Was diffazur.fr hit by ransomware?

diffazur.fr was listed by the J ransomware operation (France), 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 J ransomware group?

J 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 diffazur.fr breach?

J published data attributed to diffazur.fr. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Diffazur

listed as diffazur.fr · Claimed by J · listed 1 year ago

12m

Age

since listed · data leaked

Status timeline

ListedJun 20, 2025
Data leakeddate unknown

At a glance

Group: J
Status: Data leaked
Country: France
Sector: Construction
Listed on leak site: Jun 20, 2025

About the victim

AI dossier — public-source company profile

Diffazur is a leading French company specializing in the design and construction of customized concrete swimming pools with over 50 years of experience. They provide pool design, installation, maintenance, and renovation services.

Industry: Swimming Pool Design & Manufacturing
Employees: 51-200

Attack summary

Severity: low — Data has been published (disclosed_status confirms this), but no proof files, screenshots, or specific data inventory are evident in the truncated post excerpt. No operational impact or specific sensitive data types are stated.

The ransomware group claims to have attacked Diffazur and published data. No specific details on encryption, exfiltration scope, or data types are provided in the available post excerpt.

low

Original description

AI-summarised, not from the leak post

Diffazur is one of the leading French companies that specializes in designing and building customized, concrete swimming pools. With over 50 years of experience, Diffazur incorporates creativity, quality work, and technical expertise to deliver unique and sustainable pool solutions. They also provide pool maintenance and renovation services.

Sources

Source

Indexed 1 year 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 J

The J ransomware group is a newly emerged threat actor first observed in May 2025, operating with apparent financial motivations based on their targeting patterns across multiple countries and sectors. With limited public documentation available from established security research organizations, the group has demonstrated rapid operational capability by compromising 41 known victims within their initial months of activity. Their targeting strategy appears opportunistic, focusing primarily on organizations in the United States, United Kingdom, France, Argentina, and Germany, with a particular emphasis on technology companies, manufacturing firms, construction businesses, and business services providers. The diversity of their geographic and sectoral targeting suggests either a broad-spectrum approach to victim selection or potential use of automated tools for initial compromise identification. Given the recent emergence of this group and limited reporting from major cybersecurity firms and law enforcement agencies, specific details regarding their technical methodologies, ransom demands, data exfiltration practices, or organizational structure remain undocumented in publicly available threat intelligence. The group remains active as of current reporting periods, though their relative obscurity in established threat intelligence databases suggests they may be operating at a smaller scale compared to more prominent ransomware-as-a-service operations. The group has been linked to 41 public disclosures across our corpus. First observed on a leak site on May 2, 2025; most recent post November 9, 2025. The operation is currently inactive.

Timeline of this disclosure

June 20, 2025diffazur.fr listed by Jon the group's public leak site

Other recent disclosures by J

J has been linked to 41 public victims on Darkfield. A sample of the most recent:

See the full J dossier →

Sector and geography

This disclosure adds to ransomware activity in the Construction sector, which has 988 disclosures indexed across all operators we track. Geographically, diffazur.fr is reported in France, a country with 612 ransomware disclosures in our corpus.

If your organisation is affected

A listing by J means diffazur.fr 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, CERT-FR (France), as required for your jurisdiction.
Monitor for the data appearing on J'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.