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UKH - HOF Kühn und Bauer Fachärzte für Urologie

listed as Ukh-hof.de · Claimed by Cloak · listed 2 years ago

100 GB
Data size
19m
Age
since listed · data leaked

Status timeline

  1. ListedDec 10, 2024
  2. Data leakeddate unknown

At a glance

Group
Cloak
Status
Data leaked
Country
Germany
Sector
Healthcare
Listed on leak site
Dec 10, 2024
Data size
100 GB

About the victim

AI dossier — public-source company profile

UKH-HOF is a urology specialist practice in Hof, Germany, led by Dr. Jens Kühn and Christoph H. Bauer. The practice operates as a comprehensive urology competence center offering diagnostic and surgical services including cancer treatment, incontinence management, and preventive care.

Industry
Healthcare & Medical Services - Urology
Address
Eppenreuther Str. 28, 95032 Hof/Saale, Germany

Attack summary

Severity: high — Healthcare provider with confirmed exfiltration of 100 GB of data. Patient medical records and health information constitute regulated sensitive data under GDPR and German healthcare law, creating significant privacy and compliance risk.

The Cloak ransomware group claims to have exfiltrated approximately 100 GB of data from UKH-HOF. The leak post provides minimal detail on the specific data categories or operational impact.

high

Data the group says was taken

AI dossier — extracted from the leak post
  • Patient medical records
  • Personal health information
  • Practice operational data
  • Administrative files

What the group claims

Ukh-hof.de Country: Germany Views: 56 View more /ukh Public <100GB

Sources

Source

Indexed 2 years 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 Cloak

Cloak is a relatively new ransomware group that emerged in August 2023, operating with primarily financial motivations and demonstrating a broad international targeting scope with 162 documented victims across multiple sectors. The group's origin and specific affiliations remain undocumented in public threat intelligence reporting, though their operational patterns suggest they may operate independently rather than as part of a larger ransomware-as-a-service ecosystem. Limited public documentation exists regarding their specific attack methodologies, encryption techniques, or data exfiltration practices, though their targeting patterns indicate sophisticated capabilities to compromise organizations across diverse sectors including business services, technology, healthcare, and manufacturing. The group has demonstrated a preference for targeting victims in English-speaking countries and Western Europe, with the United States, Germany, United Kingdom, Canada, and Italy representing their primary geographic focus areas. Cloak appears to remain active as of current reporting, though the relative scarcity of detailed public analysis from major threat intelligence firms suggests either operational security effectiveness or a lower profile compared to more established ransomware operations. The group has been linked to 166 public disclosures across our corpus. First observed on a leak site on August 24, 2023; most recent post June 18, 2026. The operation is currently active.

Timeline of this disclosure

  • December 10, 2024Ukh-hof.de listed by Cloakon the group's public leak site
Data size
100 GB

Other recent disclosures by Cloak

Cloak has been linked to 166 public victims on Darkfield. A sample of the most recent:

See the full Cloak dossier →

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 2,600 disclosures indexed across all operators we track. Geographically, Ukh-hof.de is reported in Germany, a country with 926 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Cloak means Ukh-hof.de 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 Cloak'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.