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Ransomware Victim Energy

Petro-Diamond (petrodiamond.com) - subsidiary of Mitsubishi Corporation

Ransomware attack by J Β· Disclosed September 29, 2025 Β· πŸ‡―πŸ‡΅ Japan

petrodiamond.com

Date Disclosed
Sep 29, 2025
2025
Threat Group
J
41 total victims
Country
πŸ‡―πŸ‡΅ Japan
Industry
Energy

Incident Analysis

Petro-Diamond (petrodiamond.com) - subsidiary of Mitsubishi Corporation was targeted by J ransomware, one of the most active ransomware groups in our database with 41 confirmed victims globally. The attack was disclosed on September 29, 2025, when Petro-Diamond (petrodiamond.com) - subsidiary of Mitsubishi Corporation appeared on the group's dark web leak site.

Petro-Diamond (petrodiamond.com) - subsidiary of Mitsubishi Corporation is based in Japan , operating in the Energy sector. Japan ranks #11 globally for ransomware attacks, with 251 victims in our database.

Sector context: Energy sector attacks can have critical infrastructure implications. Ransomware on operational technology (OT) networks can disrupt power generation and distribution, elevating the urgency of recovery.

J 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 β€” 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 2, 2026 22:00 UTC.

Frequently Asked Questions

Was Petro-Diamond (petrodiamond.com) - subsidiary of Mitsubishi Corporation attacked by ransomware?

Yes. Petro-Diamond (petrodiamond.com) - subsidiary of Mitsubishi Corporation was listed as a victim of the J ransomware group on September 29, 2025. The organisation is based in Japan and operates in the Energy sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Petro-Diamond (petrodiamond.com) - subsidiary of Mitsubishi Corporation?

Petro-Diamond (petrodiamond.com) - subsidiary of Mitsubishi Corporation was attacked by J ransomware. J is one of the most active ransomware groups, having claimed 41 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Petro-Diamond (petrodiamond.com) - subsidiary of Mitsubishi Corporation ransomware attack occur?

The ransomware attack on Petro-Diamond (petrodiamond.com) - subsidiary of Mitsubishi Corporation was disclosed on September 29, 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 Petro-Diamond (petrodiamond.com) - subsidiary of Mitsubishi Corporation ransomware attack?

The specific data stolen from Petro-Diamond (petrodiamond.com) - subsidiary of Mitsubishi 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 Energy organisation, Petro-Diamond (petrodiamond.com) - subsidiary of Mitsubishi Corporation likely held sensitive business data, client information, and operational records.

How can organisations protect against J attacks?

To defend against J 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.