MalwareHealthcareHealthcareRansomwareData ExfiltratedData EncryptedCustomer Data InvolvedTargetedFinancial accountHealth (basic)Identity (basic)Government IDPHIPIIHighContained

Kitsap Mental Health Services

bd_b87b2c12fb2d234f · schema v1 · pii pii-v1

Severity

High

Discovered

Oct 17, 2024

Filed

Dec 16, 2024

To disclose

9 weeks

Affected

56,981state residents only

Linked

3 filings

Confidence

69%

Full breach record for Kitsap Mental Health Services →2 incidents on file

Kitsap Mental Health Services (KMHS) reported a supplemental ransomware incident affecting 56,981 Washington residents. Unauthorized access occurred between Sept 17 and Oct 19, 2024; detected Oct 17, 2024. Data included PHI, SSNs, DOBs, and financial info. Notices mailed May 14, 2025.

J jump to incidentP pin to compareR raw source

Washington clock⏱ WA AG >30d9 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 · 30 days

discovery → filing · 9 weeks / 60 days

Sep 17, 2024

Begins

Oct 17, 2024

Discovered

Dec 16, 2024

Filed

vs. sector median

4 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

HHS OCRbd_1810011549f8bdc62024-12-16Candidate
HHS OCRbd_4b01037e623c33412024-12-16Verified

Name: Kitsap Mental Health Services
norm: kitsap mental health

Name: Kitsap Mental Health Services
norm: kitsap mental health
Industry: Healthcarellm

Discovered: Oct 17, 2024
Breach occurred: Sep 17, 2024 – Oct 19, 2024
Undetected for: 30 daysoccurrence → discovery
Materiality determined: —
Notification sent: May 14, 2025
Affected individuals: 56,981state-resident count only
Data types: Identity (basic)Government IDHealth (basic)Financial accountPII
Data elements: NameSocial Security numberDriver's licence numberFinancial account numberDate of birthHealth insurance IDMedical information
WA-stated cause: Cyberattack
WA-stated duration: lifecycle 1-99dexposure 1-99d
WA-stated discovery: Found while ongoing
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Provided notice to the Department of Health and Human Services Office for Civil RightsReporting to law enforcementReported this Incident to relevant government agencies

During the incident: Changed passwords
Deployed tools for increased monitoring
Reporting to law enforcement
Engaging data security and privacy experts to assist
Implementing endpoint detection and response monitoring
Add further technical safeguards to existing protections
Reported this Incident to relevant government agencies
Changes made: Implementing endpoint detection and response monitoring
Add further technical safeguards to existing protections
Offering complimentary access to Experian IdentityWorks for twelve (12) months
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 9 weeks(60 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

View merged incident ↗

HHS OCRDec 16 · first

Washington State AGDec 16 · 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/BreachA31719.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Dec 16, 2024
Raw hash: 7aa5019d9480b4b0ae2ad5005f4876512dbc8d11c1cc68c4f4b84198526ffe69

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityKitsap Mental Health Services

Victim entityKitsap Mental Health Services

Incidentdiscovered Oct 17, 2024

Stated responseChanged passwords

ComplianceWA AG >30d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com