Summary
On October 7, 2025, the ransomware group Qilin publicly claimed responsibility for an attack targeting California Golf Club of San Francisco. According to the threat actor’s post, they intend to release sensitive data unless negotiations are initiated.
Incident Report
| Field | Details |
|---|---|
| Target | California Golf Club of San Francisco |
| Domain | |
| Country | USA |
| Attacking Group | Qilin |
| Date Reported | October 7, 2025 |
| Threat Actor Statement | “The full leak will be published soon, unless a company representative contacts us via the channels provided.” |
About the Company
California Golf Club of San Francisco, commonly known as Cal Club, is a private golf club established in 1918, originally located in Ingleside before moving to its current 425-acre site in 1924. The club features a world-class golf course.
About Qilin Group
Qilin is a notorious ransomware group known for targeting high-profile organizations across various sectors, demanding ransom payments in exchange for not releasing sensitive data.
Proactive Response to Threats
Organizations can proactively respond to such ransomware threats through regular darkweb monitoring. Keeping an eye on potential data breaches and ransomware chatter on the darkweb is crucial. We recommend using the email breach checker at MSP DarkIntel Domain Breach Scan to monitor your company’s exposure and take necessary actions promptly.
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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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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