Was Centre Ophtalmologique dErmont hit by ransomware?

Centre Ophtalmologique dErmont was listed by the thegentlemen ransomware operation (France), 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 thegentlemen ransomware group?

thegentlemen 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 Centre Ophtalmologique dErmont breach?

thegentlemen published data attributed to Centre Ophtalmologique dErmont. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Centre Ophtalmologique d'Ermont

listed as Centre Ophtalmologique dErmont · Claimed by Thegentlemen · listed 2 days ago

Age

since listed · data leaked

Status timeline

ListedJul 1, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: France
Sector: Healthcare
Listed on leak site: Jul 1, 2026

About the victim

AI dossier — public-source company profile

Centre Ophtalmologique d'Ermont is a specialized medical clinic in France providing comprehensive ophthalmology services, including routine consultations, advanced diagnostics, and surgical treatments for ocular conditions. The facility operates a patient portal for health information access and appointment management.

Industry: Healthcare — Ophthalmology

Attack summary

Severity: high — Confirmed data publication involving a healthcare provider with patient health records and personal information exposure. Healthcare data is regulated (GDPR, sensitive medical information) and poses direct harm risk to patients.

The threat actor claims to have compromised the clinic's systems and accessed patient health information. The group has published data without stating specific exfiltration details or operational disruption.

high

Data the group says was taken

AI dossier — extracted from the leak post

patient health records
appointment information
personal identifiers

What the group claims

***.com Centre Ophtalmologique d'Ermont, a specialized medical clinic in France dedicated to comprehensive eye care. The facility provides a full spectrum of ophthalmology services, including routine consultations, advanced diagnostics, and surgical treatments for various ocular conditions. The portal serves as a convenient hub where patients can access health information, manage their appointments, and connect with a team of expert specialists

Sources

Victim siteophtalmologie-ermont.com

Source

Indexed 2 days 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 thegentlemen

thegentlemen is a ransomware group that emerged in September 2025, operating with apparent financial motivations based on their broad targeting of commercial sectors. The group has documented 267 victims across multiple countries, with primary focus on the United States, Thailand, France, Brazil, and India. Their targeting strategy demonstrates a preference for high-value sectors including manufacturing, technology, healthcare, and financial services organizations. Given the group's recent emergence and limited public documentation from established threat intelligence sources such as CISA, FBI, or major security research firms, specific details regarding their country of origin, operational structure, attack methodologies, encryption techniques, and whether they employ ransomware-as-a-service models remain unclear. The relatively high victim count of 267 in a short operational timeframe since September 2025 suggests either an aggressive campaign pace or potential inflation of victim numbers through affiliate operations, though without corroborating intelligence reports, the group's exact operational capabilities and notable campaigns cannot be definitively established. Current intelligence indicates the group remains active as of late 2025, though comprehensive threat profiling requires additional validated reporting from authoritative cybersecurity sources. The group has been linked to 559 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post July 1, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

July 1, 2026Centre Ophtalmologique dErmont listed by thegentlemenon the group's public leak site

Other recent disclosures by thegentlemen

thegentlemen has been linked to 559 public victims on Darkfield. A sample of the most recent:

See the full thegentlemen dossier →

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 2,594 disclosures indexed across all operators we track. Geographically, Centre Ophtalmologique dErmont is reported in France, a country with 240 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means Centre Ophtalmologique dErmont 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, CERT-FR (France), as required for your jurisdiction.
Monitor for the data appearing on thegentlemen'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.