MalwareHealthcareProfessional ServicesHealthcareRansomwareData ExfiltratedData EncryptedCustomer Data InvolvedAuthenticationBiometricCredentialsFinancial accountHealth (basic)Identity (basic)Government IDPHIHighContained

Healthcare Services Group, Inc.

bd_4e84de9fffe37399 · schema v1 · pii pii-v1

Severity

High

Discovered

Oct 7, 2024

Filed

Aug 25, 2025

To disclose

46 weeks

Affected

7,745state residents only

Linked

16 filings

Confidence

71%

Full breach record for Healthcare Services Group, Inc. →

Healthcare Services Group, Inc. disclosed a ransomware incident affecting Washington residents. Unauthorized access occurred between September 27 and October 3, 2024. The company discovered the breach on October 7, 2024, and notified 7,745 Washington residents on August 25, 2025. Compromised data included names, SSNs, DOBs, driver's licenses, financial accounts, PHI, credentials, and biometric identifiers.

J jump to incidentP pin to compareR raw source

Leak gap clock✗ Leak >180d46 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 · 10 days

discovery → filing · 46 weeks / 322 days

Sep 27, 2024

Begins

Oct 7, 2024

Discovered

Aug 25, 2025

Filed

vs. sector median

+34 wks slower

This filing is one of 16 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

New Hampshire State AGbd_2ff23a494fd0eb292025-08-25Verified
Nebraska State AGbd_3d13d9954098db8f2025-08-25Verified
Oregon State AGbd_4999f3b28468b2fa2025-08-25Verified
Montana State AGbd_662a2f295d85c2662025-08-25Verified

Show 6 more filings ↓up to 8d gap

Vermont State AGbd_82a73cadd59014cd2025-08-25Verified
Delaware State AGbd_846def17f6a32ff92025-08-25Verified
Indiana State AGbd_e2af2ec1ac336df22025-08-25Verified
Texas State AGbd_3c672d9cc70092502025-08-26 · +1dVerified
South Carolina State AGbd_7ca401b90e6988952025-08-26 · +1dVerified
Rhode Island State AGbd_dc5f8588b13682f72025-09-02 · +8dVerified

Showing first 10 of 15 linked disclosures.

Name: Healthcare Services Group, Inc.
norm: healthcare services
Domain: hcsgcorp.com

Name: Healthcare Services Group, Inc.
norm: healthcare services
Domain: hcsgcorp.com
Industry: HealthcarellmProfessional Servicesllm

Discovered: Oct 7, 2024
Breach occurred: Sep 27, 2024 – Oct 3, 2024
Undetected for: 10 daysoccurrence → discovery
Materiality determined: —
Notification sent: Aug 25, 2025
Affected individuals: 7,745state-resident count only
Data types: Identity (basic)Government IDFinancial accountPHIHealth (basic)CredentialsBiometric
Data elements: NameSocial Security numberDriver's licence numberFinancial account numberDate of birthPassport numberHealth insurance IDMedical informationBiometric dataUsername + password
WA-stated cause: Cyberattack
WA-stated duration: lifecycle 1-99dexposure 1-99d
WA-stated discovery: Found after the fact
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Notified federal law enforcement regarding the eventProviding written notice of this incident to relevant state regulators

During the incident: Moved quickly to investigate and respond to the incident
Assessed the security of HSGI systems
Identified potentially affected individuals
Notified federal law enforcement regarding the event
Providing access to credit monitoring services for twelve (12) months, through Experian
Providing impacted individuals with guidance on how to better protect against identity theft and fraud
Providing written notice of this incident to relevant state regulators
Providing written notice to the three major credit reporting agencies
Changes made: Implementing additional safeguards and training to its employees
Review and enhance existing policies and procedures relating to data protection and security
Implemented additional security measures to mitigate risk associated with this event
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 46 weeks(322 days from discovery to filing)
Compliance flags: Leak >180dWA 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 · 11 filings · 11 states

View merged incident ↗

New Hampshire State AGAug 25 · first

Nebraska State AGAug 25 · first

Oregon State AGAug 25 · first

Montana State AGAug 25 · first

Vermont State AGAug 25 · first

Delaware State AGAug 25 · first

Indiana State AGAug 25 · first

Washington State AGAug 25 · first · this page

Texas State AG+1d

South Carolina State AG+1d

Rhode Island State AG+8d

Pattern: first filing Aug 25 (NH), last Sep 2 (RI) — a 8-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Cascade drawn from the first 10 linked disclosures of 15 — the full spread may be wider.

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/BreachA34460.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 25, 2025
Raw hash: 2bdf8f23669adfc88d2a381ea4498eb3660e902304adbba1fb7d880a1d114427

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityHealthcare Services Group, Inc.

Victim entityHealthcare Services Group, Inc.

Incidentdiscovered Oct 7, 2024

Stated responseMoved quickly to investigate and respond to the incident

ComplianceLeak >180d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com