MalwareHealthcareFinancial ServicesHealthcareRansomwareData EncryptedSupply Chain (3P Vendor)Customer Data InvolvedPHIIdentity (basic)Government IDFinancial accountMediumContained

BLUE CROSS OF CALIFORNIA

bd_c7a53ca1dcbc2abc · schema v1 · pii pii-v1

Severity

Medium

Discovered

Aug 27, 2021

Filed

Oct 26, 2021

To disclose

9 weeks

Affected

Not disclosed

Linked

2 filings

Confidence

65%

Full breach record for BLUE CROSS OF CALIFORNIA →

Blue Cross of California notified members that a vendor experienced a ransomware attack on August 25, 2021. Blue Cross became aware of the incident on August 27, 2021. The attack potentially exposed protected health information, including names, dates of birth, SSNs, and bank account details. The affected server was shut down and rebuilt. Victims are offered one year of Experian IdentityWorks.

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Incident timeline

undetected · 2 days

discovery → filing · 9 weeks / 60 days

Aug 25, 2021

Begins

Aug 27, 2021

Discovered

Oct 26, 2021

Filed

vs. sector median

on median

This filing is one of 2 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

HHS OCRbd_6371d65bbccbedcd2021-10-27 · +1dVerified

Name: BLUE CROSS OF CALIFORNIA
norm: blue cross of california

Name: BLUE CROSS OF CALIFORNIA
norm: blue cross of california
Industry: HealthcarellmFinancial Servicesllm

Discovered: Aug 27, 2021
Breach occurred: Aug 25, 2021
Undetected for: 2 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: PHIIdentity (basic)Government IDFinancial account
Data elements: Social Security numberDate of birth
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1195 Supply Chain Compromise
Threat actor: ExternalFinancial
Third party: via Vendor of Blue Cross of CA
Initial access: supply_chain

During the incident: Looked into what caused this issue
Affected server was shut down and rebuilt
A report has been filed with local authorities through the Internet Crime Complaint Center
Offering a complimentary one-year membership of Experian’s IdentityWorks
Changes made: Taking steps to reduce the risk of this happening again
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 9 weeks(60 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

California State AGOct 26 · first · this page

HHS OCR+1d

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://oag.ca.gov/ecrime/databreach/reports/sb24-546858
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 26, 2021
Raw hash: 0f3a2879307ac0730a61def8e704f0df9f3d99f0f9171c39c731bf6922d88f2e

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityBLUE CROSS OF CALIFORNIA

Victim entityBLUE CROSS OF CALIFORNIA

Incidentdiscovered Aug 27, 2021

Stated responseLooked into what caused this issue

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov