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Acos Favorit

Claimed by Rhysida · listed 1 year ago

10 TB
Data size
287 files records
14m
Age
since listed · data leaked

Status timeline

  1. ListedApr 22, 2025
  2. Data leakeddate unknown

At a glance

Group
Rhysida
Status
Data leaked
Country
Norway
Listed on leak site
Apr 22, 2025
Data size
10 TB
Records
287 files

About the victim

AI dossier — public-source company profile

Acos Favorit is listed as a victim name but the leak post is a aggregated disclosure of multiple unrelated victims by the Rhysida group. The post does not describe Acos Favorit itself.

Attack summary

Severity: critical — Bulk exfiltration of regulated data at scale including confirmed medical records (100,000+ patient PII with SSN, diagnoses, medical history), government records (tribal nations, sheriff, local government), school records, and aerospace/defence-adjacent data with named major contractors (Lockheed Martin, Boeing, Northrop Grumman, etc.). Multiple healthcare and government entities with sensitive PII.

Rhysida claims to have exfiltrated data from 36+ distinct organizations across diverse sectors (aerospace, government, healthcare, education, retail, professional services). The group states all files have been uploaded to public access.

critical

Data the group says was taken

AI dossier — extracted from the leak post
  • aerospace company records and partner data
  • government service documents
  • law enforcement records
  • patient medical records (100,000+ records at Spindletop Center)
  • school district records
  • financial and accounting files
  • business operational data

What the group claims

Acos Favorit Founded in 1996 by Rudolf Fritsch, Acos Favorit Distribuidora Ltda focuses on cutting and distributing special steels (tools), stainless bars, mechanical construction steels, structural beams and mechanical tubes.

The leak post

captured from the group's site
STELIA North America is an aerospace and defence company specializing in the design, development, and manufacturing of composites.10 TB of confidential data!Data from major partner companies, such as: Lockheed Martin, Northrop Grumman, Sikorsky, Leonardo, L3Harris, Airbus Atlantic, Boeing, Bombardier, De Havilland, ARDE, MDA.
Data Catalog: 9,3 Tb, 4 324 287 Files 
All files was uploaded to public access, data hunters, enjoy 
[Southold Town Senior ServicesSouthold Police Department](https://www.southoldtownny.gov)
The Town of Southold, New York provides various government services including forms and permits, online payments, and notifications for residents. Southold Police Department is a company that operates in the Local industry.
Data Catalog: 1,7 Tb, 767 693 Files 
All files was uploaded to public access, data hunters, enjoy 
Rohner designs and builds high-quality, custom paint booths and manufactured industrial paint systems. Our quality and service, cutting-edge technology, and engineering experience provide the best value in the finishing equipment industry.
Data Catalog: 3 Tb, 3 924 397 Files 
All files was uploaded to public access, data hunters, enjoy 
The Cheyenne and Ar…

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 Rhysida

Rhysida is a ransomware group that emerged in June 2023, operating with primarily financial motivations through targeted attacks against critical infrastructure and public sector organizations. The group's origin and potential state affiliations remain unclear, though they operate independently rather than as a traditional Ransomware-as-a-Service model, with limited public documentation regarding connections to other cybercriminal organizations. Rhysida employs double extortion tactics, typically gaining initial access through compromised VPN credentials and exploiting vulnerable public-facing applications before deploying their ransomware payload and exfiltrating sensitive data prior to encryption. The group has demonstrated a particular focus on healthcare and educational institutions, with notable attacks documented by CISA and FBI advisories highlighting their targeting of hospitals and school districts across multiple countries, resulting in significant operational disruptions to critical services. As of late 2024, Rhysida remains an active threat with continued operations targeting organizations primarily in the United States, Canada, and other Western nations, maintaining their focus on high-value sectors where operational disruption can maximize ransom payment likelihood. The group has been linked to 282 public disclosures across our corpus. First observed on a leak site on June 5, 2023; most recent post June 18, 2026. The operation is currently active.

Timeline of this disclosure

  • April 22, 2025Acos Favorit listed by Rhysidaon the group's public leak site
Data size
10 TB
Records
287 files

Other recent disclosures by Rhysida

Rhysida has been linked to 282 public victims on Darkfield. A sample of the most recent:

See the full Rhysida dossier →

Sector and geography

Geographically, Acos Favorit is reported in Norway, a country with 41 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Rhysida means Acos Favorit 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, NorCERT (Norway), as required for your jurisdiction.
  • Monitor for the data appearing on Rhysida'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.