MalwareHealthcareHealthcareRansomwareData EncryptedCustomer Data InvolvedDelayed DiscoveryPHIGovernment IDIdentity (basic)Health (basic)HighContained

Minidoka Memorial Hospital

bd_d9a2470613804a20 · schema v1 · pii pii-v2

Severity

High

Discovered

Apr 7, 2026

Filed

Sep 28, 2026

To disclose

25 weeks

Affected

21,931state residents only

Linked

5 records

Confidence

68%

Full breach record for Minidoka Memorial Hospital →

Minidoka Memorial Hospital reported a ransomware incident detected on April 7, 2026. The hospital took systems offline and engaged cybersecurity experts. A review determined that personal information, including names, addresses, Social Security numbers, and medical information, may have been compromised for 21,931 Idaho residents. Notification letters were sent on September 24, 2026. The hospital implemented stricter multi-factor authentication and offered credit monitoring.

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Leak gap clock⏱ Leak >90d25 weeks discovery → filing

Incident timeline

discovery → filing · 25 weeks / 174 days

Apr 7, 2026

Discovered

Sep 28, 2026

Filed

vs. sector median

+16 wks slower

This filing is one of 5 records about the same incident.View merged incident

A leak claim by blackwater about this victim was first seen 149 days before this filing.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Siteblackwaterbd_7914236fd4e929012026-04-17 · +163dCandidate

Regulatory filings (2) · sorted by filing gap

Idaho State AGbd_94e26b58eee9cff42026-08-06 · +53dVerified by operator
HHS OCRbd_7052fc83528b1ee52026-06-04 · +116dCandidate

Press reports (1)

Pressblackwaterbd_8a05174cddeb6c682026-04-05 · +176dCandidate

Name: Minidoka Memorial Hospital
norm: minidoka memorial hospital
Domain: minidokamemorial.org

Name: Minidoka Memorial Hospital
norm: minidoka memorial hospital
Domain: minidokamemorial.org
Industry: Healthcarellm

Discovered: Apr 7, 2026
Materiality determined: —
Notification sent: Sep 24, 2026
Affected individuals: 21,931state-resident count only
Data types: PHIGovernment IDIdentity (basic)Health (basic)
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for Impact
Threat actor: ExternalFinancial
Regulator citations: Submitted supplemental report to Attorney General’s Office

During the incident: Proactively taking systems offline to contain the issue
Engaged industry leading outside cybersecurity experts to assist with securing the network environment and investigating the extent of unauthorized activity
Engaged a data mining vendor to determine the specific impacted population
Opting to notify all patients contained within its EMR database and subsequently complete substitute notification for the remainder of the potentially impacted individuals
Changes made: Changed passwords
Strengthened password requirements
Implemented stricter multi-factor authentication requirements
Offering 12 months of complimentary credit monitoring and identity theft protection through CyberScout
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 25 weeks(174 days from discovery to filing)
Compliance flags: Leak >90d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings

View merged incident ↗

HHS OCRJun 4 · first

Idaho State AG+63d

Idaho State AG+116d · this page

Pattern: first filing Jun 4 (ID), last Sep 28 (ID) — a 116-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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.ag.idaho.gov/content/uploads/2026/09/2026-09-25-Minidoka-Memorial-Hospital.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 28, 2026
Raw hash: ca75a01041b587a52aa5381b705d6895e08a13a795a4997805ce7f33678d8401

Linked disclosures

Ransomware claims (1)

Regulatory filings (2) · sorted by filing gap

Press reports (1)

Reporting entityMinidoka Memorial Hospital

Victim entityMinidoka Memorial Hospital

Incidentdiscovered Apr 7, 2026

Stated responseProactively taking systems offline to contain the issue

ComplianceLeak >90d

Extraction provenanceno artifact recorded

Source provenancewww.ag.idaho.gov