown\[141.98.80.100\]: SASL PLAIN authentication failed: authentication failure
Nov 10 06:06:55 andromeda postfix/smtpd\[17058\]: warning: unknown\[141.98.80.100\]: SASL PLAIN authentication failed: authentication failure

2019-11-09T19:37:25.339939mail01 postfix/smtpd[15664]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:
2019-11-09T19:37:32.377653mail01 postfix/smtpd[15219]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:
2019-11-09T19:39:50.062926mail01 postfix/smtpd[15664]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:

2019-11-09T15:06:29.044731mail01 postfix/smtpd[27946]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:
2019-11-09T15:06:36.457479mail01 postfix/smtpd[25834]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:
2019-11-09T15:07:07.472339mail01 postfix/smtpd[19046]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:

Nov  9 07:03:32 andromeda postfix/smtpd\[47403\]: warning: unknown\[141.98.80.100\]: SASL PLAIN authentication failed: authentication failure
Nov  9 07:03:32 andromeda postfix/smtpd\[53314\]: warning: unknown\[141.98.80.100\]: SASL PLAIN authentication failed: authentication failure
Nov  9 07:03:33 andromeda postfix/smtpd\[553\]: warning: unknown\[141.98.80.100\]: SASL PLAIN authentication failed: authentication failure
Nov  9 07:03:33 andromeda postfix/smtpd\[47403\]: warning: unknown\[141.98.80.100\]: SASL PLAIN authentication failed: authentication failure
Nov  9 07:03:45 andromeda postfix/smtpd\[553\]: warning: unknown\[141.98.80.100\]: SASL PLAIN authentication failed: authentication failure

2019-11-09T01:16:45.037935mail01 postfix/smtpd[22665]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:
2019-11-09T01:16:51.498633mail01 postfix/smtpd[10134]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:
2019-11-09T01:17:30.207894mail01 postfix/smtpd[10134]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:

2019-11-08T14:03:47.399482mail01 postfix/smtpd[27648]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:
2019-11-08T14:03:54.018015mail01 postfix/smtpd[15707]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:
2019-11-08T14:03:55.019066mail01 postfix/smtpd[27648]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:

2019-11-08T06:04:17.442801mail01 postfix/smtpd[29666]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:
2019-11-08T06:04:24.427630mail01 postfix/smtpd[21776]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:
2019-11-08T06:05:44.403484mail01 postfix/smtpd[23975]: warning: unknown[141.98.80.100]: SASL PLAIN authentication failed:

Brute force password guessing

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

2019-10-08T06:30:01.359227abusebot-5.cloudsearch.cf sshd\[32148\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=mail.beltrade.pl  user=root

Aug 11 15:41:58 dallas01 sshd[19805]: Failed password for root from 111.6.78.213 port 60842 ssh2
Aug 11 15:42:01 dallas01 sshd[19805]: Failed password for root from 111.6.78.213 port 60842 ssh2
Aug 11 15:42:03 dallas01 sshd[19805]: Failed password for root from 111.6.78.213 port 60842 ssh2

Oct  8 08:03:57 h2177944 sshd\[29536\]: Invalid user Bugatti@123 from 178.128.215.16 port 51320
Oct  8 08:03:57 h2177944 sshd\[29536\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=178.128.215.16
Oct  8 08:03:58 h2177944 sshd\[29536\]: Failed password for invalid user Bugatti@123 from 178.128.215.16 port 51320 ssh2
Oct  8 08:07:55 h2177944 sshd\[29650\]: Invalid user School@2017 from 178.128.215.16 port 35414
...

\[2019-10-08 02:50:27\] NOTICE\[1887\] chan_sip.c: Registration from '\' failed for '77.247.110.202:64410' - Wrong password
\[2019-10-08 02:50:27\] SECURITY\[1898\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-10-08T02:50:27.472-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="86666000",SessionID="0x7fc3ac2ed548",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/77.247.110.202/64410",Challenge="3a3d4764",ReceivedChallenge="3a3d4764",ReceivedHash="c83a966499e352702d0cdecb5ed80add"
\[2019-10-08 02:50:27\] NOTICE\[1887\] chan_sip.c: Registration from '\' failed for '77.247.110.202:64411' - Wrong password
\[2019-10-08 02:50:27\] SECURITY\[1898\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-10-08T02:50:27.620-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="86666000",SessionID="0x7fc3ac00c388",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/77

Oct  8 06:55:56 sauna sshd[8084]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=165.228.152.222
Oct  8 06:55:58 sauna sshd[8084]: Failed password for invalid user 1qw23er45t from 165.228.152.222 port 40932 ssh2
...

2019-10-08T01:15:52.7982291495-001 sshd\[41825\]: Failed password for invalid user P4ssword2016 from 173.241.21.82 port 44234 ssh2
2019-10-08T01:34:30.5489651495-001 sshd\[43390\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=173.241.21.82  user=root
2019-10-08T01:34:32.1606731495-001 sshd\[43390\]: Failed password for root from 173.241.21.82 port 47190 ssh2
2019-10-08T01:38:18.0874571495-001 sshd\[43620\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=173.241.21.82  user=root
2019-10-08T01:38:20.0000211495-001 sshd\[43620\]: Failed password for root from 173.241.21.82 port 59046 ssh2
2019-10-08T01:42:02.9605061495-001 sshd\[43923\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=173.241.21.82  user=root
...

May 17 19:29:54 ubuntu sshd[25489]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=111.93.228.190
May 17 19:29:56 ubuntu sshd[25489]: Failed password for invalid user lie from 111.93.228.190 port 38732 ssh2
May 17 19:33:29 ubuntu sshd[25565]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=111.93.228.190

rain

Oct  8 06:51:48 www5 sshd\[58410\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=207.154.206.212  user=root
Oct  8 06:51:50 www5 sshd\[58410\]: Failed password for root from 207.154.206.212 port 39010 ssh2
Oct  8 06:55:33 www5 sshd\[59014\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=207.154.206.212  user=root
...

Telnet Server BruteForce Attack

Oct  8 11:40:08 gw1 sshd[15584]: Failed password for root from 223.220.159.78 port 31419 ssh2
...

2019-10-08T06:49:11.950030abusebot-3.cloudsearch.cf sshd\[11742\]: Invalid user qwe\#@! from 5.196.75.178 port 49252

Oct  8 08:07:05 * sshd[4375]: Failed password for root from 129.28.180.174 port 51212 ssh2

2019-10-08T06:44:40.972564abusebot-5.cloudsearch.cf sshd\[32298\]: Invalid user robert from 2.136.131.36 port 48206

Oct  8 08:41:23 bouncer sshd\[28847\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=207.154.193.178  user=root
Oct  8 08:41:25 bouncer sshd\[28847\]: Failed password for root from 207.154.193.178 port 40706 ssh2
Oct  8 08:45:25 bouncer sshd\[28894\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=207.154.193.178  user=root
...