HackingHealthcareHealthcareStolen CredentialsCustomer Data InvolvedData ExfiltratedPIIIdentity (basic)LowContained

Cornerstone Healthcare Group Management Services LLC

bd_3ea79518fc5ab9ad · schema v1 · pii pii-v1

Severity

Low

Discovered

Dec 15, 2023

Filed

Nov 4, 2024

To disclose

46 weeks

Affected

24state residents only

Linked

4 filings

Confidence

65%

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

Cornerstone Healthcare Group Management Services LLC reported a supplemental data breach affecting 24 New Hampshire residents. The breach occurred on December 19, 2023, following suspicious network activity detected in mid-December 2023. Personal information was compromised. The company engaged cybersecurity firms and law enforcement, and offered credit monitoring services.

J jump to incidentP pin to compareR raw source

Incident timeline

Dec 19, 2023

Begins

May 30, 2024

Scope determined

Nov 4, 2024

Filed

vs. sector median

+34 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_5291e3d7b8c066a02024-11-06 · +2dVerified
California State AGbd_88a92967dc0456b42024-11-02 · +2dCandidate
Vermont State AGbd_28201747796ff0062024-11-01 · +3dVerified

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: Healthcarellm

Discovered: Dec 15, 2023
Breach occurred: Dec 19, 2023
Materiality determined: May 30, 2024
Notification sent: Jul 1, 2024
Affected individuals: 24state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: Notified Office of the Attorney General
Initial access: valid_credentials

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
Changes made: Containing the issue
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 46 weeks(325 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 · this page

New Hampshire State AG+5d

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-group-management-20241104.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 4, 2024
Raw hash: 00a434234f90685851a1b27c13fadf6fd81b4fa466dc1dff91ba3ecf01f87a2b

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityCornerstone Healthcare Group Management Services LLC

Victim entityCornerstone Healthcare Group Management Services LLC

Incidentdiscovered Dec 15, 2023

Stated responseContacted law enforcement

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov