HackingHealthcareHealthcareData ExfiltratedSupply Chain (3P Vendor)Customer Data InvolvedHealth (basic)Identity (basic)Government IDPHIMediumContained

Southfield Rehabilitation Company, LLC

bd_1b447ebd991ab588 · schema v1 · pii pii-v2

Severity

Medium

Discovered

—

Filed

Aug 1, 2026

To disclose

—

Affected

12state residents only

Linked

3 filings

Confidence

64%

Full breach record for Southfield Rehabilitation Company, LLC →

Aesto, LLC, a healthcare data migration and archiving vendor for Surgeons Choice Medical Center (dba of Southfield Rehabilitation Company LLC), experienced a network security incident impacting its AWS infrastructure. An unauthorized actor copied protected health information (PHI) between December 2 and December 18, 2025. The incident was discovered on December 18, 2025. Forensic investigation confirmed data exfiltration. No evidence of misuse was found. Affected individuals in multiple states are offered 24 months of credit monitoring.

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Incident timeline

Dec 2, 2025

Begins

Aug 1, 2026

Filed

This filing is one of 3 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

Vermont State AGbd_735679d135123d422026-08-21 · +20dVerified
New Hampshire State AGbd_eac49aabb3a023ff2026-08-21 · +20dVerified

Name: Southfield Rehabilitation Company, LLC
norm: southfield rehabilitation

Name: Southfield Rehabilitation Company, LLC
norm: southfield rehabilitation
Also named: Southfield Rehabilitation Company LLCdba oflegal entity
Surgeons Choice Medical Centerdba oftrade name
Industry: Healthcarellm

Discovered: —
Breach occurred: Dec 2, 2025 – Dec 18, 2025
Materiality determined: —
Notification sent: Aug 21, 2026
Affected individuals: 12state-resident count only
Data types: Health (basic)Identity (basic)Government IDPHI
Attack vector: Unauthorized Access
MITRE ATT&CK: T1041 Exfiltration Over C2 ChannelT1119 Automated Collection
Threat actor: External
Third party: via Aesto, LLC

During the incident: Commenced a prompt and thorough investigation
Worked very closely with external cybersecurity professionals experienced in handling these types of incidents
Conducted extensive forensic investigation and manual document review
Offering a complimentary 24 Months membership of Single Bureau Credit Monitoring/Single Bureau Credit Report/Single Bureau Credit Score services at no charge
Changes made: Continually evaluate and modify practices and internal controls to enhance the security and privacy of personal information
Source: Quoted from the filing itself, not independently verified.

Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Massachusetts State AGAug 1 · first · this page

Vermont State AG+20d

New Hampshire State AG+20d

Pattern: first filing Aug 1 (MA), last Aug 21 (NH) — a 20-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://www.mass.gov/doc/2026-1404-southfield-rehabilitation-company-llc-dba-surgeons-choice-medical-center/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 1, 2026
Raw hash: dea14181a26318dca24919df85ba7906c2b4ad18c1d40d6e2cc37ec0fe2e3ea7

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entitySouthfield Rehabilitation Company, LLC

Victim entitySouthfield Rehabilitation Company, LLC

IncidentUnauthorized Access

Stated responseCommenced a prompt and thorough investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov