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Markham Stouffville Hospital

Claimed by Anubis · listed 7 months ago

7m
Age
since listed · data leaked

Status timeline

  1. ListedDec 16, 2025
  2. Data leakeddate unknown

At a glance

Group
Anubis
Status
Data leaked
Country
Canada
Sector
Healthcare
Listed on leak site
Dec 16, 2025

About the victim

AI dossier — public-source company profile

Markham Stouffville Hospital (MSH) is a community hospital network in York Region, Ontario, Canada, operating acute care facilities in Markham and Stouffville. It provides a broad range of inpatient, outpatient, and emergency health services to a growing regional population. MSH is affiliated with the University of Toronto and serves hundreds of thousands of patients annually.

Industry
Acute Care Hospital & Healthcare Services
Address
381 Church Street, Markham, Ontario L3P 7P3, Canada
Employees
1000-5000
Founded
1990

Attack summary

Severity: critical — The victim is a Canadian acute care hospital, meaning any exfiltrated data almost certainly includes regulated personal health information (PHI/PII) at scale, which constitutes a critical-severity disclosure under both Canadian PIPEDA/PHIPA and general ransomware severity standards. The data has been published ('data_published' status), confirming exfiltration and public release.

The Anubis ransomware group claims to have exfiltrated data from Markham Stouffville Hospital and has disclosed the data publicly; the leak post references a 'Micaforce Technology Download,' suggesting exfiltrated files have been made available for download.

critical

Data the group says was taken

AI dossier — extracted from the leak post
  • Patient health records
  • Personal identifiable information (PII)
  • Staff/employee records
  • Internal hospital documents
  • Potentially financial/administrative data

What the group claims

Personal data.

The leak post

captured from the group's site
Anubis blog ANUBIS NEWS FAQ ABOUT RULES English English Español Русский 中文 Deutsch Description Micaforce Technology Download

Sources

Source

Indexed 7 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 anubis

Anubis is a recently emerged ransomware group that began operations in February 2025, primarily motivated by financial gain through encryption and extortion attacks. The group has demonstrated rapid expansion, accumulating 65 documented victims within a short operational timeframe. Given the group's recent emergence, limited information is publicly available regarding their specific country of origin, organizational structure, or confirmed affiliations with other cybercriminal entities, though their operational patterns suggest they may operate as an independent group or small-scale ransomware-as-a-service operation. Their attack methodology appears to focus on opportunistic targeting across multiple geographic regions, with victims concentrated primarily in the United States, Australia, Canada, the United Kingdom, and France, indicating either English-language proficiency or the use of automated tools that facilitate cross-border operations. The group demonstrates a clear preference for targeting healthcare organizations and manufacturing companies, followed by business services and technology sectors, suggesting they prioritize organizations with critical operational dependencies that may be more likely to pay ransoms quickly. Due to the group's recent emergence in early 2025, there is insufficient publicly documented information from established cybersecurity firms or law enforcement agencies regarding their specific technical capabilities, encryption methods, or whether they employ double or triple extortion tactics involving data theft and leak sites. As of current reporting, Anubis remains an active threat with continued victim acquisition, though the full scope of their capabilities and long-term operational sustainability remains to be determined as security researchers continue to analyze their activities. The group has been linked to 96 public disclosures across our corpus. First observed on a leak site on February 25, 2025; most recent post July 12, 2026. The operation is currently active.

Timeline of this disclosure

  • December 16, 2025Markham Stouffville Hospital listed by anubison the group's public leak site

Other recent disclosures by anubis

anubis has been linked to 96 public victims on Darkfield. A sample of the most recent:

See the full anubis 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, Markham Stouffville Hospital is reported in Canada, a country with 1,055 ransomware disclosures in our corpus.

If your organisation is affected

A listing by anubis means Markham Stouffville Hospital 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, CCCS (Canada), as required for your jurisdiction.
  • Monitor for the data appearing on anubis'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.