Cyber Threat Intelligence
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Ransomware Victim Manufacturing

TOMOKU CO., LTD.

Ransomware attack by Gunra · Disclosed May 4, 2025 · 🇯🇵 Japan

tomoku.co.jp

Date Disclosed
May 4, 2025
2025
Threat Group
Gunra
54 total victims
Country
🇯🇵 Japan
Industry
Manufacturing

ThreatAI Analysis

Compiled from this incident record and the threat intelligence profile for Gunra. Figures and technique mappings are quoted from the source data, not inferred.

About the Gunra group

Gunra is a financially motivated ransomware group that emerged in April 2025, using double-extortion tactics against real estate, pharmaceuticals, and manufacturing sectors across Japan, Egypt, Panama, Italy, and Argentina, deploying separate Windows and Linux variants with a strict five-day payment deadline. Gunra has listed 54 victims since April 2025.

Incident Analysis

TOMOKU CO., LTD. was targeted by Gunra ransomware, one of the most active ransomware groups in our database with 54 confirmed victims globally. The attack was disclosed on May 4, 2025, when TOMOKU CO., LTD. appeared on the group's dark web leak site.

TOMOKU CO., LTD. is based in Japan , operating in the Manufacturing sector. Japan ranks #11 globally for ransomware attacks, with 274 victims in our database.

Sector context: Manufacturing companies are frequently targeted because production downtime directly translates to financial loss. Ransomware operators exploit this time-sensitivity to demand higher ransoms and faster payment.

Gunra 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 — 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: Sep 19, 2026 06:00 UTC.

Frequently Asked Questions

Was TOMOKU CO., LTD. attacked by ransomware?

Yes. TOMOKU CO., LTD. was listed as a victim of the Gunra ransomware group on May 4, 2025. The organisation is based in Japan and operates in the Manufacturing sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked TOMOKU CO., LTD.?

TOMOKU CO., LTD. was attacked by Gunra ransomware. Gunra is one of the most active ransomware groups, having claimed 54 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the TOMOKU CO., LTD. ransomware attack occur?

The ransomware attack on TOMOKU CO., LTD. was disclosed on May 4, 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 TOMOKU CO., LTD. ransomware attack?

The specific data stolen from TOMOKU CO., LTD. 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 Manufacturing organisation, TOMOKU CO., LTD. likely held sensitive business data, client information, and operational records.

How can organisations protect against Gunra attacks?

To defend against Gunra 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.