USAC System: ransomware attack
Ransomware affected some development and support servers on August 6. November's update could not rule out access or theft of 2,553 stored personal records, including 125 employee entries, but found no external leakage or secondary harm. Products and cloud services operated in separate environments and were unaffected.
Disclosed
2025-08-08
Organizations involved
1
Leaked or at risk
2.6K
2,553
Downtime
Unknown
Timeline
- Detected 2025-08-06
- Disclosed 2025-08-08
- 2 days
Attack or cause
- Method
- [Ransomware]
- Impact
- [Service outage][Data leak]
- Entry point
- Unknown
Data exposed or at risk
Organizations involved
[Breached][Major]Osaka, Osaka, ChuoInformation and communications2,553 leaked
USAC System Co., Ltd.
Sources
- [1][Official]弊社にて発生したセキュリティインシデントについて(第一報)USAC System Co., Ltd. · 2025-08-08
- [2][Official]弊社にて発生したセキュリティインシデントについて(第三報)USAC System Co., Ltd. · 2025-11-12