Was MUST Informatique hit by ransomware?

MUST Informatique was listed by the thegentlemen ransomware operation (Switzerland), 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 MUST Informatique breach?

thegentlemen published data attributed to MUST Informatique. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Orisha Socialcare (formerly MUST Informatique)

listed as MUST Informatique · Claimed by Thegentlemen · listed 4 months ago

$10M

Ransom

demanded

Age

since listed · data leaked

Status timeline

ListedFeb 24, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: Switzerland
Sector: Technology
Listed on leak site: Feb 24, 2026
Ransom demanded: $10M

About the victim

AI dossier — public-source company profile

MUST Informatique, now operating under the Orisha Socialcare brand, develops and markets software solutions for the French medico-social sector, including home-care providers (PSAD/PSDM), elderly care facilities (EHPAD), disability services, and child protection organisations. Their product suite (MUST G5 Cloud, MUST Q2, NETSoins, NETVie, etc.) handles patient/resident records, care planning, SESAM-Vitale billing, and financial management for healthcare and social-care operators. The company appears to be France-based despite the Switzerland country tag on the leak listing.

Industry: Medical & Social Care Software (ESMS / PSAD / EHPAD)

Attack summary

Severity: critical — The company provides core software to healthcare and social-care operators handling highly sensitive regulated data (medical records, personal data of elderly, disabled persons, and children). A confirmed data_published status with a $10M ransom demand implies large-scale exfiltration of health and PII data belonging to vulnerable populations, which constitutes a critical-severity disclosure under GDPR and healthcare data-protection frameworks.

The ransomware group 'thegentlemen' claims to have attacked MUST Informatique and has moved to a 'data_published' status, indicating exfiltration and publication of stolen data; the group demands $10 million in ransom. The leak post content was not accessible due to bot-protection, so specific data categories published cannot be confirmed from the post itself.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Patient/resident health records (dossiers usagers informatisés)
Care planning and scheduling data
SESAM-Vitale billing and insurance data
Financial and invoicing records
Admission and intake records
Client healthcare provider data
Potentially sensitive personal data of vulnerable individuals (elderly, disabled, children)

What the group claims

mustinformatique.com MUST INFORMATIQUE is a French software publisher founded in 1990 and based in Couzeix, France . The company specializes in creating digital solutions for Home Healthcare Providers (PSAD), focusing on areas like home care, respiratory assistance, orthopedics, and infusion therapy . For nearly 31 years, it has been a key player in its sector, offering software that helps manage patient data, ensure regulatory compliance, and digitize organizational processes for healthcare professionals . In 2024, the company, which generates around €10 million in annual revenue, was acquired by Orisha, a European software publisher, to create a comprehensive digital ecosystem for the home healthcare industry .

The leak post

captured from the group's site

Gentlecloud Protection 🛡️ Gentlecloud Verifying your browser... Initializing security checks... I'm not a bot

Sources

Victim sitemustinformatique.com
Leak posthttp://tezwsse5czllksjb7cwp65rvnk4oobmzti2znn42i43bjdfd2prqqkad.onion

Source

Indexed 4 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 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 483 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post June 11, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

February 24, 2026MUST Informatique listed by thegentlemenon the group's public leak site

Ransom demanded: $10M

Other recent disclosures by thegentlemen

thegentlemen has been linked to 483 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 Technology sector, which has 2,526 disclosures indexed across all operators we track. Geographically, MUST Informatique is reported in Switzerland, a country with 78 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means MUST Informatique 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.
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.