HackingFinancial ServicesFinanceVulnerability ExploitZero-DayData ExfiltratedCustomer Data InvolvedPIIIdentity (basic)Government IDMediumContained

DELTA DENTAL OF CALIFORNIA

bd_c3823867bfe6e8aa · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jun 1, 2023

Filed

Jul 12, 2023

To disclose

6 weeks

Affected

Not disclosed

Confidence

65%

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

Delta Dental of California disclosed a data security incident involving the MOVEit file-transfer software. Unauthorized actors exploited a vulnerability in the software between May 27 and May 30, 2023. The company discovered the incident on June 1, 2023, and confirmed unauthorized access to personal information on July 6, 2023. Notifications to affected individuals began on November 27, 2023. The breach involved identity and government-issued data. The company engaged forensic experts, notified law enforcement, and offered 24 months of credit monitoring.

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Incident timeline

undetected · 5 days

discovery → filing · 6 weeks / 41 days

May 27, 2023

Begins

Jun 1, 2023

Discovered

Jul 12, 2023

Filed

vs. sector median

3 wks faster

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

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 Servicesllm

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: Not disclosed
Data types: Identity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
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
Apply security patches for known vulnerabilities provided by third-party software vendors
Regularly update our capabilities to monitor potential security threats
Consistently manage access to our systems and data
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 6 weeks(41 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://attorneygeneral.delaware.gov/wp-content/uploads/sites/50/2024/03/Delta-Dental.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 12, 2023
Raw hash: 36c070593389396b3254d67d9266f4a20c937442c6734647ecfaa8ee148970de

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 provenanceattorneygeneral.delaware.gov