MalwareFinancial ServicesFinanceRansomwareData EncryptedCustomer Data InvolvedIdentity (basic)Government IDMediumContained

Great Plains State Bank

bd_764fa9a67a26e324 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Nov 21, 2024

Filed

Feb 19, 2025

To disclose

13 weeks

Affected

10state residents only

Linked

7 filings

Confidence

66%

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

Great Plains Bank Corporation experienced a ransomware attack on or around November 21, 2024, affecting its network and IT systems. The incident potentially exposed the names and Social Security numbers of 10 Maryland residents. The bank contained the unauthorized access, notified the FBI, and engaged cybersecurity specialists. Affected individuals were notified on February 19, 2025, and offered one year of complimentary credit monitoring through Experian.

J jump to incidentP pin to compareR raw source

Maryland clock⏱ MD AG >30d13 weeks discovery → filing

Incident timeline

discovery → filing · 13 weeks / 90 days

Nov 21, 2024

Begins

Nov 21, 2024

Discovered

Feb 19, 2025

Filed

vs. sector median

+5 wks slower

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
Vermont State AGbd_a1f0277f73be677e2025-02-19Verified
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: Nov 21, 2024
Breach occurred: Nov 21, 2024
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Feb 19, 2025
Affected individuals: 10state-resident count only
Data types: Identity (basic)Government ID
Data elements: Social Security number
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for Impact
Threat actor: ExternalFinancial
Regulator citations: notified U.S. federal law enforcementnotified law enforcement, including 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 law enforcement, including the Federal Bureau of Investigation ("FBI")
Installed monitoring devices to detect any suspicious activity
Changes made: Working to implement additional safeguards
Providing the potentially affected individuals one (1) year of complimentary credit protection and monitoring services through Experian at no cost to the individuals
Continue to evaluate and deploy the level of robust security protocols, continuous monitoring, and staff training needed to prevent and defend against sophisticated cybersecurity threats
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 13 weeks(90 days from discovery to filing)
Compliance flags: MD AG >30dLeak >30d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

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

Vermont State AGFeb 19 · first

Massachusetts State AGFeb 19 · first

Maine State AGFeb 19 · first

Maryland 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://oag.maryland.gov/resources-info/SBN%20Documents/2025/ITU-376381.pdf
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: a919dc4bb51020b364630ad89f312326ed3a600743059cc3aef931814df4f6bb

Linked disclosures

Ransomware claims (1)

Regulatory filings (5) · sorted by filing gap

Reporting entityGreat Plains State Bank

Victim entityGreat Plains State Bank

Incidentdiscovered Nov 21, 2024

Stated responseTook protective actions to stop any unauthorized access

ComplianceMD AG >30d

Extraction provenanceno artifact recorded

Source provenanceoag.maryland.gov