Summary
On October 8, 2025, the ransomware group Sinobi claimed responsibility for an attack on JB Brown & Sons, an established U.S.-based commercial property management company. The threat actors have threatened to release sensitive data unless the company engages in negotiations.
Incident Report
| Field | Details |
|---|---|
| Target | JB Brown & Sons |
| Domain | Not provided |
| Country | USA |
| Attacking Group | Sinobi |
| Date Reported | October 8, 2025 |
| Threat Actor Statement | “Sensitive data will be exposed unless JB Brown & Sons negotiates with us.” |
About JB Brown & Sons
JB Brown & Sons is a reputable commercial property management and development company located in Portland, Maine. With over 200 years of experience, they specialize in owning, leasing, and managing a wide range of commercial properties, including office, warehouse, manufacturing, retail, and mixed-use buildings. They are committed to providing responsive services to meet tenants’ needs, contributing to their longstanding presence in the Greater Portland area.
About Sinobi
Sinobi is a notorious ransomware group known for targeting organizations across various sectors. They employ sophisticated techniques to infiltrate systems, encrypt data, and demand ransom payments for decryption keys, often threatening to release sensitive information if their demands are not met.
Proactive Measures Against Ransomware Threats
To proactively counter such ransomware threats, organizations are encouraged to implement robust cybersecurity measures and engage in dark web monitoring. This involves regularly scanning for compromised data and potential threats. A valuable tool for monitoring company data breaches is the domain breach scan, which helps organizations stay informed about their cybersecurity posture and protect against potential attacks.
Recommendations
- Monitor your domains and email addresses for exposure using reputable threat intelligence tools.
- Conduct a full compromise assessment and incident response drill internally.
- Verify backups and ensure they are offline and ransomware-resistant.
- Educate staff on phishing, social engineering, and lateral movement techniques used by groups like Qilin.
- Engage with cyber forensics and legal counsel before initiating contact with threat actors.
Check Your Exposure
Wondering if your organization or employees are impacted by recent breach activity?
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Check domain-wide breach exposure:
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Check if an email was breached:
mspdarkintel.com/email-breach-scan
Disclaimer
The MSPDarkIntel team does not engage in the exfiltration, downloading, taking, hosting, viewing, reposting, or disclosure of any stolen information.
All breach data reported here is sourced from publicly available threat intelligence feeds for awareness and early-warning purposes only.
Our goal is to inform organizations of emerging threats so they can take timely defensive action.
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