HackingHealthcareHealthcareData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDMediumContained

Hayward Sisters Hospital

bd_a500dfc433c91c42 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Nov 29, 2022

Filed

Aug 3, 2023

To disclose

35 weeks

Affected

Not disclosed

Linked

4 filings

Confidence

65%

Full breach record for Hayward Sisters Hospital →2 incidents on file

Hayward Sisters Hospital d/b/a St. Rose Hospital reported that an unknown actor gained unauthorized access to computer systems on November 18, 2022, and acquired files containing personal information including names, Social Security numbers, dates of birth, email addresses, and home addresses. The hospital discovered suspicious activity on November 29, 2022. The incident is contained, and the hospital has engaged forensic specialists, notified law enforcement and HHS, and offered 12 months of credit monitoring.

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California clockDiscovered Nov 29, 2022 → Notified Aug 3, 2023247d ✗ CA 60-day late35 weeks discovery → filing

Incident timeline

undetected · 11 days

discovery → filing · 35 weeks / 247 days

Nov 18, 2022

Begins

Nov 29, 2022

Discovered

Aug 3, 2023

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

Massachusetts State AGbd_994c442098d902092023-08-03Verified
Montana State AGbd_c647bef5fc030ca82023-08-03Verified
Vermont State AGbd_dc8c78dd1cdb3d152023-08-03Verified

Name: Hayward Sisters Hospital
norm: hayward sisters hospital

Name: Hayward Sisters Hospital
norm: hayward sisters hospital
Also named: Hayward Sisters Hospitaldba oflegal entity
St. Rose Hospitaldba oftrade name
Industry: Healthcarellm

Discovered: Nov 29, 2022
Breach occurred: Nov 18, 2022 – Nov 29, 2022
Undetected for: 11 daysoccurrence → discovery
Materiality determined: —
Notification sent: Aug 3, 2023
Affected individuals: Not disclosed
Data types: Identity (basic)Government ID
Data elements: Social Security number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: External
Regulator citations: Notifying applicable regulators, including the U.S. Department of Health and Human Services

During the incident: Took steps to secure our systems
Initiated an investigation into the nature and scope of the event with the assistance of third-party computer forensic specialists
Federal law enforcement is aware of this incident, and we are cooperating with their investigation
Offering credit monitoring and identity theft protection services for 12 months through Experian, at no cost to you
Changes made: Implemented additional security measures to further protect against similar incidents moving forward
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 35 weeks(247 days from discovery to filing)
Compliance flags: CA 60-day late · 247d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.
Clock breakdown: Statute Window Elapsed Threshold Status
California
Discovered: Nov 29, 2022
→ Notified: Aug 3, 2023
247d 60 days (analyst band, pre-2026 discoveries) CA 60-day late

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Nov 29, 2022 → Notified: Aug 3, 2023	247d	60 days (analyst band, pre-2026 discoveries)	CA 60-day late

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

Massachusetts State AGAug 3 · first

Montana State AGAug 3 · first

Vermont State AGAug 3 · first

California State AGAug 3 · 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://oag.ca.gov/ecrime/databreach/reports/sb24-571278
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 3, 2023
Raw hash: d9430a8c67cd147a3f9261ea00bf9159bac7d612e64dd5594f2aaaacc873eb47

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityHayward Sisters Hospital

Victim entityHayward Sisters Hospital

Incidentdiscovered Nov 29, 2022

Stated responseTook steps to secure our systems

ComplianceCA 60-day late

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov