HackingHealthcareTechnologyHealthcareStolen CredentialsCapture Stored DataSupply Chain (3P Vendor)Customer Data InvolvedData ExfiltratedPIIIdentity (basic)Health (basic)PHILowContained

Quantum Group

bd_67cd98f79e9eb691 · schema v1 · pii pii-v1

Severity

Low

Discovered

Dec 28, 2021

Filed

Mar 7, 2022

To disclose

10 weeks

Affected

3state residents only

Confidence

66%

Highmark Health notified Montana residents of a data breach involving Quantum Group, a third-party vendor. Unauthorized access occurred between August 17 and October 11, 2021. Affected data included names, member IDs, DOBs, and prescription info. Highmark provided 12 months of identity monitoring.

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Incident timeline

undetected · 133 days

discovery → filing · 10 weeks / 69 days

Aug 17, 2021

Begins

Dec 28, 2021

Discovered

Mar 7, 2022

Filed

vs. sector median

2 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed3 affectedView incident

Name: Highmark Health
norm: highmark health

Name: Quantum Group
norm: quantum group
Industry: HealthcarellmTechnologyllm

Discovered: Dec 28, 2021
Breach occurred: Aug 17, 2021 – Oct 11, 2021
Undetected for: 133 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 3state-resident count only
Data types: PIIIdentity (basic)Health (basic)PHI
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: ExternalFinancial
Regulator citations: Matter was reported to law enforcement
Initial access: valid_credentials

During the incident: Secured the compromised system
Completed a global password reset
Blocked all remote activity to their network
Rebuilt the compromised server
Deployed an endpoint detection and response program
Reported the matter to law enforcement
Requested Webb Mason discontinue using Quantum as a supplier
Changes made: Reinforced existing security protocols and processes
Deployed an endpoint detection and response program that provides enhanced network protection and monitoring
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 10 weeks(69 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/OCP/Consumer-Notification-Letter-243.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 7, 2022
Raw hash: 9f0884f648002520b842c463566b84d842a59ac62edeacc8f536427e916a3f54

Reporting entityHighmark Health

Victim entityQuantum Group

Incidentdiscovered Dec 28, 2021

Stated responseSecured the compromised system

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov