HackingHealthcareHealthcareBusiness Associate (HIPAA)Customer Data InvolvedData ExfiltratedPHIHealth (basic)Government IDIdentity (basic)Financial accountMediumContained

Graham County Hospital

bd_552342ca92f19318 · schema v1 · pii pii-v2

Severity

Medium

Discovered

Dec 18, 2025

Filed

Sep 1, 2026

To disclose

—

Affected

Not disclosed

Linked

2 filings

Confidence

69%

Full breach record for Graham County Hospital →

Aesto, LLC, a healthcare data migration and archiving service provider, experienced a cyber incident affecting its AWS infrastructure between December 2 and December 18, 2025. The incident was discovered on December 18, 2025. Forensic analysis confirmed that an unauthorized actor accessed and potentially acquired protected health information (PHI), including names, dates of birth, medical information, driver's license numbers, financial account numbers, health insurance information, ITINs, and Social Security numbers, for individuals affiliated with Graham County Hospital and other covered entities. Aesto engaged external cybersecurity professionals, secured the network, reset credentials, and deleted impacted Lambda functions and unauthorized files. No evidence of data misuse was found. Aesto notified covered entities on June 26, 2026, and offered to notify HHS OCR on their behalf.

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Incident timeline

undetected · 16 days

Dec 2, 2025

Begins

Dec 18, 2025

Discovered

Sep 1, 2026

Filed

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_6f94ad8afcd0294b2026-09-11 · +10dVerified

Name: AESTO, LLC
norm: aesto

Name: Graham County Hospital
norm: graham county hospital
Industry: Healthcarellm

Discovered: Dec 18, 2025
Breach occurred: Dec 2, 2025 – Dec 18, 2025
Undetected for: 16 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 26, 2026
Affected individuals: Not disclosed
Data types: PHIHealth (basic)Government IDIdentity (basic)Financial account
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: External
Regulator citations: Offering to notify HHS OCR on behalf of covered entities if they opt-in
Third party: via Aesto, LLC

During the incident: Launched a thorough investigation with experienced external cybersecurity professionals
Worked with cybersecurity professionals to secure our network
Reset credentials
Enhanced our security measures and monitoring tools
Reviewing our existing policies and training protocols
Providing an attestation from our cybersecurity professionals detailing the root cause of the incident
Changes made: Closed the security gaps exploited by the threat actor to gain access to the network
Deleted the impacted Lambda functions
Rotated all impacted AWS secrets
Deleted unauthorized files uploaded by the threat actor
Continuing monitoring of the network
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 · 2 filings · 2 states

View merged incident ↗

Massachusetts State AGSep 1 · first · this page

New Hampshire State AG+10d

Pattern: first filing Sep 1 (MA), last Sep 11 (NH) — a 10-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/2026-1556-graham-county-hospital/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 1, 2026
Raw hash: d575c7d4857957fd2cc2da101a1cd399ca18a599bfd17835eca31d9c800cdcf4

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityAESTO, LLC

Victim entityGraham County Hospital

Incidentdiscovered Dec 18, 2025

Stated responseLaunched a thorough investigation with experienced external cybersecurity professionals

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov