Summary
On October 8, 2025, the ransomware group Radar publicly claimed responsibility for an attack targeting
Chek Tan and Company, LLP (chektan.com), a U.S.-based company offering accounting and consulting services.
According to the threat actor’s post, they intend to release sensitive data unless negotiations are initiated.
Incident Report
| Field | Details |
|---|---|
| Target | Chek Tan and Company, LLP |
| Domain | chektan.com |
| Country | USA |
| Attacking Group | Radar |
| Date Reported | October 8, 2025 |
| Threat Actor Statement | “The full leak will be published soon, unless a company representative contacts us via the channels provided.” |
About Chek Tan and Company, LLP
Chek Tan and Company, LLP is a respected firm based in San Francisco, California, offering a range of services including accounting, audits, management consulting, IRS representation, and tax management. Their commitment to excellence has made them a trusted partner for businesses across the region.
About the Radar Group
The Radar group has been linked to several high-profile ransomware attacks, leveraging sophisticated techniques to infiltrate and exploit vulnerable systems. Their demands usually involve significant ransom payments, with threats of data leaks to pressure their victims.
Proactive Measures Against Ransomware Threats
Organizations are encouraged to adopt proactive measures to guard against ransomware threats, including regular security audits, staff training, and robust data backup solutions. Darkweb monitoring plays a crucial role in identifying potential breaches early, allowing companies to respond swiftly.
To safeguard your organization, use tools like the email breach checker to keep an eye on potential threats and protect your digital assets.
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?
- Check domain-wide breach exposure:
mspdarkintel.com/domain-breach-scan - 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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