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Response snapshot Oct 27, 2026, 00:12 UTC

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Disclosed incidentkadokawa-niconico-ransomware-2024

KADOKAWA and Niconico ransomware disruption

KADOKAWA confirms a June 8, 2024 ransomware attack affecting its data center and Niconico-related services. Its August 5, 2024 notice confirms leakage involving employees, business partners, and educational-institute stakeholders.

At a glance

Sources
1 source

What to do

Follow official individual notifications and dedicated helpdesks. Treat suspicious follow-up messages cautiously and avoid redistributing exposed personal information, as requested in KADOKAWA's notice.

Read KADOKAWA second report on system failure (opens a new tab)

What happened

The company presumes stolen employee credentials, possibly from phishing, were involved, while saying the exact route and method were unknown. It did not confirm leakage of Niconico login credentials. The reviewed corporate notices do not identify a ransomware gang or prove hypervisor power-control claims.

Related technology

Sources

  1. Primary source

    KADOKAWA second report on system failure (opens a new tab)

    June 8, 2024 event, ransomware confirmation, Niconico and publishing/accounting disruption, and initial uncertainty.

    Published Checked

  2. Primary source

    KADOKAWA notice concerning information leakage (opens a new tab)

    Confirmed leakage categories, credential-theft hypothesis, login-data caveat, notifications, and secondary-harm guidance.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2024, August 5). KADOKAWA and Niconico ransomware disruption. https://kevwire.com/record/kadokawa-niconico-ransomware-2024

MLA

"KADOKAWA and Niconico ransomware disruption." KEVWire, 5 Aug. 2024, kevwire.com/record/kadokawa-niconico-ransomware-2024.

Chicago

KEVWire. "KADOKAWA and Niconico ransomware disruption." Last modified August 5, 2024. https://kevwire.com/record/kadokawa-niconico-ransomware-2024.

Evidence summary (plain text)

KADOKAWA and Niconico ransomware disruption (Jun 14, 2024).
KADOKAWA confirms a June 8, 2024 ransomware attack affecting its data center and Niconico-related services. Its August 5, 2024 notice confirms leakage involving employees, business partners, and educational-institute stakeholders.
Sources:
KADOKAWA second report on system failure: https://group.kadokawa.co.jp/information/media-download/1337/a0a8256c542b707e/
KADOKAWA notice concerning information leakage: https://group.kadokawa.co.jp/information/media-download/1355/9d3bd5d77ffe0c4d/
Record ID: kadokawa-niconico-ransomware-2024.
Record origin: Editorial selection.
AI evidence: Not assessed.
About this data

This record was assembled editorially. Editorial review: Oct 26, 2026. Editorial selection does not make a reported claim independently confirmed.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

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