Social EngineeringHealthcareHealthcarePhishingStolen CredentialsData ExfiltratedCustomer Data InvolvedEmploymentFinancial accountHealth (basic)Identity (basic)Government IDPHIMediumContained

Montana Health Solutions

bd_4457d4f238e51c9b · schema v1 · pii pii-v1

Severity

Medium

Discovered

Sep 17, 2024

Filed

Mar 31, 2025

To disclose

28 weeks

Affected

619state residents only

Linked

4 filings

Confidence

69%

Full breach record for Montana Health Solutions →2 incidents on file

Montana Health Solutions notified the Washington AG that a phishing attack on an employee email account on September 17, 2024, exposed PII, SSNs, driver's licenses, financial data, and PHI for 619 Washington residents. Notices were sent March 19, 2025. Remediation included system safeguards and 12 months of Experian identity protection.

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Washington clock✗ WA AG >90d28 weeks discovery → filing

⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 11 days

discovery → filing · 28 weeks / 195 days

Sep 6, 2024

Begins

Sep 17, 2024

Discovered

Mar 31, 2025

Filed

vs. sector median

+17 wks slower

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

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

Massachusetts State AGbd_1d05605e93872b112025-03-31Verified
Montana State AGbd_22c923595b49da632025-03-28 · +3dCandidate
Indiana State AGbd_e55b2edbe416bfd32025-03-25 · +6dVerified

Name: Constangy, Brooks, Smith & Prophete, LLP
norm: constangy brooks smith prophete

Name: Montana Health Solutions
norm: montana health
Industry: Healthcarellm

Discovered: Sep 17, 2024
Breach occurred: Sep 6, 2024 – Sep 17, 2024
Undetected for: 11 daysoccurrence → discovery
Materiality determined: —
Notification sent: Mar 19, 2025
Affected individuals: 619state-resident count only
Data types: Identity (basic)Government IDFinancial accountHealth (basic)Employment
Data elements: NameSocial Security numberDriver's licence numberFinancial account numberDate of birthHealth insurance IDMedical information
WA-stated cause: Cyberattack
WA-stated duration: lifecycle 1-99dexposure 1-99d
WA-stated discovery: Found while ongoingContained same day
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email Collection
Threat actor: ExternalFinancial
Regulator citations: Notified Washington Attorney General
Initial access: phishing_link

During the incident: Took steps to secure its systems
Launched an investigation
Established a toll-free call center through Epiq
Providing notified individuals with free Experian identity protection services
Changes made: Implemented additional safeguards to enhance the security of its systems
Performed a thorough review of our systems
Implemented additional security measures to protect our digital environment
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 28 weeks(195 days from discovery to filing)
Compliance flags: WA AG >90d
Discovery-date grounding: AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

Indiana State AGMar 25 · first

Montana State AG+3d

Massachusetts State AG+6d

Washington State AG+6d · this page

Pattern: first filing Mar 25 (IN), last Mar 31 (WA) — a 6-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://agportal-s3bucket.s3.amazonaws.com/databreach/BreachA32884.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 31, 2025
Raw hash: 206451c66e9b5a6d35fe030f0c92ffc339410391b6f417c53ae7436f080de18a

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityConstangy, Brooks, Smith & Prophete, LLP

Victim entityMontana Health Solutions

Incidentdiscovered Sep 17, 2024

Stated responseTook steps to secure its systems

ComplianceWA AG >90d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com