HackingPHIGovernment IDIdentity (basic)MediumContained

Heart South Cardiovascular Group

bd_c12dc0d5f533ec4e · schema v1 · pii pii-v1

Severity

Medium

Discovered

Nov 11, 2025

Filed

Apr 6, 2026

To disclose

—

Affected

Not disclosed

Linked

5 filings

Confidence

64%

Full breach record for Heart South Cardiovascular Group →4 incidents on file

Heart South Cardiovascular Group, PC notified Nebraska residents of a cybersecurity incident discovered on November 11, 2025, where an unauthorized party claimed to possess patient data. Forensic investigation found no network access or data theft, but a bad actor posted limited data on the dark web. Kroll was engaged to provide complimentary identity monitoring services to affected patients.

J jump to incidentP pin to compareR raw source

Leak gap clock⏱ Leak >90d

Incident timeline

Nov 11, 2025

Discovered

Apr 6, 2026

Filed

This filing is one of 5 about the same incident.View merged incident

A leak claim by rhysida about this victim predates this filing by 146 days.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Siterhysidabd_2028c3f5990168862025-11-10 · +146dVerified by operator

Regulatory filings (3) · sorted by filing gap

HHS OCRbd_75ff5c082c82aced2026-04-06Verified
Maine State AGbd_dc4e83aef803c8912026-04-06Verified
New Hampshire State AGbd_718fd6945d5f19042026-04-13 · +7dVerified

Name: Heart South Cardiovascular Group
norm: heart south cardiovascular
Domain: heartsouthpc.com

Name: Heart South Cardiovascular Group
norm: heart south cardiovascular
Domain: heartsouthpc.com

Discovered: Nov 11, 2025
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: PHIGovernment IDIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid Accounts
Threat actor: ExternalFinancial
Initial access: phishing_link

During the incident: Commenced a prompt and thorough forensic investigation with external cybersecurity professionals
Secured the services of Kroll to provide identity monitoring
Changes made: Notifying all Heart South patients whose protected health information was stored in the locations from which the posted data resided in our network
Source: Quoted from the filing itself, not independently verified.

Compliance flags: Leak >90d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

HHS OCRApr 6 · first

Maine State AGApr 6 · first

Nebraska State AGApr 6 · first · this page

New Hampshire State AG+7d

Pattern: first filing Apr 6 (AL), last Apr 13 (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://nebraska.gov/ago/data-breach/documents/858a70d3-42bc-43d1-8d75-1626b0980232.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 6, 2026
Raw hash: 50ea7d83e49ad4a3fe46ddc15c2581e7e9e957fa8384a874300a746274293e8c

Linked disclosures

Ransomware claims (1)

Regulatory filings (3) · sorted by filing gap

Reporting entityHeart South Cardiovascular Group

Victim entityHeart South Cardiovascular Group

Incidentdiscovered Nov 11, 2025

Stated responseCommenced a prompt and thorough forensic investigation with external cybersecurity professionals

ComplianceLeak >90d

Extraction provenanceno artifact recorded

Source provenancenebraska.gov