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KWG mbH im Lausitzer Seenland

listed as Kwg · Claimed by Sarcoma · listed 10 months ago

989 GB
Data size
10m
Age
since listed · data leaked

Status timeline

  1. ListedSep 17, 2025
  2. Data leakeddate unknown

At a glance

Group
Sarcoma
Status
Data leaked
Country
Germany
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 10 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.

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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

Other recent disclosures by Sarcoma

Sarcoma has been linked to 150 public victims on Darkfield. A sample of the most recent:

See the full Sarcoma dossier →

Sector and geography

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

If your organisation is affected

A listing by Sarcoma means Kwg 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 Sarcoma'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.