Was OneDealer hit by ransomware?

OneDealer was listed by the Hellcat ransomware operation (Germany), 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 Hellcat ransomware group?

Hellcat 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 OneDealer breach?

Hellcat published data attributed to OneDealer, around 330.000 records records. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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OneDealer

Claimed by Hellcat · listed 1 year ago

330.000 records

Records

16m

Age

since listed · data leaked

Status timeline

ListedFeb 28, 2025
Data leakeddate unknown

At a glance

Group: Hellcat
Status: Data leaked
Country: Germany
Listed on leak site: Feb 28, 2025
Records: 330.000 records

About the victim

AI dossier — public-source company profile

OneDealer is a B2B software platform providing automotive network management (ANM) solutions for OEMs, importers, and dealer groups. The company operates across Europe and the Middle East, supporting 50+ automotive networks and 1,000+ dealerships with digital sales, marketing, and after-sales management tools. It serves major automotive brands including Hyundai, BMW, Audi, Kia, and Škoda.

Industry: Automotive Software & Digital Transformation

Attack summary

Severity: critical — Exfiltration of 330,000+ records containing PII (customer data), vehicle identifiers (VINs/license plates), and business intelligence from a centralized automotive network platform affecting major OEMs and dealer groups. The scale, data sensitivity, and downstream impact on multiple regulated entities justifies critical classification.

Hellcat claims to have exfiltrated over 330,000 records from OneDealer's partner network, including sales reports, leads, customer data, vehicle identification numbers (VINs), and license plates. The breach exposed data from multiple automotive dealers and OEM partners stored within the platform.

critical

Data the group says was taken

AI dossier — extracted from the leak post

sales reports
sales leads
customer data
vehicle VINs
license plates
partner company information

What the group claims

We have obtained over 330,000 records from OneDealer partners, including sales reports, leads, customer data, and vehicle details with VINs and license plates. Affected companies include AutoHellas, AutoBesikos, KosmoCar, AWT, Karenta AE, QA, Proaxia, Hyundai, BMW, Audi, Kia,

Sources

Victim siteonedealer.com

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 Hellcat

Hellcat is a recently emerged ransomware group first observed in October 2024, operating with apparent financial motivations based on their targeting patterns across multiple high-value sectors. The group's origin and potential state affiliations remain unclear due to their recent emergence, though their broad geographic targeting spanning the United States, China, Germany, France, and Israel suggests either a sophisticated international operation or the use of ransomware-as-a-service infrastructure. Limited public documentation exists regarding Hellcat's specific attack methodologies, encryption techniques, or whether they employ double extortion tactics involving data exfiltration prior to encryption, as major cybersecurity firms and government agencies have yet to publish detailed technical analyses of their operations. With only 20 documented victims to date, the group has not yet conducted any widely publicized major campaigns or drawn significant law enforcement attention, though their targeting of technology, education, government, and business services sectors indicates a focus on organizations likely to possess valuable data and have strong incentives to pay ransoms. Hellcat remains active as of current reporting, though their limited operational footprint and recent emergence make long-term assessment of their capabilities and persistence difficult to determine. The group has been linked to 20 public disclosures across our corpus. First observed on a leak site on October 25, 2024; most recent post April 10, 2025. The operation is currently inactive.

Timeline of this disclosure

February 28, 2025OneDealer listed by Hellcaton the group's public leak site

Records: 330.000 records

Other recent disclosures by Hellcat

Hellcat has been linked to 20 public victims on Darkfield. A sample of the most recent:

See the full Hellcat dossier →

Sector and geography

Geographically, OneDealer is reported in Germany, a country with 926 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Hellcat means OneDealer 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-Bund (Germany), as required for your jurisdiction.
Monitor for the data appearing on Hellcat'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.