【NEWS RELEASE】
June 28, 2024
KADOKAWA CORPORATION

Notification and Apology Concerning
Information Leakage caused by the Ransomware Attack
KADOKAWA CORPORATION (Headquarters: Chiyoda-ku, Tokyo; Chief Executive Officer: Takeshi
Natsuno; hereinafter “KADOKAWA”) expresses deep apologies for the significant inconvenience and troublecaused to its readers, users, writers, creators, business partners, shareholders, investors, and otherstakeholders by the system failure currently affecting the KADOKAWA Group.
After the discovery of a significant cyberattack including ransomware on servers located in the data center,
the KADOKAWA Group promptly established a task force and commenced an ongoing investigation into thepossibility of information leakage with assistance including external professional organizations.
During the investigation, the organization that allegedly carried out the ransomware attack claimed that it
had caused a leakage of data in KADOKAWA's possession.
The KADOKAWA Group is in the process of confirming the authenticity of the cybercriminal organization'sclaim. However, upon verifying the data which the cybercriminal organization released, we have confirmed aleakage of some data held by KADOKAWA. Please see the report below.
The police have already begun an investigation. In addition, while providing the relevant authorities withnecessary reports, KADOKAWA is endeavoring to confirm the facts and take appropriate actions.
Note that KADOKAWA does not itself store credit card information on KADOKAWA Group customers,
including customers of Niconico services. This structure prevents the leakage of this information fromKADOKAWA.
In July, we expect to receive accurate information based on the findings of external professionalorganizations. We shall report this as soon as it is ascertained.
KADOKAWA reiterates its deepest apologies to our customers and all those concerned for theconsiderable inconvenience and trouble this matter has caused.
◆ Types of Confirmed Information Leakage (as of June 28, 2024)[Business Partner Information]●

Personal information of some creators who use music monetization services (NRC)●Information on companies operated by some former employees●

Contracts, estimates, and other documents exchanged with business partners[Internal Company Information]●

Personal information on all DWANGO Co., Ltd. employees (including contract workers, tempworkers, part-time workers, and some retired employees)●

Personal information on some employees of affiliated companies of DWANGO Co., Ltd.

●Internal documents◆ Notification to Affected Persons
We extend our apologies and shall individually notify outside creators, business partners, and former
employees whose information is confirmed as being affected by the leakage. Furthermore, we haveestablished a dedicated helpdesk for inquiries concerning this incident. We shall also explain the matter toour affected employees. For those who cannot be contacted individually, this announcement shall serve asnotification.
It is possible that such personal information will be maliciously exploited, and unsolicited email including
phishing mail and spam mail will be sent. Please take all precautions if you receive a suspicious email.
<Dedicated Helpdesk for Information Leakage Inquiries*>
https://qa.nicovideo.jp/helpdesk?category_id=982&faq_id=22764&site_domain=default*Japanese only

KADOKAWA reiterates its deepest apologies to our customers and all those concerned for theconsiderable inconvenience and trouble this matter has caused.
The KADOKAWA Group takes this incident very seriously. While proceeding with a more in-depth
investigation of the cause, we will further strengthen our information security systems to prevent a
recurrence and will take rigorous measures against ransomware attacks and other such criminal activity.

End of document
For media inquiries, please contact:
Investor and Public Relations Division, KADOKAWA CORPORATION
Email: pr-dept@kadokawa.jp

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