> JapanHacked_
[Contained][Severity: Major][Ransomware]

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

  1. Detected 2025-08-06
  2. Disclosed 2025-08-08
  3. 2 days

Attack or cause

Method
[Ransomware]
Impact
[Service outage][Data leak]
Entry point
Unknown

Data exposed or at risk

[Name][E-mail address][Phone number]

Organizations involved

Open in organization search

Sources

  1. [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. [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