Was San Jose Country Club hit by ransomware?

San Jose Country Club was listed by the Medusa ransomware operation (United States), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the Medusa ransomware group?

Medusa is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the San Jose Country Club breach?

Medusa published data attributed to San Jose Country Club (~117.5 GB). Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

← All victims

San Jose Country Club

Claimed by Medusa · listed 1 year ago

117.5 GB

Data size

13m

Age

since listed · data leaked

Status timeline

ListedJun 9, 2025
Data leakeddate unknown

At a glance

Group: Medusa
Status: Data leaked
Country: United States
Sector: Hospitality and Tourism
Listed on leak site: Jun 9, 2025
Data size: 117.5 GB

About the victim

AI dossier — public-source company profile

San Jose Country Club is a premier private golf club located in Northern California, established in 1899. The club offers year-round golf, dining, and social activities, with event facilities for weddings and special occasions. It serves golf enthusiasts and families in the Bay Area with an emphasis on exclusive services and dining experiences.

Industry: Private Golf Club & Hospitality
Address: 15571 Alum Rock Ave, San Jose, CA 95127
Founded: 1899

Attack summary

Severity: high — Confirmed exfiltration and publication of 117.5 GB of data from a private club likely containing member PII, financial records, and sensitive operational information affecting an established organization with hundreds of members.

Medusa claims to have exfiltrated 117.5 GB of data from San Jose Country Club. The group has published the data, indicating confirmed exfiltration rather than encryption-only.

high

Data the group says was taken

AI dossier — extracted from the leak post

Member records
Financial data
Personal information
Operational records
Event/booking information

What the group claims

San Jose Country Club is a premier family-friendly private golf club located in Northern California, established in 1899 and known for its rich tradition. The club offers year-round golf, dining options, and various social activities, making it a sought-after destination for members in the Bay Area. It features a newly remodeled clubhouse and event facilities for hosting weddings and special events. Catering to golf enthusiasts and families alike, the club emphasizes superior service and exclusive dining experiences. company is headquartered in 15571 Alum Rock Ave San Jose, CA 95127 The total amount of data leakage is 117.5 GB

Sources

Leak posthttp://xfv4jzckytb4g3ckwemcny3ihv4i5p4lqzdpi624cxisu35my5fwi5qd.onion/detail?id=a5c9215ce9d903912a5f1e168ea16357

Source

Indexed 1 year 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.

Is this your supplier? Your competitor? You?

Pro plans monitor your domain, corporate emails, and crypto wallets across every new ransomware leak-site post, breach dump and Telegram callout — alerts within 5 minutes.

Disclosure context

About Medusa

Medusa, also known as MedusaLocker, is a financially motivated ransomware group that emerged in November 2022 and has since compromised 568 known victims across multiple countries. The group's origin and specific affiliations remain unclear from publicly available intelligence, though their operational patterns suggest they function as an independent ransomware operation rather than a documented Ransomware-as-a-Service model. Medusa primarily targets organizations in the United States, United Kingdom, Canada, Italy, and Australia, with a focus on business services, healthcare, manufacturing, and technology sectors, employing typical ransomware tactics including data encryption and likely exfiltration for double extortion purposes, though specific technical methodologies and initial access vectors have not been extensively documented in public threat intelligence reports. While the group has maintained a relatively high victim count since its emergence, detailed information about specific notable campaigns, high-profile victims, or major ransom demands has not been widely reported by major cybersecurity firms or law enforcement agencies. As of current intelligence assessments, Medusa appears to remain active in the threat landscape, continuing to target organizations across their established geographic and sectoral preferences. The group has been linked to 635 public disclosures across our corpus. First observed on a leak site on November 15, 2022; most recent post May 5, 2026. The operation is currently active.

Also tracked as: MedusaLocker, MEDUSA LOCKER.

Timeline of this disclosure

June 9, 2025San Jose Country Club listed by Medusaon the group's public leak site

Data size: 117.5 GB

Other recent disclosures by Medusa

Medusa has been linked to 635 public victims on Darkfield. A sample of the most recent:

See the full Medusa dossier →

Sector and geography

This disclosure adds to ransomware activity in the Hospitality and Tourism sector, which has 452 disclosures indexed across all operators we track. Geographically, San Jose Country Club is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Medusa means San Jose Country Club 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 Medusa'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.