high severity December 16, 2025 · 3 min read Unverified claim — what this is

Markham Stouffville Hospital Listed by Anubis Ransomware Group

If you were named in this filing, here’s what is being claimed, and what it would mean for you.

Markham Stouffville Hospital was listed on Anubis's leak site. Anubis claims to have stolen internal data. This is the group's claim, not a confirmed finding.

Markham Stouffville Hospital Listed by Anubis Ransomware Group

On December 16, 2025, Markham Stouffville Hospital appeared on the leak site of the Anubis ransomware group after attackers exfiltrated internal files containing personal data.

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What Public Reporting Shows

Public reporting indicates the hospital was listed on the Anubis ransomware leak site that day. The group claims to have stolen internal files during a ransomware attack. Available reporting describes the exposed material as including personal data, though the exact volume and full list of data types remain unclear. No confirmed victim count has been released by the hospital or the attackers. The listing appeared on an onion address tracked by ransomware.live, consistent with how Anubis publishes alleged proof of compromise.

Why This Matters for You and Your Family

When a local hospital suffers a breach, the people most likely to be affected are those who live nearby and have used its services. That includes your medical records, insurance details, home address, phone number, date of birth, and possibly family member information. Personal data from healthcare providers is especially dangerous because it combines identity details with sensitive health history that identity thieves and extortionists can exploit for years. Even if you were not directly notified, the fact that the hospital has not released precise numbers means you cannot assume your information stayed safe.

The Doxxing and Identity-Chain Risks

Stolen hospital records rarely stay isolated. Attackers or buyers frequently combine medical data with credentials from earlier breaches to build detailed profiles. A username or email tied to your hospital account can link to gaming logins, social media, and family accounts. This creates doxxing chains that expose home addresses, children’s names, and daily routines. Credential leaks like this one often cascade into account takeovers precisely because the same password or recovery details appear across work, personal, and gaming services. Protecting gaming accounts — yours or your children’s — becomes critical because those handles frequently serve as the starting point for mapping an entire household’s digital footprint.

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What the free scan actually returns

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Found on people-search siteswe remove these

These listings are live, public, and legal to remove — and removing them is what we do.

value redacted in this sampleage, relatives, address historySpokeo

value redacted in this samplephone, household, property recordsBeenVerified

value redacted in this sample580 companies checked

Found in breach recordsverifiedreported — unverified

Each record is labeled: confirmed breach data, or an attacker’s claim no one has verified.

verifiedvalue redacted in this samplepassword + phone · 2024telecom breach

unverifiedvalue redacted in this sampleclaimed in ransomware listing · 2026leak-site claim

Leaked data cannot be deleted from the internet — anyone claiming otherwise is lying. Broker listings can be removed. We do the second, and show you exactly what to fix from the first.

Report details & sourcing

Attributed to Anubis · 115 incidents tracked →

Severity High the filing does not enumerate what was exposed

Disclosed December 16, 2025

Last reviewed August 8, 2026

Affected Unconfirmed

By GalaxyWarden Threat Research · Editorial & sourcing standards

Unverified claim — what this report is

This page documents a public listing on a ransomware/extortion group’s leak site, tracked via public threat-intelligence sources. A listing is the attacker’s claim. GalaxyWarden aggregates and reports such claims; we have not independently verified that a breach occurred, what data (if any) was taken, or the accuracy of anything the group asserts, and the named organisation has not necessarily confirmed the incident. Sections above describe what the listing shows and the group’s documented history — not verified findings about the named organisation. If you represent this organisation and believe anything here is inaccurate, tell us and we’ll review it promptly.

Editorial & sourcing policy

GalaxyWarden is a breach-monitoring service and news aggregator. We do not exfiltrate, host, purchase, or redistribute stolen data. Breach information is compiled from publicly accessible sources and threat-intelligence platforms, and is reported as claims attributed to their source. We promptly correct or remove material shown to be inaccurate — see our content & takedown policy or write to support@galaxywarden.com.

Threat-actor tracker

Anubis — 115 incidents tracked

Every breach we've attributed to Anubis, in one running log. See who else they've hit →

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