HackingHealthcareTechnologyHealthcareData ExfiltratedBusiness Associate (HIPAA)Customer Data InvolvedDelayed DiscoveryPHIIdentity (basic)Government IDFinancial accountHealth (basic)MediumContained

Aesto Health

bd_44b55c8508053bbd · schema v1 · pii pii-v2

Severity

Medium

Discovered

Dec 18, 2025

Filed

Aug 20, 2026

To disclose

35 weeks

Affected

11state residents only

Linked

4 filings

Confidence

65%

Full breach record for Aesto Health →6 incidents on file

Aesto LLC d/b/a Aesto Health, a healthcare data migration and archiving services provider, experienced a network security incident impacting its AWS infrastructure. An unauthorized actor accessed and copied protected health information (PHI) and personally identifiable information (PII), including names, medical record numbers, Social Security numbers, and financial account numbers, between December 2 and December 18, 2025. Aesto detected the incident on December 18, 2025, and contained it. Forensic investigation confirmed the scope in May 2026. Valley Perinatal Services, LLC, a covered entity client, notified the New Hampshire Attorney General that 11 New Hampshire residents were affected. Notices were mailed to affected individuals in August 2026. Credit monitoring services were provided.

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Incident timeline

undetected · 16 days

discovery → filing · 35 weeks / 245 days

Dec 2, 2025

Begins

Dec 18, 2025

Discovered

Aug 20, 2026

Filed

vs. sector median

+24 wks slower

This filing is one of 4 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

New Hampshire State AGbd_bf704f7baef228c12026-08-19 · +1dCandidate
California State AGbd_cb2bb8a2cd3f59b62026-08-25 · +5dVerified
New Hampshire State AGbd_3b97726fa4a0fefa2026-08-11 · +9dCandidate

Name: Valley Perinatal Services
norm: valley perinatal
Domain: valleyperinatal.com

Name: Aesto Health
norm: aesto health
Domain: aestohealth.com
Also named: Aesto LLCdba oflegal entity
Aesto Healthdba oftrade name
Industry: HealthcarellmTechnologyllm

Discovered: Dec 18, 2025
Breach occurred: Dec 2, 2025 – Dec 18, 2025
Undetected for: 16 daysoccurrence → discovery
Materiality determined: —
Notification sent: Aug 21, 2026
Affected individuals: 11state-resident count only
Data types: PHIIdentity (basic)Government IDFinancial accountHealth (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: External
Regulator citations: Filed notice with New Hampshire Office of Attorney General
Third party: via Aesto LLC d/b/a Aesto Health

During the incident: Commenced an investigation into the full nature and scope of the incident
Worked closely with third-party forensic specialists
Contained the incident
Notified Covered Entity clients whose patient information was included in the files potentially accessed or acquired by the unauthorized party
Posted notice of this event on its website
Provided notice to major statewide media in New Hampshire
Began mailing notice letters to affected New Hampshire residents
Set up a dedicated and confidential toll-free response line
Providing access to Single Bureau Credit Monitoring/Single Bureau Credit Report/Single Bureau Credit Score services at no charge through Cyberscout
Changes made: Continually evaluates and modifies its practices and internal controls to enhance the security and privacy of personal information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 35 weeks(245 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 2 states

View merged incident ↗

New Hampshire State AGAug 11 · first

New Hampshire State AG+8d

New Hampshire State AG+9d · this page

California State AG+14d

Pattern: first filing Aug 11 (NH), last Aug 25 (CA) — a 14-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://mm.nh.gov/files/uploads/doj/remote-docs/valley-perinatal-services-20260820.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 20, 2026
Raw hash: 8db82cb360b6d2fae45ce6c386db24298cd75990813ac28da1f24a4031358b78

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityValley Perinatal Services

Victim entityAesto Health

Incidentdiscovered Dec 18, 2025

Stated responseCommenced an investigation into the full nature and scope of the incident

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov