HackingHealthcareTechnologyHealthcareVulnerability ExploitData ExfiltratedCustomer Data InvolvedDelayed DiscoveryIdentity (basic)Government IDMediumContained

Anthem Blue Cross Blue Shield

bd_1d2bf60075702a7d · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jul 26, 2023

Filed

Apr 3, 2024

To disclose

34 weeks

Affected

4state residents only

Confidence

66%

Full breach record for Anthem Blue Cross Blue Shield →23 incidents on file

Welltok, Inc. reported a cybersecurity incident involving the MOVEit Transfer server for Anthem Blue Cross Blue Shield. An unknown actor exploited software vulnerabilities to access the server on May 30, 2023, and exfiltrated data. Welltok discovered the breach on August 11, 2023, after a third-party investigation. Approximately 4 New Hampshire residents were notified on January 23, 2024. Data types included identity and government identifiers. Welltok provided credit monitoring via Experian.

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Incident timeline

undetected · 57 days

discovery → filing · 36 weeks / 252 days

May 30, 2023

Begins

Jul 26, 2023

Discovered

Apr 3, 2024

Filed

vs. sector median

+22 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed4 affectedView incident

Name: Welltok
norm: welltok
Domain: welltok.com

Name: Anthem Blue Cross Blue Shield
norm: anthem blue cross blue shield
Domain: abcbs.anthem.com
Industry: HealthcarellmTechnologyllm

Discovered: Jul 26, 2023
Breach occurred: May 30, 2023
Undetected for: 57 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jan 23, 2024
Affected individuals: 4state-resident count only
Data types: Identity (basic)Government ID
Attack vector: Unauthorized Access
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
Provided access to credit monitoring services for ... through Experian
Providing impacted individuals with guidance on how to better protect against identity theft and fraud
Changes made: Reviewing and enhancing our existing policies and procedures related to data privacy
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 34 weeks(236 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

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://mm.nh.gov/files/uploads/doj/remote-docs/welltok-20240403.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 3, 2024
Raw hash: 4a1b246774815a0e878e7b261d1d16da5dcb1bba655fb1cd7d37b00ba3e1c5d7

Reporting entityWelltok

Victim entityAnthem Blue Cross Blue Shield

Incidentdiscovered Jul 26, 2023

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

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov