Ransomware victim disclosure

Hamister Group

Claimed by qilin · listed 5 days ago

Age

since listed · data leaked

Status timeline

Listed
May 26, 2026
Data leaked

At a glance

Group: qilin
Status: Data leaked
Country: RU
Sector: Business Services
Listed on leak site: May 26, 2026

About the victim

AI dossier — public-source company profile

Hamister Group, LLC is a real estate investment and management firm based in Buffalo, NY, with nearly 50 years of experience. The company manages a diverse portfolio of senior living facilities and hotel properties across eight states, with over 2,300 units under management and approximately 1,300 employees. They specialize in acquiring, redeveloping, and managing underperforming assets in high-growth markets.

Industry: Real Estate Investment & Management; Senior Living & Hospitality
Address: 10 Lafayette Square Suite 1900, Buffalo, NY 14203, USA
Employees: 1300+
Founded: 1977

Attack summary

Severity: medium — Status marked 'data_published' suggests exfiltration occurred, but without the actual leak post, proof inventory, or documented data types, severity cannot be elevated. Medium reflects the disclosure status and scale of the organization (1,300+ employees, multi-state operations) while acknowledging the absence of published proof details.

No leak post content provided (marked as 'N/A'). Victim is listed as 'data_published' but no claim details, data types, or proof materials are documented in the available information.

medium

What the group claims

N/A

Sources

Source

Indexed 5 days 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 qilin

Qilin is a ransomware group that emerged in October 2022, operating with primarily financial motivations through targeted attacks against organizations across multiple sectors. The group appears to operate independently with limited public information available regarding their specific country of origin or affiliations to other ransomware families. Qilin employs double extortion tactics, typically exfiltrating sensitive data before deploying their encryption payload, though specific details about their initial access vectors and technical tools remain less documented in public security research. The group has demonstrated a broad targeting approach, with their 1645 known victims spanning multiple countries including the United States, France, Canada, United Kingdom, and Germany, with particular focus on manufacturing, technology, healthcare, and business services sectors. Based on available intelligence reporting, Qilin remains an active threat as of recent assessments, continuing their ransomware operations without significant reported law enforcement disruption. The group has been linked to 1,890 public disclosures across our corpus. First observed on a leak site on October 8, 2022; most recent post May 28, 2026. The operation is currently active.

Timeline of this disclosure

May 26, 2026Hamister Group listed by qilinon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Business Services sector, which has 2,642 disclosures indexed across all operators we track. Geographically, Hamister Group is reported in RU, a country with 25 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.