HackingHealthcareTechnologyHealthcareCustomer Data InvolvedIdentity (basic)Government IDMediumContained

Cornerstone Healthcare Group Management Services LLC

bd_5291e3d7b8c066a0 · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 30, 2024

Filed

Nov 6, 2024

To disclose

23 weeks

Affected

24state residents only

Linked

4 filings

Confidence

66%

Full breach record for Cornerstone Healthcare Group Management Services LLC →3 incidents on file

Cornerstone Healthcare Group Management Services LLC submitted a supplemental notice to the New Hampshire Attorney General regarding a data breach affecting 24 NH residents. Unauthorized access occurred, leading to the compromise of personal information including names and government IDs. Notifications were sent starting July 1, 2024. The company engaged cybersecurity firms and law enforcement, offering credit monitoring via Kroll.

J jump to incidentP pin to compareR raw source

Incident timeline

discovery → filing · 23 weeks / 160 days

May 30, 2024

Discovered

Nov 6, 2024

Filed

vs. sector median

+10 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

New Hampshire State AGbd_3ea79518fc5ab9ad2024-11-04 · +2dVerified
California State AGbd_88a92967dc0456b42024-11-02 · +4dCandidate
Vermont State AGbd_28201747796ff0062024-11-01 · +5dVerified

Name: Cornerstone Healthcare Group Management Services LLC
norm: cornerstone healthcare group management

Name: Cornerstone Healthcare Group Management Services LLC
norm: cornerstone healthcare group management
Industry: HealthcarellmTechnologyllm

Discovered: May 30, 2024
Materiality determined: —
Notification sent: Jul 1, 2024
Affected individuals: 24state-resident count only
Data types: Identity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: Notified New Hampshire Attorney General's Office on July 2, 2024

During the incident: Contacted law enforcement
Engaged leading cybersecurity firms to assist us in assessing the incident’s scope and cause
Offering identity monitoring services through Kroll for a period of <<Monitoring Term Length (Months)>> months at no cost
Changes made: Containing the issue
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 23 weeks(160 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 3 states

View merged incident ↗

Vermont State AGNov 1 · first

California State AG+1d

New Hampshire State AG+3d

New Hampshire State AG+5d · this page

Pattern: first filing Nov 1 (VT), last Nov 6 (NH) — a 5-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://mm.nh.gov/files/uploads/doj/remote-docs/cornerstone-healthcare-management-20241106.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 6, 2024
Raw hash: 3e19daf02e3b7bff0043fd647a77918229cf995f200b134ca6ad6207db99a2b4

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityCornerstone Healthcare Group Management Services LLC

Victim entityCornerstone Healthcare Group Management Services LLC

Incidentdiscovered May 30, 2024

Stated responseContacted law enforcement

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov