Was RÉSO hit by ransomware?

RÉSO was listed by the Dragonforce 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 Dragonforce ransomware group?

Dragonforce 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 RÉSO breach?

Dragonforce published data attributed to RÉSO. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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RÉSO

Claimed by Dragonforce · listed 5 hours ago

Today

Age

since listed · data leaked

Status timeline

ListedOct 7, 2026
Data leakeddate unknown

At a glance

Group: Dragonforce
Status: Data leaked
Country: France
Sector: Technology
Listed on leak site: Oct 7, 2026

About the victim

AI dossier — public-source company profile

RÉSO is a French distributor and partner specializing in second-fix building products and services. They supply ceilings, partitions, flooring, acoustic products, and cladding systems to construction projects across France, with multiple regional agencies.

Industry: Building Materials & Interior Finishes Distribution

Attack summary

Severity: low — Post contains only a malformed API request with no proof of data access, exfiltration, encryption, or impact. Does not constitute a credible attack announcement.

The leak post contains only a single API error message (400 Bad Request from an internal blog endpoint). No data exfiltration, encryption, or operational disruption is claimed or evidenced.

low

What the group claims

Réso specializes in secondary works, offering a wide range of products including ceilings, partitions, floors, technical floors, and facades. They provide modular and dry partitions, acoustic products, and various accessories, ensuring a comprehensive solution for construction needs. With numerous agencies across France and a team of specialists trained in the latest innovations, Réso serves a diverse clientele with thousands of available products. Their commitment to quality and service is reflected in their partnerships and significant projects. 676 GB of confidential information about their customers, partners, employees were stolen. The entire network was locked including nearly 8TB of Veeam backups. The company has failed to reach for an agreement.

The leak post

captured from the group's site

[GET] "http://blog-main_backend.local:2000/api/guest/blog/post?post_uuid=e7424f37-2786-42d1-a413-a7c88a8b1796": 400 Bad Request

Sources

Source

Indexed 5 hours 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 Dragonforce

Dragonforce is a relatively new ransomware group that emerged in December 2023, operating with apparent financial motivations based on their targeting patterns and victim selection. The group's origin and potential affiliations remain unclear due to limited public documentation from established threat intelligence sources, though their rapid accumulation of 439 documented victims suggests either sophisticated capabilities or possible connections to existing ransomware infrastructure. Based on their targeting patterns across diverse sectors including manufacturing, business services, technology, and construction, Dragonforce appears to employ opportunistic attack methodologies, though specific initial access vectors, encryption methods, and extortion tactics have not been publicly detailed by major security firms or law enforcement agencies. The group has demonstrated a preference for targeting organizations primarily in English-speaking countries and Western Europe, with the United States, United Kingdom, Germany, Australia, and Italy representing their most frequent victim locations, suggesting possible language capabilities or geographic operational preferences. As of current reporting, Dragonforce appears to remain active given their recent emergence and ongoing victim acquisition, though the lack of detailed public analysis from major threat intelligence organizations indicates either operational security measures that have limited researcher visibility or that the group has not yet conducted sufficiently high-profile attacks to warrant extensive public documentation by CISA, FBI, or established security research firms. The group has been linked to 677 public disclosures across our corpus. First observed on a leak site on December 13, 2023; most recent post October 7, 2026. The operation is currently active.

Also tracked as: DRAGON FORCE.

Timeline of this disclosure

October 7, 2026RÉSO listed by Dragonforce on the group's public leak site

Other recent disclosures by Dragonforce

Dragonforce has been linked to 677 public victims on Darkfield. A sample of the most recent:

See the full Dragonforce dossier →

Sector and geography

This disclosure adds to ransomware activity in the Technology sector, which has 3,581 disclosures indexed across all operators we track. Geographically, RÉSO is reported in France, a country with 242 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Dragonforce means RÉSO 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 Dragonforce'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.