HackingHealthcareTechnologyHealthcareVulnerability ExploitData ExfiltratedTargetedIdentity (basic)Government IDMediumContained

The Group Health Plans of Stanford Health Care

bd_037042af7f219bfc · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jul 26, 2023

Filed

Nov 18, 2023

To disclose

14 weeks

Affected

Not disclosed

Confidence

65%

Full breach record for The Group Health Plans of Stanford Health Care →

Welltok, Inc. notified The Group Health Plans of Stanford Health Care of a data breach involving the MOVEit Transfer server. An unknown actor exploited software vulnerabilities on May 30, 2023, to access and exfiltrate data. The incident was discovered on August 11, 2023. Affected data includes identity information. Welltok engaged third-party cybersecurity specialists and is offering credit monitoring services.

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Vermont clock✗ VT AG >45 bday14 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 57 days

discovery → filing · 16 weeks / 115 days

May 30, 2023

Begins

Jul 26, 2023

Discovered

Nov 18, 2023

Filed

vs. sector median

+3 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.ConfirmedView incident

Name: Welltok
norm: welltok
Domain: welltok.com

Name: The Group Health Plans of Stanford Health Care
norm: the group health plans of stanford health care
Industry: HealthcarellmTechnologyllm

Discovered: Jul 26, 2023
Breach occurred: May 30, 2023
Undetected for: 57 daysoccurrence → discovery
Materiality determined: —
Notification sent: Nov 17, 2023
Affected individuals: Not disclosed
Data types: Identity (basic)Government ID
Attack vector: Misconfiguration
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Initial access: exploit_public_facing

During the incident: Launched an additional investigation with the assistance of third-party cybersecurity specialists
Offering complimentary access to Experian IdentityWorks for ## months
Changes made: Reviewing and enhancing existing policies and procedures related to data privacy
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 14 weeks(99 days from discovery to filing)
Compliance flags: VT AG >45 bday
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

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://ago.vermont.gov/document/2023-11-18-group-health-plans-stanford-health-care-data-breach-notice-consumers
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 18, 2023
Raw hash: c9eb95b548ed9a5a0e697439dbd9369ff6bc3f92ba146781356cbcb64f1551b2

Reporting entityWelltok

Victim entityThe Group Health Plans of Stanford Health Care

Incidentdiscovered Jul 26, 2023

Stated responseLaunched an additional investigation with the assistance of third-party cybersecurity specialists

ComplianceVT AG >45 bday

Extraction provenanceno artifact recorded

Source provenanceago.vermont.gov