HackingHealthcareFinancial ServicesHealthcareVulnerability ExploitZero-DayData ExfiltratedTargetedFinancial accountIdentity (basic)Government IDPHIHealth (basic)HighContained

DELTA DENTAL OF CALIFORNIA

bd_2b669447999006a9 · schema v1 · pii pii-v1

Severity

High

Discovered

Jun 1, 2023

Filed

Jan 30, 2024

To disclose

35 weeks

Affected

1,186state residents only

Linked

11 filings

Confidence

70%

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

Delta Dental of California reported a data breach involving the MOVEit Transfer software vulnerability. Unauthorized access occurred between May 27-30, 2023, and was discovered on June 1, 2023. The incident impacted 1,186 Washington residents, with personal information including names and government IDs exposed. The company engaged forensic experts, patched the vulnerability, and offered 24 months of identity monitoring.

J jump to incidentP pin to compareR raw source

Washington clock✗ WA AG >90d35 weeks discovery → filing

⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 5 days

discovery → filing · 35 weeks / 243 days

May 27, 2023

Begins

Jun 1, 2023

Discovered

Jan 30, 2024

Filed

vs. sector median

+22 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_999bf44f190153fb2024-02-07 · +8dVerified
Washington State AGbd_f32bc4138c99af892024-02-07 · +8dVerified
Maine State AGbd_b0392e182589e9502023-12-29 · +32dVerified by operator
New Hampshire State AGbd_b33482b171701d942024-03-15 · +45dVerified

Show 6 more filings ↓up to 48d gap

Massachusetts State AGbd_2aecb331d440f93c2023-12-14 · +47dVerified
Oregon State AGbd_2c29103cacdbca1f2023-12-14 · +47dCandidate
Vermont State AGbd_40e8f6904a6f52b92023-12-14 · +47dVerified
Montana State AGbd_54f04c0719e262cf2023-12-14 · +47dVerified
Washington State AGbd_9c3c9a75bc9bb9122023-12-14 · +47dVerified
Hawaii State AGbd_48ccff9e491e5a462024-03-18 · +48dVerified

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: HealthcarellmFinancial Servicesllm

Discovered: Jun 1, 2023
Breach occurred: May 27, 2023 – May 30, 2023
Undetected for: 5 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 1,186state-resident count only
Data types: Identity (basic)Government ID
Data elements: NameSocial Security numberDriver's licence numberFinancial account numberDate of birthHealth insurance IDMedical information
WA-stated cause: Unauthorized Access
WA-stated duration: lifecycle 1-99dexposure 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: 35 weeks(243 days from discovery to filing)
Compliance flags: WA AG >90d
Discovery-date grounding: AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

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 · this page

Montana State AG+55d

Washington State AG+55d

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/BreachA27751.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jan 30, 2024
Raw hash: 9922b70ae16e256417fdf91519af6226f915e6dfb0ba44c76ddc60bf432f2c98

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 >90d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com