Social EngineeringHealthcareHealthcarePhishingDelayed DiscoveryIdentity (basic)LowContained

McKenzie County Healthcare System, Inc.

bd_47a2ebba1576c394 · schema v1 · pii pii-v1

Severity

Low

Discovered

Oct 5, 2023

Filed

Apr 10, 2024

To disclose

27 weeks

Affected

Not disclosed

Linked

2 filings

Confidence

66%

Full breach record for McKenzie County Healthcare System, Inc. →2 incidents on file

McKenzie County Healthcare Systems, Inc. notified consumers on April 10, 2024, of a breach affecting employee email accounts accessed between Oct 2-4, 2023. The incident likely involved phishing. Affected data includes names. The company offered credit monitoring and is reviewing security policies. No specific victim count was disclosed in the filing.

J jump to incidentP pin to compareR raw source

Vermont clock✗ VT AG >45 bday27 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 3 days

discovery → filing · 27 weeks / 188 days

Oct 2, 2023

Begins

Oct 5, 2023

Discovered

Apr 10, 2024

Filed

vs. sector median

+14 wks slower

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

New Hampshire State AGbd_f4e88d007ea9a5b12024-04-10Verified

Name: McKenzie County Healthcare System, Inc.
norm: mckenzie county healthcare system

Name: McKenzie County Healthcare System, Inc.
norm: mckenzie county healthcare system
Industry: Healthcarellm

Discovered: Oct 5, 2023
Breach occurred: Oct 2, 2023 – Oct 4, 2023
Undetected for: 3 daysoccurrence → discovery
Materiality determined: Apr 10, 2024
Notification sent: Apr 10, 2024
Affected individuals: Not disclosed
Data types: Identity (basic)
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid Accounts
Threat actor: External
Regulator citations: Filed notice with Vermont Attorney General
Initial access: phishing_link

During the incident: Immediately commenced an investigation to confirm the full nature and scope of the incident
Taking steps to implement additional safeguards
Review policies and procedures relating to data privacy and security
Offering complimentary credit monitoring and identity protection services for ## months through Experian
Changes made: Implementing additional safeguards
Reviewing policies and procedures relating to data privacy and security
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 27 weeks(188 days from discovery to filing)
Compliance flags: VT AG >45 bday
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

New Hampshire State AGApr 10 · first

Vermont State AGApr 10 · first · this page

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://ago.vermont.gov/document/2024-04-10-mckenzie-county-healthcare-systems-data-breach-notice-consumers
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 10, 2024
Raw hash: d653c8b37f729a3cdf0c09e6f5784d359ebecb5b19773831b96126aa5a5c674a

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityMcKenzie County Healthcare System, Inc.

Victim entityMcKenzie County Healthcare System, Inc.

Incidentdiscovered Oct 5, 2023

Stated responseImmediately commenced an investigation to confirm the full nature and scope of the incident

ComplianceVT AG >45 bday

Extraction provenanceno artifact recorded

Source provenanceago.vermont.gov