HackingFinancial ServicesHealthcareFinanceVulnerability ExploitData ExfiltratedTargetedIdentity (basic)Government IDPHIHealth (basic)MediumContained

DELTA DENTAL OF CALIFORNIA

bd_f32bc4138c99af89 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jun 1, 2023

Filed

Feb 7, 2024

To disclose

36 weeks

Affected

844state residents only

Linked

11 filings

Confidence

68%

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

Delta Dental of California experienced a data breach involving the MOVEit Transfer software vulnerability. Unauthorized access occurred between May 27-30, 2023. The company discovered the incident on June 1, 2023, and notified affected individuals starting November 27, 2023. 844 Washington residents were affected. Data types included identity and government information. Response actions included patching, password resets, and engaging forensic experts.

J jump to incidentP pin to compareR raw source

Washington clock⏱ WA AG >30d36 weeks discovery → filing

Incident timeline

undetected · 5 days

discovery → filing · 36 weeks / 251 days

May 27, 2023

Begins

Jun 1, 2023

Discovered

Feb 7, 2024

Filed

vs. sector median

+27 wks slower

This filing is one of 11 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Montana State AGbd_999bf44f190153fb2024-02-07Verified
Washington State AGbd_2b669447999006a92024-01-30 · +8dVerified
New Hampshire State AGbd_b33482b171701d942024-03-15 · +37dVerified
Hawaii State AGbd_48ccff9e491e5a462024-03-18 · +40dVerified

Show 6 more filings ↓up to 55d gap

Maine State AGbd_b0392e182589e9502023-12-29 · +40dVerified by operator
Massachusetts State AGbd_2aecb331d440f93c2023-12-14 · +55dVerified
Oregon State AGbd_2c29103cacdbca1f2023-12-14 · +55dCandidate
Vermont State AGbd_40e8f6904a6f52b92023-12-14 · +55dVerified
Montana State AGbd_54f04c0719e262cf2023-12-14 · +55dVerified
Washington State AGbd_9c3c9a75bc9bb9122023-12-14 · +55dVerified

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: 844state-resident count only
Data types: Identity (basic)Government ID
Data elements: NameSocial Security numberMedical information
WA-stated cause: Unauthorized Access
WA-stated duration: lifecycle 200-299dexposure 1-99d
WA-stated discovery: Found after the fact
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 Channel
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: 36 weeks(251 days from discovery to filing)
Compliance flags: WA AG >30d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 8 states

View merged incident ↗

Massachusetts State AGDec 14 · first

Oregon State AGDec 14 · first

Vermont State AGDec 14 · first

Montana State AGDec 14 · first

Washington State AGDec 14 · first

Maine State AG+15d

Washington State AG+47d

Montana State AG+55d

Washington State AG+55d · this page

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?

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://agportal-s3bucket.s3.amazonaws.com/databreach/BreachA27852.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Feb 7, 2024
Raw hash: 3f9c5ce196dc055dfceaef9704d1d44d4d011ca5cd67cbfba8e88f4c0159eb69

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

ComplianceWA AG >30d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com