MalwareHealthcareHealthcareRansomwareStolen CredentialsQilinData ExfiltratedData EncryptedCustomer Data InvolvedEmployee Data InvolvedTargetedIdentity (basic)Government IDFinancial accountFinancial credentialsHealth (basic)CredentialsAuthenticationMediumContained

Madera Community Hospital

bd_fcb8c1bfe4fa0256 · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 29, 2025

Filed

Jul 17, 2026

To disclose

13 months

Affected

1state residents only

Linked

4 filings

Confidence

67%

Full breach record for Madera Community Hospital →

Madera Community Hospital reported a ransomware incident involving the Qilin threat actor. The attack occurred May 28-30, 2025, and was detected on May 29, 2025. The incident resulted in the encryption and exfiltration of PHI, PII, and financial data. Notices were mailed on July 15, 2026, to 1 Massachusetts resident and 4 Rhode Island residents. Remediation included MFA, enhanced monitoring, and patching.

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Massachusetts clock✗ MA AG >90d13 months discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 1 days

discovery → filing · 14 months / 414 days

May 28, 2025

Begins

May 29, 2025

Discovered

Jul 17, 2026

Filed

vs. sector median

+48 wks slower

This filing is one of 4 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

Nebraska State AGbd_8351f5b14e0ee8ed2026-07-15 · +2dVerified
California State AGbd_479d88f7af7cf52c2026-07-14 · +3dVerified
HHS OCRbd_dac17ef542507f972026-07-13 · +4dVerified

Name: Madera Community Hospital
norm: madera community hospital
Domain: reopeningmadera.org

Name: Madera Community Hospital
norm: madera community hospital
Domain: reopeningmadera.org
Industry: Healthcarellm

Discovered: May 29, 2025
Breach occurred: May 28, 2025 – May 30, 2025
Undetected for: 1 dayoccurrence → discovery
Materiality determined: —
Notification sent: Jul 15, 2026
Affected individuals: 1state-resident count only
Data types: Identity (basic)Government IDFinancial accountFinancial credentialsHealth (basic)CredentialsAuthentication
Attack vector: Ransomware· Qilin
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 ChannelT1078 Valid Accounts
Threat actor: QilinExternalFinancial
Regulator citations: Notified Massachusetts Office of Consumer Affairs and Business Regulation
Initial access: valid_credentials

During the incident: Engaged outside counsel
Retained cybersecurity experts to conduct a forensic investigation
Received decryption key and worked with a vendor to decrypt and stage files
Engaged a data-mining vendor to assess files' contents
Notified law enforcement
Mailed notices and provided substitute notice to affected individuals
Changes made: Updated incident response plan
Implemented multi-factor authentication for access to critical systems, including electronic health record systems and external email access
Implemented enhanced monitoring and threat-detection capabilities
Strengthened network security controls, including updates to firewall rules, endpoint protection, and system access restrictions
Performed system-wide updates and patching as part of a broader hardening effort
Reinforced employee awareness of cybersecurity risks through enhanced training focused on phishing prevention and appropriate reporting of suspicious activity
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 13 months(398 days from discovery to filing)
Compliance flags: MA AG >90d
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 3 states

View merged incident ↗

HHS OCRJul 13 · first

California State AG+1d

Nebraska State AG+2d

Massachusetts State AG+4d · this page

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://www.mass.gov/doc/2026-1175-madera-community-hospital/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 17, 2026
Raw hash: d84cdcf8cf5a2351292666ba362ac1110265301069e37193453aea67a34412bb

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityMadera Community Hospital

Victim entityMadera Community Hospital

Incidentdiscovered May 29, 2025

Stated responseEngaged outside counsel

ComplianceMA AG >90d

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov