Was Osaka Motorcycle Business Cooperative hit by ransomware?

Osaka Motorcycle Business Cooperative was listed by the 8Base ransomware operation (Japan), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the 8Base ransomware group?

8Base is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Osaka Motorcycle Business Cooperative breach?

8Base published data attributed to Osaka Motorcycle Business Cooperative. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Osaka Motorcycle Business Cooperative

Claimed by 8Base · listed 2 years ago

25m

Age

since listed · data leaked

Status timeline

ListedMay 27, 2024
Data leakeddate unknown

At a glance

Group: 8Base
Status: Data leaked
Country: Japan
Sector: Transportation/Logistics
Listed on leak site: May 27, 2024

About the victim

AI dossier — public-source company profile

Osaka Motorcycle Business Cooperative (AJ Osaka) is a trade association operating in Osaka Prefecture, Japan. The organization conducts motorcycle auctions, group procurement, registration services, loan mediation, club management, welfare programs, and publishes trade publications. It also offers ancillary services including truck and bicycle rental.

Industry: Motorcycle Trade Association & Services
Address: Osaka Prefecture, Japan

Attack summary

Severity: low — No proof files, screenshots, or evidence of data exfiltration are advertised. The post contains only a listing of the organization's business functions without demonstrating access to sensitive data or operational disruption.

The 8Base group claims to have compromised Osaka Motorcycle Business Cooperative and published details of the organization's operations. No explicit statement of encryption, exfiltration, or ransom demand is present in the leak post.

low

Data the group says was taken

AI dossier — extracted from the leak post

Business operation details
Organizational structure information

What the group claims

Osaka Motorcycle Business CooperativeThe work of an auction for the sale of motorcycles.Group purchase of supplies for motorcycles.Motorcycle registration and registration business ETC.Mediation of a motorcycle loan.Management of the ZuttoRide ClubProcessing of the "Club AJ Card"Work related to the "Motorcycle Quality Evaluator"A business associated with an administrative agency for labor insurance.Conducting seminars on management and technology, as well as lectures on law, taxation and labor issues.Legal and labor diagnostics conducted by a consulting lawyer and a consultant on social insurance and labor.Work related to the welfare of union members.Transactions related to the mutual assistance system of group welfare.Publication of the motorcycle information magazine "Quarterly Report on Used Cars".The publication of the trade union newspaper "AJ Osaka Network Press".Rent trucks.Bicycle rental Business https://www.ajosaka.com

Sources

Victim siteajosaka.com
Leak posthttp://xb6q2aggycmlcrjtbjendcnnwpmmwbosqaugxsqb4nx6cmod3emy7sad.onion/company/7890455

Source

Indexed 2 years ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

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Disclosure context

About 8Base

8Base is a ransomware group that emerged in May 2023, operating with primarily financial motivations and demonstrating a rapid escalation in activity with 458 documented victims across multiple sectors. The group's origin and specific affiliations remain largely undocumented by major security agencies, though their operational patterns suggest they function as an independent ransomware operation targeting predominantly Western markets. Based on publicly available victim data, 8Base appears to focus on opportunistic attacks against business services and manufacturing sectors, with the United States representing their primary target geography, followed by France, Brazil, Italy, and the United Kingdom, indicating a preference for developed economies with established digital infrastructure. The group has notably impacted healthcare and technology sectors alongside their primary business services focus, suggesting a broad targeting approach rather than sector-specific specialization. Given the group's recent emergence in 2023 and continued victim accumulation across diverse geographic and sectoral targets, 8Base appears to remain active as of current reporting periods, though detailed technical methodologies, specific attack vectors, and notable high-profile campaigns have not been extensively documented in public threat intelligence reporting from major security agencies. The group has been linked to 458 public disclosures across our corpus. First observed on a leak site on May 23, 2023; most recent post February 1, 2025. The operation is currently inactive.

Timeline of this disclosure

May 27, 2024Osaka Motorcycle Business Cooperative listed by 8Baseon the group's public leak site

Other recent disclosures by 8Base

8Base has been linked to 458 public victims on Darkfield. A sample of the most recent:

See the full 8Base dossier →

Sector and geography

This disclosure adds to ransomware activity in the Transportation/Logistics sector, which has 1,081 disclosures indexed across all operators we track. Geographically, Osaka Motorcycle Business Cooperative is reported in Japan, a country with 220 ransomware disclosures in our corpus.

If your organisation is affected

A listing by 8Base means Osaka Motorcycle Business Cooperative appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Report the incident to your national CERT, JPCERT/CC (Japan), as required for your jurisdiction.
Monitor for the data appearing on 8Base's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.