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Gruppe Lehnen

Claimed by Nova · listed 9 months ago

350 GB
Data size
8m
Age
since listed · data leaked

Status timeline

  1. ListedOct 20, 2025
  2. Data leakeddate unknown

At a glance

Group
Nova
Status
Data leaked
Country
Germany
Listed on leak site
Oct 20, 2025
Data size
350 GB

About the victim

AI dossier — public-source company profile

Gruppe Lehnen is a family-owned civil engineering and road construction company headquartered in Sehlem, Germany, with over 90 years of experience in the sector. The company employs more than 270 qualified staff and operates quarrying/hard-stone works in addition to its core earthworks and road-building activities. It serves as a regional contractor and supplier of construction materials.

Industry
Civil Engineering & Road Construction
Address
Sehlem, Germany
Employees
270

Attack summary

Severity: high — 350 GB of documents have been confirmed exfiltrated and published, representing significant business data including financial/compliance documents (tax certificates, price lists) and likely employee and project records from a mid-sized construction firm. The disclosed status is data_published, confirming actual data release rather than a mere listing.

The nova ransomware group claims to have exfiltrated 350 GB of documents from Gruppe Lehnen and has published the data, instructing the victim to make contact via a readme file.

high

Data the group says was taken

AI dossier — extracted from the leak post
  • Internal business documents
  • Price lists (Hartsteinwerke quarry products)
  • Pre-qualification certificates
  • Company brochures
  • Tax exemption certificates (Freistellungsbescheinigungen)
  • Operational/project files (inferred from 350 GB volume)

What the group claims

Wir bauen für Ihre Zukunft. Die Gruppe mit Stammsitz in Sehlem weist bereits 90 Jahre Erfahrung im Tief- und Straenbau auf. Als modernes und leistungsfhiges Familienunternehmen mit heute über 270 qualifizierten Mitarbeitern sind wir dank jahrzehntelanger Erfahrung zuverlssiger und kompetenter Partner im Tief- und Straenbau. Mit dem Laden des Videos akzeptieren Sie die Datenschutzerklrung von YouTube. Unser kompetentes und hochmotiviertes Team braucht Unterstützung. Sollten wir für ein Stellenangebot Ihr Interesse geweckt haben, so freuen wir uns auf Ihre schriftliche Bewerbung. Für weitere Informationen klicken Sie bitte auf das jeweilige Stellenangebot. Das Downloadcenter hlt immer die wichtigsten und aktuellsten Dokumente Für Sie bereit. Hier finden Sie die aktuellen Preislisten unserer Hartsteinwerke, die Prqualifizierungsbesttigung, Broschüren zum Leistungsspektrum, unsere gültigen Freistellungsbescheinigungen und noch vieles mehr. Schauen Sie einfach mal rein - 350 GB of documents stolen , get in touch by follow readme

Sources

Source

Indexed 9 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 nova

Based on the limited available data, Nova is a recently emerged ransomware operation first observed in April 2025 with an apparent financial motivation, having targeted approximately 95 victims in its brief operational period. The group's origin and potential affiliations remain undocumented by major security firms, though their targeting pattern suggests a broad opportunistic approach rather than geopolitically motivated attacks. Nova's attack methodology and specific technical capabilities have not been publicly detailed by established threat intelligence sources, though their victim distribution across the United States, France, Brazil, Singapore, and the Netherlands indicates either automated widespread targeting or access to diverse initial compromise vectors. The group has demonstrated a preference for targeting healthcare, technology, manufacturing, and education sectors, suggesting they may focus on organizations with critical operational dependencies that increase pressure for ransom payment. Given the group's recent emergence and limited public documentation by major security researchers, Nova's current operational status, organizational structure, and long-term threat trajectory remain largely uncharacterized in established threat intelligence reporting. The group has been linked to 183 public disclosures across our corpus. First observed on a leak site on April 28, 2025; most recent post July 10, 2026. The operation is currently active.

Timeline of this disclosure

  • October 20, 2025Gruppe Lehnen listed by novaon the group's public leak site
Data size
350 GB

Other recent disclosures by nova

nova has been linked to 183 public victims on Darkfield. A sample of the most recent:

See the full nova dossier →

Sector and geography

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

If your organisation is affected

A listing by nova means Gruppe Lehnen 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 nova'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.