Social EngineeringHealthcareProfessional ServicesHealthcarePhishingStolen CredentialsTargetedCustomer Data InvolvedIdentity (basic)Government IDFinancial accountFinancial credentialsHealth (basic)PHIMediumContained

Ariel Clinical Services

bd_069261e939a2bfbb · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jul 28, 2025

Filed

Dec 8, 2025

To disclose

19 weeks

Affected

1state residents only

Confidence

65%

Full breach record for Ariel Clinical Services →

Ariel Clinical Services notified Montana residents of a data security incident involving unauthorized access to an employee email account. The incident, detected on July 28, 2025, exposed names, SSNs, financial card numbers, and medical/insurance information. The company engaged cybersecurity specialists, secured accounts, and offered 12 months of credit monitoring.

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Incident timeline

undetected · 3 days

discovery → filing · 19 weeks / 133 days

Jul 25, 2025

Begins

Jul 28, 2025

Discovered

Dec 8, 2025

Filed

vs. sector median

+7 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed1 affectedView incident

Name: Ariel Clinical Services
norm: ariel clinical

Name: Ariel Clinical Services
norm: ariel clinical
Industry: HealthcarellmProfessional Servicesllm

Discovered: Jul 28, 2025
Breach occurred: Jul 25, 2025 – Jul 29, 2025
Undetected for: 3 daysoccurrence → discovery
Materiality determined: —
Notification sent: Dec 5, 2025
Affected individuals: 1state-resident count only
Data types: Identity (basic)Government IDFinancial accountFinancial credentialsHealth (basic)PHI
Data elements: Social Security number
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email Collection
Threat actor: ExternalFinancial
Initial access: phishing_link

During the incident: Secured the account
Engaged cybersecurity specialists to conduct an investigation
Implemented additional measures to enhance the security of our network environment
Providing you with the opportunity to enroll in complimentary credit monitoring and identity protection services
Changes made: Implemented additional measures to enhance the security of our network environment
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 19 weeks(133 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

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/2026/01/Consumer-notification-letter-27.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Dec 8, 2025
Raw hash: ba128f5e8261d4d6097c19077931694020c4f42df6d3b10c82b49d7c36b9f87c

Reporting entityAriel Clinical Services

Victim entityAriel Clinical Services

Incidentdiscovered Jul 28, 2025

Stated responseSecured the account

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov