HackingHealthcareHealthcareData ExfiltratedCustomer Data InvolvedPIIIdentity (basic)LowContained

Cornerstone Healthcare Group Management Services LLC

bd_097148949845f28d · schema v1 · pii pii-v1

Severity

Low

Discovered

Dec 1, 2023

Filed

Jul 8, 2024

To disclose

31 weeks

Affected

4state 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 reported a data breach affecting 4 New Hampshire residents. Suspicious activity was detected in mid-December 2023, with data exfiltration occurring on December 19, 2023. Personal information of residents was impacted. Notices were sent on July 1, 2024, offering credit monitoring services.

J jump to incidentP pin to compareR raw source

Incident timeline

Dec 19, 2023

Begins

Jul 8, 2024

Filed

vs. sector median

+19 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_09280395ee87b7fb2024-07-02 · +6dVerified
Montana State AGbd_200de4f01295e1852024-07-01 · +7dCandidate
Vermont State AGbd_9098338e61d3b15b2024-07-01 · +7dVerified

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 1, 2023
Breach occurred: Dec 19, 2023
Materiality determined: —
Notification sent: Jul 1, 2024
Affected individuals: 4state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1119 Automated Collection
Threat actor: ExternalFinancial

During the incident: Engaged leading cybersecurity firms to assist in assessing the scope of the incident
Notified law enforcement
Sent notices to affected residents via U.S. Mail
Offered credit monitoring and identity protection services through Kroll
Changes made: Offered credit monitoring and identity protection services through Kroll
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 31 weeks(220 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 · 4 states

View merged incident ↗

Montana State AGJul 1 · first

Vermont State AGJul 1 · first

Massachusetts State AG+1d

New Hampshire State AG+7d · this page

Pattern: first filing Jul 1 (MT), last Jul 8 (NH) — a 7-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-20240708.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 8, 2024
Raw hash: e7607eb739a43928108eb9698ca2d00668a1bf2d418dec3a21776cd41b639c56

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 1, 2023

Stated responseEngaged leading cybersecurity firms to assist in assessing the scope of the incident

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov