HackingHealthcareHealthcareIdentity (basic)Government IDCritical

GROUP HEALTH COOPERATIVE OF SOUTH CENTRAL WISCONSIN

bd_7d9f6fe2b75d08b8 · schema v1 · pii pii-v1

Severity

Critical

Discovered

Jan 25, 2024

Filed

Apr 8, 2024

To disclose

11 weeks

Affected · nationwide

533,809107 in this filing

Linked

4 filings

Confidence

65%

Full breach record for GROUP HEALTH COOPERATIVE OF SOUTH CENTRAL WISCONSIN →

Group Health Cooperative of South Central WI reported a data breach affecting 533,809 individuals. The breach, described as an external system hack, occurred on January 24, 2024, and was discovered the following day. Compromised information included names and Social Security numbers. The organization began notifying affected individuals on February 9, 2024, and offered 12 months of identity theft protection services.

J jump to incidentP pin to compareR raw source

Maine clockDiscovered Jan 25, 2024 → Filed with AG Apr 8, 202474d ⏱ ME 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 · 1 days

discovery → filing · 11 weeks / 74 days

Jan 24, 2024

Begins

Jan 25, 2024

Discovered

Apr 8, 2024

Filed

vs. sector median

2 wks faster

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

Massachusetts State AGbd_009d2e599b94c6382024-04-08Verified
HHS OCRbd_453e14285276c3d32024-04-08Verified by operator
Wisconsin State AGbd_f89f7efae99505a42024-02-09 · +59dVerified by operator

Name: GROUP HEALTH COOPERATIVE OF SOUTH CENTRAL WISCONSIN
norm: group health cooperative of south central wisconsin

Name: GROUP HEALTH COOPERATIVE OF SOUTH CENTRAL WISCONSIN
norm: group health cooperative of south central wisconsin
Industry: Healthcarellm

Discovered: Jan 25, 2024
Breach occurred: Jan 24, 2024
Undetected for: 1 dayoccurrence → discovery
Materiality determined: —
Notification sent: Feb 9, 2024
Affected individuals: 533,809state + nationwide
Data types: Identity (basic)Government ID
Data elements: Social Security number
Attack vector: Unauthorized Access
Threat actor: External

During the incident: Offered 12 months of identity theft protection services from Cyberscout through Identity Force, a TransUnion company
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 11 weeks(74 days from discovery to filing)
Compliance flags: ME AG >30d · 74d
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.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Jan 25, 2024
→ Filed with AG: Apr 8, 2024
74d 30 days (soft) ME AG >30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Jan 25, 2024 → Filed with AG: Apr 8, 2024	74d	30 days (soft)	ME AG >30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 3 states

View merged incident ↗

Wisconsin State AGFeb 9 · first

Massachusetts State AG+59d

HHS OCR+59d

Maine State AG+59d · this page

Pattern: first filing Feb 9 (WI), last Apr 8 (ME) — a 59-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://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/d863c624-4da1-49ce-bede-3f7a7e271ddc.shtml
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 8, 2024
Raw hash: c31994dbe53043d9459b28ccedbff89831212dddb1491d8ff4f5f97243629752

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityGROUP HEALTH COOPERATIVE OF SOUTH CENTRAL WISCONSIN

Victim entityGROUP HEALTH COOPERATIVE OF SOUTH CENTRAL WISCONSIN

Incidentdiscovered Jan 25, 2024

Stated responseOffered 12 months of identity theft protection services from Cyberscout through Identity Force, a TransUnion company

ComplianceME AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov