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Cyber Threat
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Ransomware victim Energy

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

Listed by J on · organisation based in Japan

petrodiamond.com

Disclosed
Sep 29, 2025
Leak-site listing date
Threat group
J
41 victims listed
Country
Japan
#11 most targeted
Sector
Energy

ThreatAI analysis

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

About the J group

J is an emerging ransomware group that launched its leak site in May 2025, claiming over 41 victims by late 2025 including FAI Aviation Group (Germany), operating primarily as a leak-site-centric extortion identity with limited public technical analysis. J has listed 41 victims since February 2025.

Incident analysis

Petro-Diamond (petrodiamond.com) - subsidiary of Mitsubishi Corporation was listed by J ransomware, a group with 41 victims recorded in this database. The listing appeared on the group's leak site on September 29, 2025.

Petro-Diamond (petrodiamond.com) - subsidiary of Mitsubishi Corporation is based in Japan and operates in the Energy sector. Japan ranks #11 worldwide for ransomware disclosures, with 306 victims in this 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 follows a double extortion model: data is exfiltrated from the victim's systems before files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished. The leak site, where this listing appeared, is the lever for the second demand.

Source. Public leak-site disclosures aggregated via the ransomware.live API. The disclosure date is when the listing was published, which can differ from the date of compromise. This site does not publish or link to stolen data. Last updated .

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.