HackingHealthcareHealthcareStolen CredentialsCapture Stored DataData ExfiltratedCustomer Data InvolvedEmployee Data InvolvedIdentity (basic)Government IDHealth (basic)PHIMediumContained

HOSPITAL SISTERS HEALTH SYSTEM

bd_8324213e82150fab · schema v1 · pii pii-v1

Severity

Medium

Discovered

Aug 27, 2023

Filed

Feb 6, 2025

To disclose

18 months

Affected

662state residents only

Linked

4 filings

Confidence

69%

Full breach record for HOSPITAL SISTERS HEALTH SYSTEM →14 incidents on file

Hospital Sisters Health System (HSHS) notified the Washington AG of a breach affecting 662 WA residents. Unauthorized access occurred Aug 16-27, 2023. Data included names, SSNs, driver's licenses, PHI. HSHS engaged forensic investigators, notified law enforcement, and offered credit monitoring.

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Washington clock✗ WA AG >90d18 months discovery → filing

⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 11 days

discovery → filing · 18 months / 529 days

Aug 16, 2023

Begins

Aug 27, 2023

Discovered

Feb 6, 2025

Filed

vs. sector median

+63 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

California State AGbd_63d403f97d8c8da82025-02-06Verified
Maine State AGbd_8dc5bdc41b329c972025-02-06Verified
New Hampshire State AGbd_72355d0affccd4a02025-02-07 · +1dVerified

Name: HOSPITAL SISTERS HEALTH SYSTEM
norm: hospital sisters health system

Name: HOSPITAL SISTERS HEALTH SYSTEM
norm: hospital sisters health system
Industry: Healthcarellm

Discovered: Aug 27, 2023
Breach occurred: Aug 16, 2023 – Aug 27, 2023
Undetected for: 11 daysoccurrence → discovery
Materiality determined: —
Notification sent: Aug 30, 2024
Affected individuals: 662state-resident count only
Data types: Identity (basic)Government IDHealth (basic)PHI
Data elements: NameSocial Security numberDriver's licence numberDate of birthHealth insurance IDMedical information
WA-stated cause: Unauthorized Access
WA-stated duration: lifecycle 1-99dexposure 1-99d
WA-stated discovery: Found while ongoingContained same day
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: External
Regulator citations: Notified Washington Attorney General
Initial access: valid_credentials

During the incident: Took steps to contain and remediate the incident
Launched an internal investigation
Reported the incident to law enforcement
Engaged a leading forensic security firm to assist in the investigation and confirm the security of the HSHS computer systems and network
Changes made: Enhancing our technical security measures
Offering complimentary credit monitoring and identity theft protection services
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 18 months(529 days from discovery to filing)
Compliance flags: WA AG >90d
Discovery-date grounding: AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

California State AGFeb 6 · first

Maine State AGFeb 6 · first

Washington State AGFeb 6 · first · this page

New Hampshire State AG+1d

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://agportal-s3bucket.s3.amazonaws.com/databreach/BreachM18448.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Feb 6, 2025
Raw hash: a57ebb5b709e9f776db1b13376fc1386803bad20804d0bc468c67689d9901892

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityHOSPITAL SISTERS HEALTH SYSTEM

Victim entityHOSPITAL SISTERS HEALTH SYSTEM

Incidentdiscovered Aug 27, 2023

Stated responseTook steps to contain and remediate the incident

ComplianceWA AG >90d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com