MalwareFinancial ServicesFinanceRansomwareData ExfiltratedRansom DemandedData EncryptedTargetedIdentity (basic)Government IDHighContained

Great Plains State Bank

bd_dc876070b235c24f · schema v1 · pii pii-v1

Severity

High

Discovered

Jan 6, 2025

Filed

Feb 19, 2025

To disclose

6 weeks

Affected · nationwide

7,7671 in this filing

Linked

7 filings

Confidence

66%

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

Great Plains Bank Corporation reported a ransomware attack occurring on November 21, 2024, discovered on January 6, 2025. The incident affected 7,767 individuals nationwide, including 1 Maine resident. Personal information compromised included names and Social Security numbers. The bank notified law enforcement (FBI), engaged cybersecurity specialists, and provided one year of credit monitoring via Experian. Notices were sent on February 19, 2025.

J jump to incidentP pin to compareR raw source

Maine clockDiscovered Jan 6, 2025 → Filed with AG Feb 19, 202544d ⏱ ME AG >30d6 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 · 46 days

discovery → filing · 6 weeks / 44 days

Nov 21, 2024

Begins

Jan 6, 2025

Discovered

Feb 19, 2025

Filed

vs. sector median

2 wks faster

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

A leak claim by akira about this victim predates this filing by 65 days.View originating leak claim

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
Vermont State AGbd_a1f0277f73be677e2025-02-19Verified

Show 1 more filing ↓

Massachusetts State AGbd_d8debe286ca17aca2025-02-19Verified

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

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

Discovered: Jan 6, 2025
Breach occurred: Nov 21, 2024
Undetected for: 46 daysoccurrence → discovery
Materiality determined: —
Notification sent: Feb 19, 2025
Affected individuals: 7,767state + nationwide
Data types: Identity (basic)Government ID
Data elements: Social Security number
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1078 Valid Accounts
Threat actor: ExternalFinancial
Regulator citations: Notified U.S. federal law enforcementNotified the Federal Bureau of Investigation (FBI)

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
Notified the Federal Bureau of Investigation (FBI)
Installed monitoring devices to detect any suspicious activity
Providing one (1) year of complimentary credit protection and monitoring services through Experian
Changes made: Implementing additional safeguards
Retained industry-leading cybersecurity specialists
Deploying continuous monitoring and staff training
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 6 weeks(44 days from discovery to filing)
Compliance flags: ME AG >30d · 44dLeak >30d
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.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Jan 6, 2025
→ Filed with AG: Feb 19, 2025
44d 30 days (soft) ME AG >30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Jan 6, 2025 → Filed with AG: Feb 19, 2025	44d	30 days (soft)	ME AG >30d

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

Vermont State AGFeb 19 · first

Massachusetts State AGFeb 19 · first

Maine 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://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/2c82f29f-8ded-4cce-80bc-d2eaaf6d799b.html
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: 3b7c70e2adf8d9658180b01dfcad6dc8f33287eb68cb0facb9d5c80cfb71fcbe

Linked disclosures

Ransomware claims (1)

Regulatory filings (5) · sorted by filing gap

Reporting entityGreat Plains State Bank

Victim entityGreat Plains State Bank

Incidentdiscovered Jan 6, 2025

Stated responseTook protective actions to stop any unauthorized access

ComplianceME AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov