HackingHealthcareHealthcareData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDMediumContained

Hayward Sisters Hospital

bd_c37cc8a186a5b0f2 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Nov 29, 2022

Filed

Jan 12, 2023

To disclose

6 weeks

Affected

Not disclosed

Linked

2 filings

Confidence

65%

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

Hayward Sisters Hospital d/b/a St. Rose Hospital disclosed that an unknown actor gained 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. This supplemental notice updates a preliminary notice sent in December 2022. The hospital engaged forensic specialists, secured systems, and is offering 12 months of credit monitoring.

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California clockDiscovered Nov 29, 2022 → Notified Jan 1, 202333d ✓ CA 60-day OK6 weeks discovery → filing

Incident timeline

undetected · 11 days

discovery → filing · 6 weeks / 44 days

Nov 18, 2022

Begins

Nov 29, 2022

Discovered

Jan 12, 2023

Filed

vs. sector median

5 wks faster

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

HHS OCRbd_e4d8736a57ce09b12023-01-27 · +15dCandidate

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
Undetected for: 11 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jan 1, 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: Federal law enforcement is aware of this incident, and we are cooperating with their investigation

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
Implemented additional security measures to further protect against similar incidents moving forward
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: 6 weeks(44 days from discovery to filing)
Compliance flags: CA 60-day OK · 33d
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: Jan 1, 2023
33d 60 days (analyst band, pre-2026 discoveries) CA 60-day OK

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Nov 29, 2022 → Notified: Jan 1, 2023	33d	60 days (analyst band, pre-2026 discoveries)	CA 60-day OK

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings

View merged incident ↗

California State AGJan 12 · first · this page

HHS OCR+15d

Pattern: first filing Jan 12 (CA), last Jan 27 (CA) — a 15-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://oag.ca.gov/ecrime/databreach/reports/sb24-561653
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jan 12, 2023
Raw hash: 290fe997dc1e7ed6ff42bb00a488315cb0cb26816b9f2e9df8f99f1d2944120d

Linked disclosures

Regulatory filings (1) · 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 OK

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov