high severity June 08, 2024 · 4 min read Unverified claim — what this is

KADOKAWA Corporation Listed by blacksuit Ransomware Group

If you are a customer of KADOKAWA Corporation, here’s what is being claimed, and what it would mean for you.

Our team gained access to the Kadokawa network almost a month ago. It took some time, because of the language, to figure out that Kadokawa subsidiaries' networks were connected to each other and to get through all the mess Kadokawa's IT department made there. We have discovered that Kadokawa networks architecture was not organised properly. It was different networks connected to the one big Kadokawas infrastructure being controlled through global control points, such as eSXI and V-sphere. Once we have gained access to the control center we have encrypted the whole network (Dwango, NicoNico, Ka
— from Blacksuit’s own leak-site posting. This is the group’s claim, quoted verbatim; it is not GalaxyWarden’s reporting and has not been independently verified.

KADOKAWA Corporation Listed by blacksuit Ransomware Group

On June 08, 2024, Japanese media and technology giant KADOKAWA Corporation appeared on the leak site of the blacksuit ransomware group. The listing states that the attackers first gained access to the Kadokawa network nearly a month earlier, eventually compromising the company’s central infrastructure and encrypting systems belonging to subsidiaries including Dwango and NicoNico. The disclosure indicates that internal files were exfiltrated prior to encryption, though the exact volume and specific types of data remain unknown.

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Details in the Primary Listing

The blacksuit leak-site entry explains that the intrusion was slowed by language barriers and the tangled architecture of Kadokawa’s environment. According to the posting, multiple subsidiary networks fed into a single large infrastructure controlled through global points such as ESXi and vSphere. Once the attackers reached the central control systems they encrypted the entire network. The listing does not quantify how many records were taken, nor does it publish samples of the allegedly stolen files. It simply asserts that internal data was removed before the ransomware was deployed.

Why This Matters for You and Your Family

Even without a precise count of affected individuals, the breach carries direct consequences for anyone who has an account with NicoNico, uses Dwango services, or has interacted with Kadokawa’s publishing, gaming, or streaming platforms. Internal files taken in such attacks frequently contain customer information, support tickets, payment details, or employee records that can be repurposed for identity theft or targeted phishing. If your email, username, or password linked to any Kadokawa service appears in the stolen material, it can be sold or published at any time. Ordinary users and their families are the ones left dealing with the downstream fraud, account takeovers, and unwanted contact that follow these leaks.

Doxxing and Identity-Chain Risks

Ransomware operators rarely stop at one dataset. A single exposed email or username from Kadokawa can be correlated with gaming accounts, social-media handles, and personal details found in other breaches, creating a chain that leads to full doxxing. Children’s NicoNico or gaming profiles are especially vulnerable because parents often reuse credentials across family devices. Once attackers link a child’s handle to a parent’s real identity and home address, the risk of harassment, swatting, or extortion rises sharply. Credential leaks like this one cascade into account takeovers that can compromise every linked service.

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value redacted in this sampleage, relatives, address historySpokeo

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verifiedvalue redacted in this samplepassword + phone · 2024telecom breach

unverifiedvalue redacted in this sampleclaimed in ransomware listing · 2026leak-site claim

Leaked data cannot be deleted from the internet — anyone claiming otherwise is lying. Broker listings can be removed. We do the second, and show you exactly what to fix from the first.

Report details & sourcing

Attributed to Blacksuit · 183 incidents tracked →

Severity High the filing does not enumerate what was exposed

Disclosed June 08, 2024

Last reviewed August 8, 2026

Affected Unconfirmed

By GalaxyWarden Threat Research · Editorial & sourcing standards

Unverified claim — what this report is

This page documents a public listing on a ransomware/extortion group’s leak site, tracked via public threat-intelligence sources. A listing is the attacker’s claim. GalaxyWarden aggregates and reports such claims; we have not independently verified that a breach occurred, what data (if any) was taken, or the accuracy of anything the group asserts, and the named organisation has not necessarily confirmed the incident. Sections above describe what the listing shows and the group’s documented history — not verified findings about the named organisation. If you represent this organisation and believe anything here is inaccurate, tell us and we’ll review it promptly.

Editorial & sourcing policy

GalaxyWarden is a breach-monitoring service and news aggregator. We do not exfiltrate, host, purchase, or redistribute stolen data. Breach information is compiled from publicly accessible sources and threat-intelligence platforms, and is reported as claims attributed to their source. We promptly correct or remove material shown to be inaccurate — see our content & takedown policy or write to support@galaxywarden.com.

Threat-actor tracker

Blacksuit — 183 incidents tracked

Every breach we've attributed to Blacksuit, in one running log. See who else they've hit →

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