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SIA Medical

listed as Unknown Healthcare Organization · Claimed by Rhysida · listed 2 hours ago

3.28 TB
Data size
9,056,196 files; 160,870 patients; ~600 employees; 2,945 payroll entries records
Today
Age
since listed · listed for ransom

Status timeline

  1. ListedAug 28, 2026

Current state: Listed for ransom

At a glance

Group
Rhysida
Status
Listed for ransom
Sector
Healthcare
Listed on leak site
Aug 28, 2026
Data size
3.28 TB
Records
9,056,196 files; 160,870 patients; ~600 employees; 2,945 payroll entries

About the victim

AI dossier — public-source company profile

SIA Medical is a multi-clinic healthcare provider established in 1993 by Dr Martin Sia, operating 9 clinics across the northwest Melbourne region. The organization provides general medical services to approximately 160,870 patients and employs around 600 staff members.

Industry
Medical & Dental Healthcare Services
Address
Multiple locations: Box Hill, Burwood, Croydon, Essendon, Footscray, Moonee Ponds, Montrose, Mulgrave and Berwick, Melbourne, Victoria, Australia
Employees
600
Founded
1993

Attack summary

Severity: critical — Confirmed exfiltration of large-scale regulated healthcare data including 160,870+ patient medical records with highly sensitive information (HIV status, psychiatric records, pregnancy data), SSNs, Medicare numbers, employee PII at scale, plaintext clinical system credentials, and financial data. This represents a severe breach of Australian healthcare privacy regulations and exposes vulnerable populations.

Rhysida claims to have exfiltrated 3.28 TB of data from SIA Medical, including approximately 160,870 patient medical records with sensitive health information, 600 employee records with personally identifiable information, SQL database backups, and plaintext credentials for clinical systems. The group states they are selling the data to a single buyer within a 7-day window.

critical

Data the group says was taken

AI dossier — extracted from the leak post
  • ~160,870 patient medical records (names, dates of birth, diagnoses including HIV/psychiatry/pregnancy)
  • Medicare numbers
  • ~7.6 million patient documents
  • Clinical notes and full patient dossiers
  • ~600 employee records (names, SSNs, salaries, bank accounts)
  • Staff identity documents (passports, driver's licenses, police checks, tax file declarations)
  • Plaintext clinical system credentials (Synapse imaging, PRODA, terminal server)
  • HR records (employment contracts, incident reports, immunisation registers)
  • CEO emails (204,257 files)
  • Insurance and work-cover files
  • 1.08 TB of SQL backups
  • Payroll records (2,945 entries)

What the group claims

Large healthcare organization with over 160,000 patients and approximately 600 employees. Data includes sensitive medical records covering HIV, psychiatry, and pregnancy.

The leak post

captured from the group's site
SIA Medical was established in 1993 and was founded by Dr Martin Sia in Melbourne's northwest. 9 clinics - Box Hill, Burwood, Croydon, Essendon, Footscray, Moonee Ponds, Montrose, Mulgrave and Berwick.**We are pleased to present:** ~20,000 patient medical records - names, dates of birth, Medicare numbers, clinical notes, insurance and work-cover files, full patient dossiersStaff identity documents - passports, driver's licenses, police checks, tax file declarations of doctors and employeesPlaintext credentials - logins and passwords for clinical systems (Synapse imaging, PRODA, terminal server, doctor accounts)HR records - signed employment contracts, staff incident reports, immunisation registersLegal & financial - subpoenas, complaints, Bupa contracts, bank details (BSB/ABN), provider payment forms
With just 7 days on the clock, seize the opportunity to bid on exclusive, unique, and impressive data. Open your wallets and be ready to buy exclusive data. We sell only to one hand, no reselling, you will be the only owner!
CRI Electric is a veteran-owned business based in San Antonio, providing professional electrical services since 1998. They cater to both residential and commercial…

Data the group says was taken

  • patient medical records
  • SSNs
  • addresses
  • diagnoses
  • HIV records
  • psychiatry records
  • pregnancy records
  • employee salary records
  • bank accounts
  • termination records
  • SQL backups
  • patient documents
  • CEO emails
  • payroll entries

Screenshot of the leak post

Leak screenshot for Unknown Healthcare Organization

Sources

Source

Indexed 2 hours 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 Rhysida

Rhysida is a ransomware group that emerged in June 2023, operating with primarily financial motivations through targeted attacks against critical infrastructure and public sector organizations. The group's origin and potential state affiliations remain unclear, though they operate independently rather than as a traditional Ransomware-as-a-Service model, with limited public documentation regarding connections to other cybercriminal organizations. Rhysida employs double extortion tactics, typically gaining initial access through compromised VPN credentials and exploiting vulnerable public-facing applications before deploying their ransomware payload and exfiltrating sensitive data prior to encryption. The group has demonstrated a particular focus on healthcare and educational institutions, with notable attacks documented by CISA and FBI advisories highlighting their targeting of hospitals and school districts across multiple countries, resulting in significant operational disruptions to critical services. As of late 2024, Rhysida remains an active threat with continued operations targeting organizations primarily in the United States, Canada, and other Western nations, maintaining their focus on high-value sectors where operational disruption can maximize ransom payment likelihood. The group has been linked to 296 public disclosures across our corpus. First observed on a leak site on June 5, 2023; most recent post August 28, 2026. The operation is currently active.

Timeline of this disclosure

  • August 28, 2026Unknown Healthcare Organization listed by Rhysidaon the group's public leak site
Data size
3.28 TB
Records
9,056,196 files; 160,870 patients; ~600 employees; 2,945 payroll entries

Other recent disclosures by Rhysida

Rhysida has been linked to 296 public victims on Darkfield. A sample of the most recent:

See the full Rhysida dossier →

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 2,608 disclosures indexed across all operators we track.

If your organisation is affected

A listing by Rhysida means Unknown Healthcare Organization appeared on a ransomware extortion site and is being pressured to pay before any publication. 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.
  • Monitor for the data appearing on Rhysida'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.