Ransomware Incident at a Company Subsidiary
株式会社マムクリエイト (our consolidated subsidiary)
Some of 株式会社マムクリエイト's internal servers and internal systems
Encryption by ransomware. The cause is under investigation.
Related procedures
Report to the police and an investigation conducted in cooperation with external experts and the police
Police and the Personal Information Protection Commission (a report will be made as necessary)
Company response
Some internal systems have been disconnected from the servers. Services provided to customers, the website and email systems remain available as usual.
An investigation conducted with the support and cooperation of external experts and in cooperation with the police. Information regarding a third-party committee or special investigation committee is Not disclosed.
No impact on financial results is expected. If it is determined that the incident will have a material impact on financial results, the company will make a timely disclosure.
The company will continue its investigation in cooperation with external experts and the police and work to protect and restore the systems. It will report to the Personal Information Protection Commission as necessary. If it is determined that the incident will have a material impact on financial results, the company will make a timely disclosure.
If a report on subsequent developments is required, it will be provided on the マムクリエイト website or through other channels.
| Item | Details |
|---|---|
| Event name | Ransomware Incident at a Company Subsidiary |
| Date of occurrence | 7 April 2026 (Tuesday) (the date on which the incident was confirmed; the actual date of occurrence is Not disclosed) |
| Date recognized / date notice received | 7 April 2026 (Tuesday) (the date on which 株式会社マムクリエイト confirmed the incident) |
| Subject Entity | 株式会社マムクリエイト (our consolidated subsidiary) |
| Target Locations / Products | Some of 株式会社マムクリエイト's internal servers and internal systems |
| Cause | Encryption by ransomware. The cause is under investigation. |
| Impact on Earnings Forecast | No impact on financial results is expected. If it is determined that the incident will have a material impact on financial results, the company will make a timely disclosure. |
| Type of litigation or proceeding | Report to the police and an investigation conducted in cooperation with external experts and the police |
| Court or authority | Police and the Personal Information Protection Commission (a report will be made as necessary) |
| Suspended operations | Some internal systems have been disconnected from the servers. Services provided to customers, the website and email systems remain available as usual. |
| Investigation structure | An investigation conducted with the support and cooperation of external experts and in cooperation with the police. Information regarding a third-party committee or special investigation committee is Not disclosed. |
| Outlook | The company will continue its investigation in cooperation with external experts and the police and work to protect and restore the systems. It will report to the Personal Information Protection Commission as necessary. If it is determined that the incident will have a material impact on financial results, the company will make a timely disclosure. |
| Planned follow-up disclosure | If a report on subsequent developments is required, it will be provided on the マムクリエイト website or through other channels. |
Items this document does not state (12)
These are items the company does not state in this document. We do not leave them blank, nor fill them in from other sources or by inference.
The reasons the company gives
The company's own explanation, not something inferred from the numbers.Some of 株式会社マムクリエイト's internal servers were encrypted by ransomware. The root cause and scope of the damage are under investigation.