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Ransomware Victim Consumer Services

OneDealer

Ransomware attack by Hellcat · Disclosed February 28, 2025 · 🇩🇪 Germany

onedealer.com

Date Disclosed
Feb 28, 2025
2025
Threat Group
Hellcat
20 total victims
Country
🇩🇪 Germany
Industry
Consumer Services

ThreatAI Analysis

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

About the Hellcat group

HellCat is a ransomware-as-a-service group that formed in Q4 2024 and quickly became notable for high-profile attacks against Schneider Electric, Telefónica, and Israel's Knesset, primarily gaining initial access via stolen Jira credentials harvested by infostealer malware, targeting critical infrastructure and government entities. Hellcat has listed 20 victims since October 2024.

Incident Analysis

OneDealer was targeted by Hellcat ransomware, one of the most active ransomware groups in our database with 20 confirmed victims globally. The attack was disclosed on February 28, 2025, when OneDealer appeared on the group's dark web leak site.

OneDealer is based in Germany , operating in the Consumer Services sector. Germany ranks #2 globally for ransomware attacks, with 914 victims in our database.

Sector context: Organisations in this sector hold valuable data and operational systems that ransomware groups seek to exploit for financial gain through encryption and data exfiltration.

Hellcat typically employs a double extortion model: first exfiltrating sensitive data from the victim's systems, then deploying ransomware to encrypt files. Victims face two simultaneous threats — paying to restore access and paying to prevent publication of stolen data. The group's leak site publishes victim names and exfiltrated data as leverage.

Data source: This incident record is sourced from public ransomware group leak site disclosures aggregated via the ransomware.live API. Disclosure date reflects when the victim was published on the leak site, which may differ from the initial date of compromise. This platform does not publish or link to stolen data. Last data update: Sep 6, 2026 20:00 UTC.

Frequently Asked Questions

Was OneDealer attacked by ransomware?

Yes. OneDealer was listed as a victim of the Hellcat ransomware group on February 28, 2025. The organisation is based in Germany and operates in the Consumer Services sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked OneDealer?

OneDealer was attacked by Hellcat ransomware. Hellcat is one of the most active ransomware groups, having claimed 20 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the OneDealer ransomware attack occur?

The ransomware attack on OneDealer was disclosed on February 28, 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 OneDealer ransomware attack?

The specific data stolen from OneDealer 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 Consumer Services organisation, OneDealer likely held sensitive business data, client information, and operational records.

How can organisations protect against Hellcat attacks?

To defend against Hellcat 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.