Ransomware Group thegentlemen Hits: Sincere Corporation
Summary
In the latest cybersecurity news, Sincere Corporation — a company operating in the US — has fallen victim to a ransomware attack conducted by the group thegentlemen. This data breach, discovered on 2026-01-21 00:27:51.743441, underscores the increasing need for proactive cybersecurity defenses as we continue through 2026.
Incident Report
| Attribute | Information |
|---|---|
| Target Organization | Sincere Corporation |
| Threat Group | thegentlemen |
| Summary | Sincerehq.com SINCERE Corporation is a Japanese environmental services company operating under the philosophy of “Symbiosis with Nature,” offering “one-stop” solutions in waste management and building maintenance across four main segments: Resource Cycling, Recycling Business, Environmental Improvement and Building Maintenance, and Environmental Consulting. Established in 1969, the company contributes to Japan’s circular economy with nationwide operations, including major facilities in Shinagawa and Yokohama. |
| Date of Breach | 2026-01-20 23:52:47.000000 |
| Discovery Date | 2026-01-21 00:27:51.743441 |
| Target Domain | sincerehq.com |
Recommended Security Actions
In response to increasing cyber threats, it’s critical to protect your organization with proactive security measures. HookPhish provides enterprise-grade solutions designed to reduce your risk of future attacks:
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- Data Breach Monitoring – Get real-time alerts if your organization’s data appears in public or dark web breaches.
- Phishing Detection and Response – Detect, investigate, and neutralize phishing threats before they cause damage.
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How HookPhish Helps You Stay Ahead
Don’t wait for a breach to take action — stay informed and take control of your cybersecurity posture today.
You can also check if your organization’s data has been exposed using our free Data Breach Checker.
Disclaimer
HookPhish 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 purposes only.
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