HackingFinancial ServicesHealthcareFinanceVulnerability ExploitZero-DayData ExfiltratedTargetedPIIIdentity (basic)Government IDHighContained

DELTA DENTAL OF CALIFORNIA

bd_54f04c0719e262cf · schema v1 · pii pii-v1

Severity

High

Discovered

Jun 1, 2023

Filed

Dec 14, 2023

To disclose

28 weeks

Affected

48,026state residents only

Linked

14 filings

Confidence

64%

Full breach record for DELTA DENTAL OF CALIFORNIA →5 incidents on file

Delta Dental of California disclosed a data security incident involving the MOVEit Transfer software. Unauthorized actors exploited a previously unknown vulnerability (zero-day) to access and acquire company information between May 27-30, 2023. The company discovered the incident on June 1, 2023, and notified affected individuals on November 27, 2023. Response actions included patching, password resets, and engaging forensic experts. Law enforcement was notified. Affected data includes PII and government IDs. 24 months of identity monitoring via Kroll was offered.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 5 days

discovery → filing · 28 weeks / 196 days

May 27, 2023

Begins

Jun 1, 2023

Discovered

Dec 14, 2023

Filed

vs. sector median

+20 wks slower

This filing is one of 14 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Massachusetts State AGbd_2aecb331d440f93c2023-12-14Verified
Oregon State AGbd_2c29103cacdbca1f2023-12-14Candidate
Vermont State AGbd_40e8f6904a6f52b92023-12-14Verified
Maine State AGbd_b0392e182589e9502023-12-29 · +15dVerified by operator

Show 6 more filings ↓up to 95d gap

Washington State AGbd_2b669447999006a92024-01-30 · +47dVerified
Montana State AGbd_999bf44f190153fb2024-02-07 · +55dVerified
Washington State AGbd_f32bc4138c99af892024-02-07 · +55dVerified
California State AGbd_ed716715756a40722024-03-14 · +91dVerified
New Hampshire State AGbd_b33482b171701d942024-03-15 · +92dVerified
Hawaii State AGbd_48ccff9e491e5a462024-03-18 · +95dVerified

Showing first 10 of 13 linked disclosures.

Name: DELTA DENTAL OF CALIFORNIA
norm: delta dental of california
Domain: deltadentalca.com

Name: DELTA DENTAL OF CALIFORNIA
norm: delta dental of california
Domain: deltadentalca.com
Industry: Financial ServicesllmHealthcarellm

Discovered: Jun 1, 2023
Breach occurred: May 27, 2023 – May 30, 2023
Undetected for: 5 daysoccurrence → discovery
Materiality determined: —
Notification sent: Nov 27, 2023
Affected individuals: 48,026state-resident count only
Data types: PIIIdentity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1486 Data Encrypted for Impact
Threat actor: ExternalFinancial
Regulator citations: Notified law enforcement of the incident and have been cooperating with them
Initial access: exploit_public_facing

During the incident: Stopped access to the MOVEit software
Removed the malicious files
Conducted a thorough analysis of the MOVEit database
Applied the recommended patches
Reset administrative passwords to the MOVEit system
Enhanced unauthorized access monitoring related to MOVEit Transfer file access, malicious activity, and ransomware activity
Engaged independent third-party experts in computer forensics, analytics, and data mining
Notified law enforcement of the incident and have been cooperating with them
Changes made: Offering 24 months of free identity monitoring services through Kroll
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 28 weeks(196 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 9 states

View merged incident ↗

Massachusetts State AGDec 14 · first

Oregon State AGDec 14 · first

Vermont State AGDec 14 · first

Montana State AGDec 14 · first · this page

Maine State AG+15d

Washington State AG+47d

Montana State AG+55d

Washington State AG+55d

California State AG+91d

New Hampshire State AG+92d

Hawaii State AG+95d

Pattern: first filing Dec 14 (MA), last Mar 18 (HI) — a 95-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 13 — 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://dojmt.gov/wp-content/uploads/OCP/Consumer-notification-letter-946.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Dec 14, 2023
Raw hash: 3dd7cb48be17c8d3590ed984d1593eafa8098e4d8ebf7bd7b8b6dd30c8a147e3

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityDELTA DENTAL OF CALIFORNIA

Victim entityDELTA DENTAL OF CALIFORNIA

Incidentdiscovered Jun 1, 2023

Stated responseStopped access to the MOVEit software

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov