Used stolen mailbox credentials to send spam through our mail server via authenticated SMTP (submiss ...
show moreUsed stolen mailbox credentials to send spam through our mail server via authenticated SMTP (submission). 2026-09-24 23:08 - 2026-09-25 00:59 UTC: 5,000 SMTP AUTH sessions with zero failures (password known in advance), one message per session, ~5,000 unique corporate recipients in ~4,250 domains. Scripted sender (Python, Message-ID @smtp-workbench.local). Password reset, IP blocked.
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SMTP AUTH brute-force (Postfix SASL password guessing) against 3 of our mail servers, every day sinc ...
show moreSMTP AUTH brute-force (Postfix SASL password guessing) against 3 of our mail servers, every day since 2026-09-14; 256 failed attempts on one server on 2026-09-27 alone. No successful login on any server. IP now blocked on our mail servers.
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SMTP AUTH brute-force on submission port 587 (Postfix SASL LOGIN): password guessing against a singl ...
show moreSMTP AUTH brute-force on submission port 587 (Postfix SASL LOGIN): password guessing against a single valid mailbox at a steady ~100 attempts/hour. 791 failed attempts on 2026-09-22 and 1,190+ on 2026-09-27 (07:04-18:30 UTC+3). No successful login. IP now blocked on our mail servers.
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Successful RDP intrusion. This address logged in to a Windows workstation over RDP as the built-in l ...
show moreSuccessful RDP intrusion. This address logged in to a Windows workstation over RDP as the built-in local Administrator account on 2026-09-02 at 23:02:39 (UTC+3). Within nine minutes the session ran network discovery (Advanced IP Scanner, port scanner) and credential-theft tooling (Mimikatz, BulletsPassView, WirelessKeyView), then authenticated onward to a second host over SMB and deployed ransomware on both. Evidence: TerminalServices-LocalSessionManager EventID 21/22 with source address, Prefetch execution records, Security EventID 4624 LogonType 3.
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Phishing email submission. This address authenticated via ESMTPSA to a third-party mail server using ...
show morePhishing email submission. This address authenticated via ESMTPSA to a third-party mail server using forged HELO 8ce5.net and sent a credential-phishing message received by us on 2026-08-26T14:34:35 (UTC+3). Display name spoofed the recipient organisation's IT administrator; subject themed as a final warning about account deactivation; no SPF/DKIM/DMARC pass. Attached HTML file (SHA256 35c7c096ec8913bf44776fef2207c7af8a0fef126f99cfe6c39ed2b18245475f, MD5 f29a0d94e82f747055d6b1b0251166a1) is a multi-layer obfuscated fake Roundcube webmail login page that prefills the victim address and exfiltrates submitted credentials to the Telegram Bot API (bot id 8110994190), then redirects to not-on-the-list.lovable.app.
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Windows SMB/NTLM brute-force. 111 failed authentications (EventID 4625, LogonType 3, NTLM) in a sing ...
show moreWindows SMB/NTLM brute-force. 111 failed authentications (EventID 4625, LogonType 3, NTLM) in a single burst between 2026-08-19T00:38 and 2026-08-19T01:12 (UTC+3). Source workstation name WIN-BMK739Q7BDC. No successful authentication from this address.
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Zimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status chan ...
show moreZimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status change" line into the mail log, where the swatchdog monitor would interpolate it into a shell. Envelope sender [email protected], HELO mx-test.invalid. 2 attempts against 2 of our mail servers between 2026-08-29T22:10 and 2026-08-29T22:10 (UTC+3). All rejected 554 5.7.1.
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Zimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status chan ...
show moreZimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status change" line into the mail log, where the swatchdog monitor would interpolate it into a shell. Envelope sender [email protected], HELO mx-test.invalid. 1 attempts against 1 of our mail servers between 2026-08-27T09:51 and 2026-08-27T09:51 (UTC+3). All rejected 554 5.7.1.
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Zimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status chan ...
show moreZimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status change" line into the mail log, where the swatchdog monitor would interpolate it into a shell. Envelope sender [email protected], HELO mx-test.invalid. 1 attempts against 1 of our mail servers between 2026-08-29T21:47 and 2026-08-29T21:47 (UTC+3). All rejected 554 5.7.1.
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Zimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status chan ...
show moreZimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status change" line into the mail log, where the swatchdog monitor would interpolate it into a shell. Envelope sender [email protected], HELO mx-test.invalid. 1 attempts against 1 of our mail servers between 2026-08-27T19:53 and 2026-08-27T19:53 (UTC+3). All rejected 554 5.7.1. Reverse DNS: mail.simplyitcloud.com. Category 20 added because this looks like a legitimate mail host, likely compromised rather than attacker-owned.
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Zimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status chan ...
show moreZimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status change" line into the mail log, where the swatchdog monitor would interpolate it into a shell. Envelope sender [email protected], HELO mx-test.invalid. 6 attempts against 1 of our mail servers between 2026-08-26T11:57 and 2026-08-27T10:37 (UTC+3). All rejected 554 5.7.1.
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Zimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status chan ...
show moreZimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status change" line into the mail log, where the swatchdog monitor would interpolate it into a shell. Envelope sender [email protected], HELO mx-test.invalid. 3 attempts against 2 of our mail servers between 2026-08-27T19:46 and 2026-08-27T19:46 (UTC+3). All rejected 554 5.7.1.
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Zimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status chan ...
show moreZimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status change" line into the mail log, where the swatchdog monitor would interpolate it into a shell. Envelope sender [email protected], HELO mx-test.invalid. 28 attempts against 8 of our mail servers between 2026-08-29T14:35 and 2026-08-30T08:49 (UTC+3). All rejected 554 5.7.1. Reverse DNS: mail.1840andco.me. Category 20 added because this looks like a legitimate mail host, likely compromised rather than attacker-owned.
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Zimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status chan ...
show moreZimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status change" line into the mail log, where the swatchdog monitor would interpolate it into a shell. Envelope sender [email protected], HELO mx-test.invalid. 1 attempts against 1 of our mail servers between 2026-08-27T11:37 and 2026-08-27T11:37 (UTC+3). All rejected 554 5.7.1. Reverse DNS: static.169.133.109.65.clients.your-server.de.
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Zimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status chan ...
show moreZimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status change" line into the mail log, where the swatchdog monitor would interpolate it into a shell. Envelope sender [email protected], HELO mx-test.invalid. 2 attempts against 1 of our mail servers between 2026-08-27T04:44 and 2026-08-27T05:46 (UTC+3). All rejected 554 5.7.1. Reverse DNS: vps1891.baseservers.com.
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Zimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status chan ...
show moreZimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status change" line into the mail log, where the swatchdog monitor would interpolate it into a shell. Envelope sender [email protected], HELO mx-test.invalid. 40 attempts against 2 of our mail servers between 2026-08-29T00:33 and 2026-08-29T14:16 (UTC+3). All rejected 554 5.7.1. Reverse DNS: vmi2962096.contaboserver.net.
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Zimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status chan ...
show moreZimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status change" line into the mail log, where the swatchdog monitor would interpolate it into a shell. Envelope sender [email protected], HELO mx-test.invalid. 4 attempts against 2 of our mail servers between 2026-08-27T03:11 and 2026-08-28T16:12 (UTC+3). All rejected 554 5.7.1.
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Zimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status chan ...
show moreZimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status change" line into the mail log, where the swatchdog monitor would interpolate it into a shell. Envelope sender [email protected], HELO mx-test.invalid. 2 attempts against 1 of our mail servers between 2026-08-29T13:28 and 2026-08-29T14:02 (UTC+3). All rejected 554 5.7.1. Reverse DNS: mail.mktg.lv. Category 20 added because this looks like a legitimate mail host, likely compromised rather than attacker-owned.
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Zimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status chan ...
show moreZimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status change" line into the mail log, where the swatchdog monitor would interpolate it into a shell. Envelope sender [email protected], HELO mx-test.invalid. 18 attempts against 2 of our mail servers between 2026-08-26T09:08 and 2026-08-26T18:44 (UTC+3). All rejected 554 5.7.1.
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Zimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status chan ...
show moreZimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status change" line into the mail log, where the swatchdog monitor would interpolate it into a shell. Envelope sender [email protected], HELO mx-test.invalid. 4 attempts against 2 of our mail servers between 2026-08-28T21:55 and 2026-08-29T19:17 (UTC+3). All rejected 554 5.7.1. Reverse DNS: z1.mailpark.com.tr. Category 20 added because this looks like a legitimate mail host, likely compromised rather than attacker-owned.
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Zimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status chan ...
show moreZimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status change" line into the mail log, where the swatchdog monitor would interpolate it into a shell. Envelope sender [email protected], HELO mx-test.invalid. 66 attempts against 2 of our mail servers between 2026-08-28T01:10 and 2026-08-29T01:05 (UTC+3). All rejected 554 5.7.1.
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Zimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status chan ...
show moreZimbra SMTP command-injection attempt: RCPT TO address crafted to inject a fake "Service status change" line into the mail log, where the swatchdog monitor would interpolate it into a shell. Envelope sender [email protected], HELO mx-test.invalid. 2 attempts against 2 of our mail servers between 2026-08-28T12:55 and 2026-08-28T12:55 (UTC+3). All rejected 554 5.7.1. Reverse DNS: vps2447004.fastwebserver.de.
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