Disclosure context

About Qilin

Qilin is a ransomware group that emerged in October 2022, operating with primarily financial motivations through targeted attacks against organizations across multiple sectors. The group appears to operate independently with limited public information available regarding their specific country of origin or affiliations to other ransomware families. Qilin employs double extortion tactics, typically exfiltrating sensitive data before deploying their encryption payload, though specific details about their initial access vectors and technical tools remain less documented in public security research. The group has demonstrated a broad targeting approach, with their 1645 known victims spanning multiple countries including the United States, France, Canada, United Kingdom, and Germany, with particular focus on manufacturing, technology, healthcare, and business services sectors. Based on available intelligence reporting, Qilin remains an active threat as of recent assessments, continuing their ransomware operations without significant reported law enforcement disruption. The group has been linked to 1,858 public disclosures across our corpus. First observed on a leak site on October 8, 2022; most recent post May 21, 2026. The operation is currently active.

Timeline of this disclosure

March 24, 2026Aroostook Mental Health Services listed by Qilinon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 1,779 disclosures indexed across all operators we track. Geographically, Aroostook Mental Health Services is reported in United States, a country with 7,392 ransomware disclosures in our corpus.

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.

Ransomware victim disclosure

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Aroostook Mental Health Services

Claimed by Qilin · listed 2 months ago

57d

Age

since listed · data leaked

Status timeline

Listed
Mar 24, 2026
Data leaked

At a glance

Group: Qilin
Status: Data leaked
Country: United States
Sector: Healthcare
Listed on leak site: Mar 24, 2026

About the victim

AI dossier — public-source company profile

Aroostook Mental Health Services (AMHC) is a nonprofit community mental health center based in Aroostook County, Maine, United States. The organization provides behavioral health, psychiatric, and substance use disorder services to individuals and families across a largely rural region. AMHC operates multiple service locations throughout northern Maine.

Industry: Mental Health & Behavioral Health Services

Attack summary

Severity: critical — The victim is a mental health services provider, meaning exfiltrated data almost certainly contains highly sensitive protected health information (PHI) and mental health records regulated under HIPAA. Data has been marked as published, indicating confirmed exfiltration of regulated, sensitive medical data at scale.

Qilin has listed Aroostook Mental Health Services with a 'data_published' status, indicating the group claims to have exfiltrated data and has published it; however, the specific leak post excerpt provided does not contain details about the volume or nature of data taken from this particular victim.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Patient mental health records
Personally identifiable information (PII)
Protected health information (PHI)
Employee records
Financial records

What the group claims

N/A

The leak post

captured from the group's site

Qilin blog Sorting Created At Name Bluize Software Company url Zoom Info May 13, 2026 0 photos Learn More Mayer Law Firms & Legal Services Company url Zoom Info May 13, 2026 0 photos Learn More Spirit Medical Transport Ambulance Services Company url Zoom Info May 13, 2026 0 photos Learn More Domaine Des Tournels Manufacturing Company url May 13, 2026 0 photos Learn More Johnson Carter Architects Architecture, Engineering & Design Company url Zoom Info May 13, 2026 0 photos Learn More LTJ Industrial Services Industrial Machinery & Equipment Company url Zoom Info May 13, 2026 0 photos Learn More Brand X Hydrovac Services Civil Engineering Construction Company url Zoom Info May 13, 2026 0 photos Learn More John G Yphantides A Professional Law Law Firms & Legal Services Company url Zoom Info May 13, 2026 0 photos Learn More One Legal Law Firms & Legal Services Company url Zoom Info May 13, 2026 0 photos Learn More The Gravity Group Architecture, Engineering & Design Company url Zoom Info May 12, 2026 3 photos Learn More Mediapost Spain Advertising & Marketing Company url Zoom Info May 12, 2026 13 photos Learn More + 6 more AppDirect Software Company url Zoom Info May 11, 2026 0 photos …

Sources

Source

Indexed 2 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.