HackingFinancial ServicesFinanceVulnerability ExploitData ExfiltratedData EncryptedCustomer Data InvolvedDelayed DiscoveryIdentity (basic)Government IDMediumContained

Arch Capital Services LLC

bd_3123a62f59c7451e · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

Jan 25, 2024

To disclose

—

Affected

Not disclosed

Linked

4 filings

Confidence

69%

Full breach record for Arch Capital Services LLC →

Arch Capital Services filed notice with the Vermont Attorney General of a data security incident at Delta Dental of California and affiliates involving Progress Software's MOVEit Transfer application. Unauthorized actors exploited a vulnerability in the software between May 27-30, 2023. Delta Dental learned of the incident on June 1, 2023, and confirmed unauthorized access on July 6, 2023. Delta Dental engaged forensic experts, patched the system, reset passwords, and offered 24 months of free identity monitoring via Kroll.

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Incident timeline

May 27, 2023

Begins

Jan 25, 2024

Filed

This filing is one of 4 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

Indiana State AGbd_a73e419a4c0a813f2024-01-25Verified
Maine State AGbd_c90222998803b42a2024-02-05 · +11dVerified
Massachusetts State AGbd_3b5b8a157105bcd02024-02-06 · +12dVerified

Name: Delta Dental of California and affiliates
norm: delta dental of california

Name: Arch Capital Services LLC
norm: arch
Industry: Financial Servicesllm

Discovered: —
Breach occurred: May 27, 2023 – May 30, 2023
Materiality determined: —
Notification sent: —
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
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 capabilities to monitor potential security threats
Consistently manage access to systems and data
Source: Quoted from the filing itself, not independently verified.

Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

Indiana State AGJan 25 · first

Vermont State AGJan 25 · first · this page

Maine State AG+11d

Massachusetts State AG+12d

Pattern: first filing Jan 25 (IN), last Feb 6 (MA) — a 12-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://ago.vermont.gov/document/2024-01-25-arch-capital-services-progress-software-moveit-data-breach-notice-consumers
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jan 25, 2024
Raw hash: ec3427676a52d5ae2889a9db5ae0d8ded621d12bfb3b70b3727e7d905eaca621

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityDelta Dental of California and affiliates

Victim entityArch Capital Services LLC

IncidentUnauthorized Access

Stated responseStopped access to the MOVEit software

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceago.vermont.gov