HackingHealthcareHealthcareStolen CredentialsSupply Chain (3P Vendor)Customer Data InvolvedFinancial accountIdentity (basic)PHIHealth (basic)MediumContained

King County Public Hospital District No. 2

bd_fccb3bd77e21b9fe · schema v1 · pii pii-v1

Severity

Medium

Discovered

Apr 26, 2021

Filed

Jul 13, 2021

To disclose

11 weeks

Affected

20,215state residents only

Linked

3 filings

Confidence

69%

Full breach record for King County Public Hospital District No. 2 →3 incidents on file

EvergreenHealth notified Washington AG of a breach involving patient data (names, DOB, insurance status, limited payment info) exposed via Accellion file transfer service compromise. Incident discovered April 26, 2021; notifications sent July 13, 2021. 20,215 WA residents affected.

J jump to incidentP pin to compareR raw source

Washington clock⏱ WA AG >30d11 weeks 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 · 146 days

discovery → filing · 11 weeks / 78 days

Dec 1, 2020

Begins

Apr 26, 2021

Discovered

Jul 13, 2021

Filed

vs. sector median

1 wks faster

This filing is one of 3 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

Montana State AGbd_8f9754216de065df2021-07-13Verified
HHS OCRbd_ef6f778461d5ecfb2021-07-13Verified

Name: King County Public Hospital District No. 2
norm: king county public hospital district no 2

Name: King County Public Hospital District No. 2
norm: king county public hospital district no 2
Also named: King County Public Health Hospital District No. 2dba oflegal entity
Evergreen Healthdba oftrade name
Industry: Healthcarellm

Discovered: Apr 26, 2021
Breach occurred: Dec 1, 2020
Undetected for: 146 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jul 13, 2021
Affected individuals: 20,215state-resident count only
Data types: Identity (basic)Financial account
Data elements: NameDate of birthHealth insurance ID
WA-stated cause: Cyberattack
WA-stated duration: lifecycle Unknowndexposure Unknownd
WA-stated discovery: Found after the fact
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain CompromiseT1078 Valid Accounts
Threat actor: External
Regulator citations: Notified Washington Attorney General Consumer Protection Division
Third party: via Accellion
Initial access: valid_credentials

During the incident: Launched an internal investigation to identify the individuals whose information may have been contained in the files involved
Established a dedicated, toll-free call center to answer questions
Provided written notification to individuals whose information was involved in the incident
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 11 weeks(78 days from discovery to filing)
Compliance flags: WA AG >30d
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 · 3 filings · 2 states

View merged incident ↗

Montana State AGJul 13 · first

HHS OCRJul 13 · first

Washington State AGJul 13 · 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://agportal-s3bucket.s3.amazonaws.com/databreach/BreachM10813.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 13, 2021
Raw hash: a066b1bb9d704de81598287ad6247463f6721108b22c57cf2e5036d4b34a96c4

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityKing County Public Hospital District No. 2

Victim entityKing County Public Hospital District No. 2

Incidentdiscovered Apr 26, 2021

Stated responseLaunched an internal investigation to identify the individuals whose information may have been contained in the files involved

ComplianceWA AG >30d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com