HackingFinancial ServicesFinanceCustomer Data InvolvedPIIIdentity (basic)LowContained

Great Plains State Bank

bd_a1f0277f73be677e · schema v1 · pii pii-v1

Severity

Low

Discovered

—

Filed

Feb 19, 2025

To disclose

—

Affected

Not disclosed

Linked

7 filings

Confidence

68%

Full breach record for Great Plains State Bank →3 incidents on file

Great Plains Bank Corporation notified consumers of a cybersecurity incident where unauthorized activity was detected in its IT systems. The investigation indicates personal information may have been accessed by an unauthorized party as early as November 2024. The bank took immediate protective actions, notified federal law enforcement, and engaged cybersecurity specialists. Affected individuals are offered credit monitoring and identity restoration services.

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Leak gap clock⏱ Leak >30d

⚠ no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.

Incident timeline

Nov 1, 2024

Begins

Feb 19, 2025

Filed

This filing is one of 7 about the same incident.View merged incident

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Siteakirabd_7cc0083ed1c871af2024-12-16 · +65dVerified by operator

Regulatory filings (5) · sorted by filing gap

Nebraska State AGbd_042c3865dc5c23772025-02-19Candidate
Indiana State AGbd_52460b6e57da1cf62025-02-19Verified
Maryland State AGbd_764fa9a67a26e3242025-02-19Verified
Massachusetts State AGbd_d8debe286ca17aca2025-02-19Verified

Show 1 more filing ↓

Maine State AGbd_dc876070b235c24f2025-02-19Verified

Name: Great Plains State Bank
norm: great plains state bank
Domain: gpbankok.com

Name: Great Plains State Bank
norm: great plains state bank
Domain: gpbankok.com
Industry: Financial Servicesllm

Discovered: —
Breach occurred: Nov 1, 2024
Materiality determined: —
Notification sent: Feb 19, 2025
Affected individuals: Not disclosed
Data types: PIIIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: Notified U.S. federal law enforcement

During the incident: Took protective actions to stop any unauthorized access
Notified U.S. federal law enforcement
Launched an investigation with the assistance of leading cybersecurity specialists
Offering a [Extra3]-month membership in the Experian IdentityWorks credit monitoring and identity restoration program
Changes made: Continue to evaluate and deploy the level of robust security protocols
Continuous monitoring
Staff training needed to prevent and defend against sophisticated cybersecurity threats
Source: Quoted from the filing itself, not independently verified.

Compliance flags: Leak >30d
Discovery-date grounding: no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 6 filings · 6 states

View merged incident ↗

Nebraska State AGFeb 19 · first

Indiana State AGFeb 19 · first

Maryland State AGFeb 19 · first

Massachusetts State AGFeb 19 · first

Maine State AGFeb 19 · first

Vermont State AGFeb 19 · first · this page

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/2025-02-19-great-plains-bank-data-breach-notice-consumers
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Feb 19, 2025
Raw hash: b2bfd0dea2d0b88f2357fe6bfe83358c8759bd14d3f6990349a0536065f8eda6

Linked disclosures

Ransomware claims (1)

Regulatory filings (5) · sorted by filing gap

Reporting entityGreat Plains State Bank

Victim entityGreat Plains State Bank

IncidentUnauthorized Access

Stated responseTook protective actions to stop any unauthorized access

ComplianceLeak >30d

Extraction provenanceno artifact recorded

Source provenanceago.vermont.gov