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Ransomware Victim Consumer Services

Mandom Corporation

Ransomware attack by Worldleaks ยท Disclosed October 11, 2025 ยท ๐Ÿ‡ฏ๐Ÿ‡ต Japan

mandom.co.jp

Date Disclosed
Oct 11, 2025
2025
Threat Group
Worldleaks
177 total victims
Country
๐Ÿ‡ฏ๐Ÿ‡ต Japan
Industry
Consumer Services

Incident Analysis

Mandom Corporation was targeted by Worldleaks ransomware, one of the most active ransomware groups in our database with 177 confirmed victims globally. The attack was disclosed on October 11, 2025, when Mandom Corporation appeared on the group's dark web leak site.

Mandom Corporation is based in Japan , operating in the Consumer Services sector. Japan ranks #11 globally for ransomware attacks, with 252 victims in our database.

Sector context: Organisations in this sector hold valuable data and operational systems that ransomware groups seek to exploit for financial gain through encryption and data exfiltration.

Worldleaks typically employs a double extortion model: first exfiltrating sensitive data from the victim's systems, then deploying ransomware to encrypt files. Victims face two simultaneous threats โ€” paying to restore access and paying to prevent publication of stolen data. The group's leak site publishes victim names and exfiltrated data as leverage.

Data source: This incident record is sourced from public ransomware group leak site disclosures aggregated via the ransomware.live API. Disclosure date reflects when the victim was published on the leak site, which may differ from the initial date of compromise. This platform does not publish or link to stolen data. Last data update: Aug 4, 2026 12:00 UTC.

Frequently Asked Questions

Was Mandom Corporation attacked by ransomware?

Yes. Mandom Corporation was listed as a victim of the Worldleaks ransomware group on October 11, 2025. The organisation is based in Japan and operates in the Consumer Services sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Mandom Corporation?

Mandom Corporation was attacked by Worldleaks ransomware. Worldleaks is one of the most active ransomware groups, having claimed 177 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Mandom Corporation ransomware attack occur?

The ransomware attack on Mandom Corporation was disclosed on October 11, 2025. This date reflects when the victim was published on the threat group's leak site, which may differ from the actual date of initial compromise.

What data was stolen in the Mandom Corporation ransomware attack?

The specific data stolen from Mandom Corporation has not been independently verified by this platform. Ransomware groups typically exfiltrate data before encrypting systems and use the threat of publication to pressure victims. As a Consumer Services organisation, Mandom Corporation likely held sensitive business data, client information, and operational records.

How can organisations protect against Worldleaks attacks?

To defend against Worldleaks and similar threat actors, organisations should: maintain regular offline backups tested for restoration; implement network segmentation to limit lateral movement; deploy multi-factor authentication on all remote access; use endpoint detection and response (EDR) tools; conduct regular phishing and security awareness training; and monitor threat intelligence feeds for indicators of compromise (IOCs) associated with active groups.