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Cardiovascular Medical Group of Southern California (CVMG)

Claimed by Sinobi · listed 6 months ago

6m
Age
since listed · data leaked

Status timeline

  1. ListedJan 11, 2026
  2. Data leakeddate unknown

At a glance

Group
Sinobi
Status
Data leaked
Country
United States
Sector
Healthcare
Listed on leak site
Jan 11, 2026

About the victim

AI dossier — public-source company profile

Cardiovascular Medical Group of Southern California (CVMG) is a cardiology and internal medicine practice based in Southern California, United States. The group provides comprehensive cardiovascular services including diagnostic testing, disease management, and advanced treatments for patients of all ages. Their board-certified physicians specialize in cardiology and internal medicine, and the practice offers virtual services such as electronic appointment requests and access to test results.

Industry
Cardiovascular & Internal Medicine Healthcare

Attack summary

Severity: critical — The victim is a cardiovascular medical group in the healthcare sector with a 'data_published' status, strongly implying exfiltration and public release of regulated medical and patient PII data (likely HIPAA-covered), which constitutes a critical-severity disclosure of sensitive health information.

The ransomware group Sinobi has listed CVMG with a 'data_published' status, indicating that data has been exfiltrated and published. Given the healthcare sector context, patient and clinical records are likely at stake, though the leak post does not specify the volume or exact nature of the data disclosed.

critical

Data the group says was taken

AI dossier — extracted from the leak post
  • Patient medical records
  • Diagnostic test results
  • Appointment and scheduling data
  • Physician and staff information
  • Patient personal identifiable information (PII)

What the group claims

Cardiovascular Medical Group of Southern California provides a comprehensive range of cardiovascular services, including diagnostic testing, disease management, and advanced treatments for patients of all ages. Their board-certified physicians specialize in cardiology and internal medicine, ensuring expert care and a focus on preventing heart disease. The clinic leverages the latest medical technologies to support patient health and offers accessible virtual services such as electronic appointment requests and test results. Their commitment to personalized care is evident in their strong physician-patient relationships and partnerships with renowned medical institutions.

Sources

Source

Indexed 6 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 sinobi

Based on the limited publicly available information, Sinobi appears to be a recently emerged ransomware operation first observed in July 2025, with financial motivations evidenced by their targeting of 268 victims across multiple sectors. The group's origin and specific affiliations remain undocumented in public threat intelligence reporting, and there is no confirmed information regarding whether they operate as a Ransomware-as-a-Service model or as an independent entity. Their attack methodology and technical capabilities have not been extensively documented by major security research organizations, though their targeting patterns suggest a broad opportunistic approach rather than highly selective operations. The group demonstrates a preference for targeting organizations in the United States, India, United Kingdom, Canada, and Italy, with a focus on manufacturing, healthcare, construction, and technology sectors, suggesting they may exploit common vulnerabilities across these industries rather than deploying sophisticated, sector-specific attack vectors. No major high-profile campaigns or significant law enforcement actions against Sinobi have been publicly reported by CISA, FBI, or established threat intelligence firms. Given the recent emergence timeline and lack of extensive public documentation, the group's current operational status and long-term trajectory remain unclear, though the substantial victim count suggests continued activity as of the last available reporting period. The group has been linked to 274 public disclosures across our corpus. First observed on a leak site on July 5, 2025; most recent post May 8, 2026. The operation is currently active.

Timeline of this disclosure

  • January 11, 2026Cardiovascular Medical Group of Southern California (CVMG) listed by sinobion the group's public leak site

Other recent disclosures by sinobi

sinobi has been linked to 274 public victims on Darkfield. A sample of the most recent:

See the full sinobi 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, Cardiovascular Medical Group of Southern California (CVMG) is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by sinobi means Cardiovascular Medical Group of Southern California (CVMG) 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, CISA (United States), as required for your jurisdiction.
  • Monitor for the data appearing on sinobi'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.