Jun  7 22:58:24 relay postfix/smtpd\[32762\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  7 22:58:42 relay postfix/smtpd\[6701\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  7 23:07:00 relay postfix/smtpd\[3016\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  7 23:07:18 relay postfix/smtpd\[3016\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  7 23:07:39 relay postfix/smtpd\[32762\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

Jun  7 15:04:20 mail postfix/smtpd\[1991\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Jun  7 15:35:18 mail postfix/smtpd\[3078\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Jun  7 15:35:36 mail postfix/smtpd\[3079\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Jun  7 15:35:58 mail postfix/smtpd\[3078\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\

Jun  7 11:46:13 relay postfix/smtpd\[30272\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  7 11:54:14 relay postfix/smtpd\[7360\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  7 11:54:33 relay postfix/smtpd\[7351\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  7 11:57:45 relay postfix/smtpd\[7360\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  7 11:58:04 relay postfix/smtpd\[7360\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

Jun  6 15:17:03 relay postfix/smtpd\[12075\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  6 15:17:21 relay postfix/smtpd\[28252\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  6 15:19:55 relay postfix/smtpd\[21450\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  6 15:20:13 relay postfix/smtpd\[20462\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  6 15:22:08 relay postfix/smtpd\[20439\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

(smtpauth) Failed SMTP AUTH login from 141.98.80.153 (PA/Panama/-): 1 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_TRIGGER; Logs: 2020-06-06 09:20:26 login authenticator failed for ([141.98.80.153]) [141.98.80.153]: 535 Incorrect authentication data (set_id=info@behzisty-esfahan.ir)

Jun  6 03:56:02 relay postfix/smtpd\[14815\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  6 03:56:10 relay postfix/smtpd\[18073\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  6 04:00:33 relay postfix/smtpd\[14841\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  6 04:00:51 relay postfix/smtpd\[14815\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  6 04:05:34 relay postfix/smtpd\[14815\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

Jun  5 15:43:38 mail postfix/smtpd\[7983\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Jun  5 15:43:54 mail postfix/smtpd\[7983\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Jun  5 16:19:54 mail postfix/smtpd\[8893\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\
Jun  5 16:20:12 mail postfix/smtpd\[9187\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6\

Jun  4 20:59:00 mail.srvfarm.net postfix/smtpd[2658921]: warning: unknown[141.98.80.153]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  4 20:59:00 mail.srvfarm.net postfix/smtpd[2658921]: lost connection after AUTH from unknown[141.98.80.153]
Jun  4 20:59:07 mail.srvfarm.net postfix/smtpd[2655118]: warning: unknown[141.98.80.153]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  4 20:59:07 mail.srvfarm.net postfix/smtpd[2655118]: lost connection after AUTH from unknown[141.98.80.153]
Jun  4 20:59:23 mail.srvfarm.net postfix/smtpd[2655118]: warning: unknown[141.98.80.153]: SASL LOGIN authentication failed: UGFzc3dvcmQ6

Jun  3 15:24:46 srv01 postfix/smtpd\[25362\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  3 15:24:59 srv01 postfix/smtpd\[463\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  3 15:25:37 srv01 postfix/smtpd\[20648\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  3 15:25:54 srv01 postfix/smtpd\[463\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  3 15:26:54 srv01 postfix/smtpd\[25362\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...

Jun  2 17:12:13 mail.srvfarm.net postfix/smtpd[1287230]: warning: unknown[141.98.80.153]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun  2 17:12:13 mail.srvfarm.net postfix/smtpd[1287230]: lost connection after AUTH from unknown[141.98.80.153]
Jun  2 17:12:18 mail.srvfarm.net postfix/smtpd[1270863]: lost connection after AUTH from unknown[141.98.80.153]
Jun  2 17:12:23 mail.srvfarm.net postfix/smtpd[1273068]: lost connection after AUTH from unknown[141.98.80.153]
Jun  2 17:12:28 mail.srvfarm.net postfix/smtpd[1272715]: lost connection after AUTH from unknown[141.98.80.153]

May 31 16:08:25 web1 postfix/smtpd\[30367\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
May 31 16:08:44 web1 postfix/smtpd\[30373\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
May 31 16:08:45 web1 postfix/smtpd\[30367\]: warning: unknown\[141.98.80.153\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6

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

Daft bot

MultiHost/MultiPort Probe, Scan, Hack -

Dec 13 23:13:43 nextcloud sshd\[14704\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.169.192  user=root
Dec 13 23:13:45 nextcloud sshd\[14704\]: Failed password for root from 222.186.169.192 port 44566 ssh2
Dec 13 23:13:48 nextcloud sshd\[14704\]: Failed password for root from 222.186.169.192 port 44566 ssh2
...

Dec 13 22:25:08 MK-Soft-VM5 sshd[3286]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=175.143.46.233 
Dec 13 22:25:10 MK-Soft-VM5 sshd[3286]: Failed password for invalid user round from 175.143.46.233 port 37240 ssh2
...

Automatic report - Banned IP Access

Unauthorized IMAP connection attempt

$f2bV_matches

Dec 13 21:24:56 server sshd\[27679\]: Invalid user shiela from 159.203.122.149
Dec 13 21:24:56 server sshd\[27679\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=159.203.122.149 
Dec 13 21:24:58 server sshd\[27679\]: Failed password for invalid user shiela from 159.203.122.149 port 50421 ssh2
Dec 13 21:37:08 server sshd\[30728\]: Invalid user conduit from 159.203.122.149
Dec 13 21:37:08 server sshd\[30728\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=159.203.122.149 
...

Dec  2 03:40:00 vtv3 sshd[26885]: Failed password for invalid user david from 54.39.138.246 port 42036 ssh2
Dec  2 03:45:25 vtv3 sshd[29913]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=54.39.138.246 
Dec  2 03:56:06 vtv3 sshd[2609]: Failed password for root from 54.39.138.246 port 50016 ssh2
Dec  2 04:01:31 vtv3 sshd[5015]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=54.39.138.246 
Dec  2 04:01:33 vtv3 sshd[5015]: Failed password for invalid user testing from 54.39.138.246 port 33846 ssh2
Dec  2 04:12:23 vtv3 sshd[10848]: Failed password for root from 54.39.138.246 port 57990 ssh2
Dec  2 04:17:54 vtv3 sshd[13307]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=54.39.138.246 
Dec  2 04:17:56 vtv3 sshd[13307]: Failed password for invalid user operator from 54.39.138.246 port 41842 ssh2
Dec  2 04:28:53 vtv3 sshd[18270]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=

SSH bruteforce

\[2019-12-13 17:13:49\] NOTICE\[2839\] chan_sip.c: Registration from '\' failed for '81.171.85.147:57793' - Wrong password
\[2019-12-13 17:13:49\] SECURITY\[2857\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-12-13T17:13:49.682-0500",Severity="Error",Service="SIP",EventVersion="2",AccountID="4975",SessionID="0x7f0fb41f2588",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/81.171.85.147/57793",Challenge="4cde0a78",ReceivedChallenge="4cde0a78",ReceivedHash="147535da941dd3ca4b9b5f28f5e3c866"
\[2019-12-13 17:13:59\] NOTICE\[2839\] chan_sip.c: Registration from '\' failed for '81.171.85.147:64572' - Wrong password
\[2019-12-13 17:13:59\] SECURITY\[2857\] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2019-12-13T17:13:59.851-0500",Severity="Error",Service="SIP",EventVersion="2",AccountID="5309",SessionID="0x7f0fb4ca4128",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/81.171.85

Dec 13 22:49:48 OPSO sshd\[3101\]: Invalid user tester from 104.248.159.69 port 53530
Dec 13 22:49:48 OPSO sshd\[3101\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=104.248.159.69
Dec 13 22:49:51 OPSO sshd\[3101\]: Failed password for invalid user tester from 104.248.159.69 port 53530 ssh2
Dec 13 22:55:40 OPSO sshd\[4580\]: Invalid user nfs from 104.248.159.69 port 33728
Dec 13 22:55:40 OPSO sshd\[4580\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=104.248.159.69

Dec 13 18:29:18 firewall sshd[2134]: Failed password for invalid user sampless from 5.135.152.97 port 53138 ssh2
Dec 13 18:35:47 firewall sshd[2199]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=5.135.152.97  user=root
Dec 13 18:35:49 firewall sshd[2199]: Failed password for root from 5.135.152.97 port 59658 ssh2
...

Dec 14 03:29:10 areeb-Workstation sshd[28556]: Failed password for root from 152.32.130.93 port 39384 ssh2
...

51.158.24.203 was recorded 5 times by 5 hosts attempting to connect to the following ports: 5060. Incident counter (4h, 24h, all-time): 5, 36, 360