Disclosure context

About Sarcoma

Sarcoma is a relatively new ransomware group that emerged in October 2024, operating with apparent financial motivations and demonstrating a broad international targeting approach with at least 140 documented victims across multiple countries and industry sectors. The group's origin and affiliations remain unclear due to its recent emergence, with no publicly documented connections to established ransomware families or confirmation of whether they operate as an independent entity or through a Ransomware-as-a-Service model. Limited public information is available regarding Sarcoma's specific attack methodologies, initial access vectors, or technical capabilities, though their targeting patterns suggest opportunistic rather than highly selective victim selection across diverse industries including manufacturing, business services, agriculture and food production, and technology sectors. The group has shown a particular focus on victims in the United States while also maintaining operations against targets in Italy, Canada, Germany, and Australia, though no specific high-profile attacks or record ransom demands have been publicly documented by major security firms or law enforcement agencies. Given the group's recent emergence in late 2024, Sarcoma appears to remain active with no reported law enforcement disruptions or confirmed rebranding activities at this time. The group has been linked to 150 public disclosures across our corpus. First observed on a leak site on October 9, 2024; most recent post May 12, 2026. The operation is currently active.

Also tracked as: Sarcoma Ransomware Group.

Timeline of this disclosure

September 17, 2025Kwg listed by Sarcomaon the group's public leak site

Data size: 989 GB

Sector and geography

This disclosure adds to ransomware activity in the Not Found sector, which has 4,859 disclosures indexed across all operators we track. Geographically, Kwg is reported in Germany, a country with 695 ransomware disclosures in our corpus.

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.

Ransomware victim disclosure

← All victims

KWG mbH im Lausitzer Seenland

listed as Kwg · Claimed by Sarcoma · listed 8 months ago

989 GB

Data size

Age

since listed · data leaked

Status timeline

Listed
Sep 17, 2025
Data leaked

At a glance

Group: Sarcoma
Status: Data leaked
Country: Germany
Sector: Not Found
Listed on leak site: Sep 17, 2025
Data size: 989 GB

About the victim

AI dossier — public-source company profile

KWG mbH im Lausitzer Seenland is a housing service company that rents and manages residential and commercial properties in the Senftenberg region of Germany, including surrounding municipalities such as Großräschen, Schipkau, Schwarzheide, and Ortrand. The company offers a range of housing options for families, students, seniors, and singles, with customisable floor plans. It operates as a modern, progressive provider of affordable and higher-end accommodations in the Lausitz lake district area.

Industry: Residential & Commercial Property Management
Address: Senftenberg, Brandenburg, Germany

Attack summary

Severity: high — 989 GB of confirmed exfiltrated and published data from a property management company likely contains substantial PII (tenant identities, addresses, financial/payment details) and business records, constituting significant regulated personal data exposure at scale.

The Sarcoma ransomware group claims to have exfiltrated 989 GB of data from KWG mbH im Lausitzer Seenland and has published the data as a disclosed leak. No ransom amount was stated.

high

Data the group says was taken

AI dossier — extracted from the leak post

Tenant personal records
Residential and commercial lease agreements
Financial and billing data
Property management documents
Employee records
Internal business correspondence

What the group claims

Kwg KWG mbH im Lausitzer Seenland is a modern and progressive housing service company that rents and manages residential and commercial properties in the Senftenberg region and surrounding areas. They offer a variety of housing options tailored to different needs, including affordable apartments for families, students, and seniors, as well as higher-end accommodations. The company aims to provide suitable living spaces for singles, young people, families, and seniors, with the possibility of customizing floor plans. Their services are designed to meet the diverse demands of their clients in Senftenberg, Großräschen, Schipkau, Schwarzheide, and Ortrand.Geo: Germany - Leak size: 989 GB Archive - Contains: Files, SQL, Exchange

The leak post

captured from the group's site

Site: https://gyf.com.ar/ Industry: Business Services GEO: Argentina 
Site: www.propanelevac.ca Industry: Gas Stations, Retail GEO: Canada 
Site: www.mecmatica.it Industry: Provider of software solutions GEO: Italy 
Site: bedachungen-soellner.de Industry: Commercial & Residential Construction GEO: Germany 
Site: charterindustrial.com Industry: Industrial Machinery & Equipment GEO: USA 
Site: msbuilders.com Industry: Commercial & Residential Construction GEO: USA 
Site: thermofin.de Industry: Building Materials GEO: Germany 
Site: miamimanagement.com Industry: Business Services GEO: USA 
Site: kwg-senftenberg.de Industry: Business Services GEO: Germany 
Site: f1-generation.com Industry: Apparel & Accessories Retail GEO: Germany 
Site: inoxlaghi.com Industry: Industrial Machinery & Equipment GEO: Italy 
Site: maselli.com Industry: Manufacturing innovative optical technology GEO: Italy 
Site: metroheatingandair.com Industry: Commercial & Residential Construction GEO: USA 
Site: hv.com.co Industry: Food & Beverage GEO: Colombia 

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Design and develop IT products and services for the financial market
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Propane Levac inc. specializes in the distribution of propane across Ontari…

Source

Indexed 8 months 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.