HackingHealthcareHealthcarePhishingStolen CredentialsData ExfiltratedCustomer Data InvolvedEmployee Data InvolvedIdentity (basic)Government IDHealth (basic)Financial accountHighContained

The Mount Kisco Surgery Center LLC

bd_20749848567ed280 · schema v1 · pii pii-v1

Severity

High

Discovered

Nov 3, 2023

Filed

Jun 26, 2024

To disclose

34 weeks

Affected · nationwide

21,07313 in this filing

Linked

5 filings

Confidence

66%

Full breach record for The Mount Kisco Surgery Center LLC →

The Ambulatory Surgery Center of Westchester (ASCW) disclosed a data breach where an employee's email account was compromised via phishing between Oct 23 and Nov 3, 2023. Unauthorized access exposed PHI, SSNs, driver's licenses, and financial data for 21,073 individuals. ASCW engaged forensic investigators, secured the account, and notified affected individuals on June 26, 2024, offering 12 months of identity protection.

J jump to incidentP pin to compareR raw source

Maine clockDiscovered Nov 3, 2023 → Filed with AG Jun 26, 2024236d ⏱ ME AG >30d34 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 · 11 days

discovery → filing · 34 weeks / 236 days

Oct 23, 2023

Begins

Nov 3, 2023

Discovered

Jun 26, 2024

Filed

vs. sector median

+25 wks slower

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

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

Vermont State AGbd_8af3e03d49b068302024-06-26Candidate
Indiana State AGbd_98faef4f7fe7242f2024-06-26Verified
New Hampshire State AGbd_9a8fe933940dea3e2024-06-26Verified
HHS OCRbd_d25e9f87302944172024-06-25 · +1dVerified

Name: Constangy, Brooks, Smith & Prophete, LLP
norm: constangy brooks smith prophete

Name: The Mount Kisco Surgery Center LLC
norm: the mount kisco surgery center
Also named: The Mount Kisco Surgery Center LLCdba oflegal entity
The Ambulatory Surgery Center of Westchesterdba oftrade name
Industry: Healthcarellm

Discovered: Nov 3, 2023
Breach occurred: Oct 23, 2023 – Nov 3, 2023
Undetected for: 11 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 26, 2024
Affected individuals: 21,073state + nationwide
Data types: Identity (basic)Government IDHealth (basic)Financial account
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email Collection
Threat actor: ExternalFinancial
Regulator citations: Notified Maine Attorney General
Initial access: phishing_link

During the incident: Engaged a digital forensics and incident response firm to conduct an investigation
Took steps to secure the account
Undertook a comprehensive review of the potentially affected data
Offering complimentary credit and identity protection monitoring services
Changes made: Implementing additional security protocols
Implemented additional measures to enhance email security
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 34 weeks(236 days from discovery to filing)
Compliance flags: ME AG >30d · 236dME resident >60d · 236d
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.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Nov 3, 2023
→ Filed with AG: Jun 26, 2024
236d 30 days (soft) ME AG >30d
Maine
Discovered: Nov 3, 2023
→ Notified: Jun 26, 2024
236d 60 days (analyst band; statutory cap is 30 days) ME resident >60d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Nov 3, 2023 → Filed with AG: Jun 26, 2024	236d	30 days (soft)	ME AG >30d
Maine	Discovered: Nov 3, 2023 → Notified: Jun 26, 2024	236d	60 days (analyst band; statutory cap is 30 days)	ME resident >60d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 5 states

View merged incident ↗

HHS OCRJun 25 · first

Vermont State AG+1d

Indiana State AG+1d

New Hampshire State AG+1d

Maine State AG+1d · 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://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/b28cf7f4-d807-4406-aa3f-12eb92e2bfa9.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 26, 2024
Raw hash: 1859bd7d5e7b327b870134f05c98b3a03143f6e40a4a36d11089044a725b197b

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityConstangy, Brooks, Smith & Prophete, LLP

Victim entityThe Mount Kisco Surgery Center LLC

Incidentdiscovered Nov 3, 2023

Stated responseEngaged a digital forensics and incident response firm to conduct an investigation

ComplianceME AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov