HackingHealthcareHealthcareData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDPHIHealth (basic)CredentialsMediumActive

Seneca Nation Health System

bd_a2f20bb3ea412802 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Apr 30, 2024

Filed

Sep 6, 2024

To disclose

18 weeks

Affected

1state residents only

Linked

3 filings

Confidence

64%

Full breach record for Seneca Nation Health System →2 incidents on file

Seneca Nation Health System notified Montana AG of a data breach where unauthorized access occurred April 23-30, 2024. Suspicious activity detected April 30, 2024. Exposed data included names, DOBs, SSNs/IDs, PHI, and medical records. Investigation ongoing; law enforcement notified; credit monitoring offered.

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Incident timeline

undetected · 7 days

discovery → filing · 18 weeks / 129 days

Apr 23, 2024

Begins

Apr 30, 2024

Discovered

Sep 6, 2024

Filed

vs. sector median

+7 wks slower

This filing is one of 3 about the same incident.View merged incident

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Siteinc_ransombd_480883f4d89309db2024-05-05 · +124dCandidate

Regulatory filings (1) · sorted by filing gap

HHS OCRbd_a2a46be1176a1b6c2024-09-06Verified

Name: Seneca Nation Health System
norm: seneca nation health system
Domain: senecahealth.org

Name: Seneca Nation Health System
norm: seneca nation health system
Domain: senecahealth.org
Industry: Healthcarellm

Discovered: Apr 30, 2024
Breach occurred: Apr 23, 2024 – Apr 30, 2024
Undetected for: 7 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 1state-resident count only
Data types: Identity (basic)Government IDPHIHealth (basic)Credentials
Data elements: Date of birthMedical information
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: External
Regulator citations: Notified law enforcement

During the incident: Hired third-party experts to address this situation, perform an investigation into the activity, and further secure our systems
Notified law enforcement
Changes made: Offering complimentary membership to Experian’s IdentityWorks
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 18 weeks(129 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

HHS OCRSep 6 · first

Montana State AGSep 6 · first · 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://dojmt.gov/wp-content/uploads/OCP/Consumer-notification-letter-1663.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 6, 2024
Raw hash: 0c6c696b7b05062459788be23337667c3e0c3b68c7595dff30d480458524830d

Linked disclosures

Ransomware claims (1)

Regulatory filings (1) · sorted by filing gap

Reporting entitySeneca Nation Health System

Victim entitySeneca Nation Health System

Incidentdiscovered Apr 30, 2024

Stated responseHired third-party experts to address this situation, perform an investigation into the activity, and further secure our systems

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov