HackingFinancial ServicesFinanceVulnerability ExploitSupply Chain (3P Vendor)Data ExfiltratedTargetedIdentity (basic)Government IDFinancial accountMediumContained

Bank OZK

bd_f5d627cc21f70e14 · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 31, 2023

Filed

Aug 4, 2023

To disclose

9 weeks

Affected

4state residents only

Linked

2 filings

Confidence

66%

Full breach record for Bank OZK →

Bank OZK notified Montana residents of a data security incident involving a third-party business partner's use of Progress Software's MOVEit transfer tool. An unauthorized third party exploited a vulnerability in MOVEit on or around May 31, 2023, potentially accessing files containing customer names, DOBs, SSNs, and account numbers. Bank OZK offered 24 months of identity monitoring via ChexSystems.

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Incident timeline

discovery → filing · 9 weeks / 65 days

May 31, 2023

Begins

May 31, 2023

Discovered

Aug 4, 2023

Filed

vs. sector median

on median

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Massachusetts State AGbd_95287aad195cb6982023-08-07 · +3dVerified

Name: Bank OZK
norm: bank ozk

Name: Bank OZK
norm: bank ozk
Industry: Financial Servicesllm

Discovered: May 31, 2023
Breach occurred: May 31, 2023
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Aug 7, 2023
Affected individuals: 4state-resident count only
Data types: Identity (basic)Government IDFinancial account
Data elements: Social Security numberDate of birth
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Third party: via Progress Software (MOVEit provider) / Business Partner
Initial access: exploit_public_facing

During the incident: Business partner immediately suspended use of the MOVEit Transfer tool
Business partner received and implemented a software patch to remediate the issue
Business partner launched an immediate investigation working alongside cyber experts and law enforcement
Bank OZK conducted a manual review of records to confirm identities of affected individuals
Offering complimentary membership to OnAlert from ChexSystems
Changes made: Implemented software patch for MOVEit Transfer tool
Assessed security of systems
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 9 weeks(65 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Montana State AGAug 4 · first · this page

Massachusetts State AG+3d

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-1-1.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 4, 2023
Raw hash: 0f19c82b0b8406c6e3f0a34ea65a361d9e2ff8b6cfd4f223561b9cb266570d7c

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityBank OZK

Victim entityBank OZK

Incidentdiscovered May 31, 2023

Stated responseBusiness partner immediately suspended use of the MOVEit Transfer tool

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov