Resonac: ransomware attack
Ransomware detected on May 20 led to network isolation and disruption of some operations, production and shipping. The August 6 final report announced completion of investigation and response, full malware removal and normal operations. Investigation found no major harm such as data leakage within its scope.
Disclosed
2025-05-20
Organizations involved
1
Leaked or at risk
Unknown
Downtime
Unknown
Timeline
- Detected, Disclosed 2025-05-20
- Resolved 2025-08-06
- 78 days
Attack or cause
- Method
- [Ransomware]
- Impact
- [Service outage]
- Entry point
- Unknown
Data exposed or at risk
–
Organizations involved
[Breached][Moderate]Tokyo, MinatoManufacturing
Resonac Corporation
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)Resonac Holdings Corporation · 2025-05-20
- [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(第四報)Resonac Holdings Corporation · 2025-06-03
- [3][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(最終報)Resonac Holdings Corporation · 2025-08-06