To Our Valued Customers

Thank you for your continued support.

We are writing to inform you of an incident involving unauthorized access (ransomware)
that caused a system outage in one of our systems.

We sincerely apologize for the significant concern and inconvenience this incident has caused
to all those affected.

[Current Status]

・All affected systems have been restored.
・Business operations have resumed as usual as of today.

[Impact on Customer Information]

At this time, we have not confirmed any leakage of the information provided by your company to external parties.
We are continuing our investigation and will report any changes in the situation promptly.

Regarding the cause of this incident, we are currently conducting a detailed investigation and analysis in collaboration with external specialized agencies.

At this time, we understand that the incident was likely caused by a combination of multiple factors,
rather than a single specific cause. Regarding our future response, we take this matter
very seriously and will continue to implement measures to prevent recurrence based on the investigation results.

We would like to once again apologize to all stakeholders for any concern this may have caused,
and we will continue to work as a group to strengthen our security
so that you can continue to do business with us with peace of mind.

If you have any questions regarding this matter, please contact
the inquiry point listed below. We appreciate your continued support.

[Inquiry Point / Contact]

Naigai Co., Ltd.

Naigai CSIRT Response Headquarters

csirt@naigaijp.com

Thank you for your continued use of our services.

Following our previous notification regarding the system outage, we have been conducting a joint investigation with external specialists. It has been determined that the cause was a ransomware attack.

We sincerely apologize for the inconvenience and concern this incident has caused.

【Details Revealed】

・Evidence of unauthorized access and ransomware infection has been confirmed

・Servers suspected of being affected have been isolated, and investigation into the attack vector is ongoing

・Restoration efforts are proceeding cautiously with safety as the top priority

【Impact on Customer Information】

At this time, no evidence of information leakage has been confirmed.

We will continue our investigation and promptly report any changes in the situation.

【Current Response Status】

・Containment of potentially infected devices

・Preparing system restoration using backup data

・Continuing log analysis

・Strengthening security measures (expanding monitoring, reviewing authentication settings, etc.)

We are handling this matter with a focus on safety and transparency.

We will provide updates on this page as developments occur.

We sincerely apologize for the continued inconvenience and appreciate your understanding.

【Contact Information / Responsible Department】

Naigai, CSIRT Headquarter

csirt@naigaijp.com

We are currently experiencing an outage in our systems and networks.

We are investigating the scope of the impact and working to restore services. We have also begun investigating the cause and developing measures to prevent recurrence.

We sincerely apologize for any concern and inconvenience this may cause to our stakeholders.

【1. Background】

The system and network outage was confirmed on the morning of Thursday, February 26.

To ensure a swift response, we have established an internal countermeasures headquarters.

【2. Current Status and Future Actions】

We are currently investigating the scope of the impact and working on restoration.

Regarding the possibility of information leakage to external parties, we are continuing our detailed investigation.

We will promptly report any progress on our company website and other channels as it becomes available.

【Contact information】

Naigai

CSIRT Headquarter

csirt@naigaijp.com