Disclosure context

About blackwater

Based on the limited available data, Blackwater is an obscure ransomware operation that first emerged in April 2026, with only one documented victim to date, suggesting either a very new or small-scale financially motivated cybercriminal group. The group appears to operate primarily in Turkey, specifically targeting the healthcare sector based on their singular known attack. Due to the extremely limited public documentation and recent emergence timeframe, detailed information about their attack methodology, tools, encryption techniques, or operational structure remains unavailable from established threat intelligence sources such as CISA, FBI, or major security research firms. No notable high-profile campaigns, significant ransoms, or law enforcement actions have been publicly documented against this group. Given the recent April 2026 first observation date and lack of comprehensive threat intelligence reporting, the current operational status and capabilities of Blackwater remain largely unknown to the broader cybersecurity community. The group has been linked to 6 public disclosures across our corpus. First observed on a leak site on April 12, 2026; most recent post May 2, 2026. The operation is currently active.

Timeline of this disclosure

April 12, 2026medical-park listed by blackwateron the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 1,779 disclosures indexed across all operators we track. Geographically, medical-park is reported in TR, a country with 27 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

Medical Park Hastaneler Grubu

listed as medical-park · Claimed by blackwater · listed 1 month ago

38d

Age

since listed · data leaked

Status timeline

Listed
Apr 12, 2026
Data leaked

At a glance

Group: blackwater
Status: Data leaked
Country: TR
Sector: Healthcare
Listed on leak site: Apr 12, 2026

About the victim

AI dossier — public-source company profile

Medical Park Hastaneler Grubu is Turkey's largest private hospital group, operating 36 hospitals across 14 provinces in Turkey. The group employs approximately 14,000 staff and provides a wide range of medical services to patients nationwide.

Industry: Hospital & Healthcare Group
Employees: 14000

Attack summary

Severity: critical — The victim is a major healthcare provider with 14,000 employees and 36 hospitals; the disclosure status is 'data_published', indicating confirmed exfiltration of data that almost certainly includes regulated patient PII and medical records at significant scale.

The Blackwater ransomware group claims to have attacked Medical Park Hastaneler Grubu and has published data, indicating confirmed exfiltration; the exact nature of the exfiltrated data and whether encryption occurred is not detailed in the post.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Patient records (inferred)
Hospital operational data (inferred)
Employee records (inferred)

What the group claims

Medical Park Hastaneler Grubu is Turkey's leading healthcare group, operating 36 hospitals across 14 provinces with a workforce of 14,000 employees. They offer a wide range of medical services.

The leak post

captured from the group's site

Blog BLACKWATER Compass Housing Alliance Publicated at 2026-04-30 09:22:58 Compass Housing Alliance is dedicated to developing and providing essential services, shelter, and affordable housing to ensure that everyone in the community has a safe place to call home. See more Shenzhen Gongjin Electronics Publicated at 2026-04-29 11:29:44 confidential information, developments, reports and all internal company data : http://ucfhnoihzgx4wz4beyzfxnh46cs37r4zbq627xyctykpatruvmghbyqd.onion/s/e292180d38d92fe2/ See more Grupo EBD Publicated at 2026-04-17 23:05:20 data download link http://ucfhnoihzgx4wz4beyzfxnh46cs37r4zbq627xyctykpatruvmghbyqd.onion/s/95f46e8106995901/ See more Minidoka Memorial Hospital Publicated at 2026-04-17 21:50:22 Data will be published after 7 days. See more medical-park Publicated at 2026-03-20 10:20:42 all internal and confidential company data and data of all clients: http://ucfhnoihzgx4wz4beyzfxnh46cs37r4zbq627xyctykpatruvmghbyqd.onion/s/6faa99933c9fef57/ See more

Sources

Leak posthttp://ejzl7cjxmkx7lzhiqwidmrwtfjv45pkczbc4fnyaut3t7gll3yaiq5id.onion/blog?uuid=500eaba7-8a1c-3f42-a247-4be113b72b6e

Source

Indexed 1 month 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.