System Failures Caused by Cyberattacks
OMIKENSHI CO.,LTD. (filing company)
The Company's network, core systems, servers and file servers
Unauthorized access by an external third party. The Company believes that its network was highly likely to have been breached via VPN and that the attack was highly likely to have involved ransomware.
Company response
Shutdown of core systems and disconnection of the internal network and Internet connections
Forensic investigation with the assistance of external experts. A company-wide response team has been established.
The Company will further strengthen its security and monitoring systems and undertake company-wide efforts to prevent a recurrence.
Fiscal year ending March 2026 (the impact is under review)
Related procedures
Police (report and consultation)
The Company will continue its investigation with the assistance of external experts and proceed with measures aimed at recovery. If new information or other developments come to light, the Company will promptly announce them on its website. The Company will strengthen its security and monitoring systems.
| Item | Details |
|---|---|
| Event name | System Failures Caused by Cyberattacks |
| Date of occurrence | Late night on 16 March 2026 (the date of the unauthorized access; the date on which the Company became aware of it is Not disclosed) |
| Subject Entity | OMIKENSHI CO.,LTD. (filing company) |
| Target Locations / Products | The Company's network, core systems, servers and file servers |
| Cause | Unauthorized access by an external third party. The Company believes that its network was highly likely to have been breached via VPN and that the attack was highly likely to have involved ransomware. |
| Accounting period in which recognized | Fiscal year ending March 2026 (the impact is under review) |
| Court or authority | Police (report and consultation) |
| Suspended operations | Shutdown of core systems and disconnection of the internal network and Internet connections |
| Investigation structure | Forensic investigation with the assistance of external experts. A company-wide response team has been established. |
| Measures to prevent recurrence | The Company will further strengthen its security and monitoring systems and undertake company-wide efforts to prevent a recurrence. |
| Outlook | The Company will continue its investigation with the assistance of external experts and proceed with measures aimed at recovery. If new information or other developments come to light, the Company will promptly announce them on its website. The Company will strengthen its security and monitoring systems. |
| Planned follow-up disclosure | If new information or other developments come to light, the Company will promptly announce them on its website. |
Items this document does not state (13)
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.The Company was subject to unauthorized access by an external third party, causing its core systems to shut down and files on servers and file servers to be encrypted. The Company explains that the network was highly likely to have been breached via VPN and that the attack was highly likely to have involved ransomware.