UnknownFinancial ServicesFinanceCustomer Data InvolvedIdentity (basic)Government IDFinancial accountPIIMediumContained

Great Plains State Bank

bd_6f037589ed812f04 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Feb 24, 2020

Filed

Mar 25, 2020

To disclose

4 weeks

Affected

4state residents only

Confidence

64%

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

Great Plains State Bank notified Montana residents of a data security incident confirmed on February 24, 2020. The incident involved personal information including SSNs, DOBs, driver's licenses, and credit card numbers. The bank engaged forensic investigators and offered one year of Experian IdentityWorks. No fraud was known at the time of notice.

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Incident timeline

discovery → filing · 4 weeks / 30 days

Feb 24, 2020

Discovered

Mar 25, 2020

Filed

vs. sector median

4 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed4 affectedView incident

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: Feb 24, 2020
Materiality determined: —
Notification sent: —
Affected individuals: 4state-resident count only
Data types: Identity (basic)Government IDFinancial accountPII
Data elements: Social Security numberDate of birth
Attack vector: Unknown

During the incident: Engaged a forensic security firm to investigate and confirm the security of our systems
Offering a complimentary one-year membership of Experian IdentityWorks SM Credit 3B
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 4 weeks(30 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

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/General-Notice-72.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 25, 2020
Raw hash: 3db3a7767b2b0f675f365e60f1ca63c3b27b6a0b65df8380ad3439cde7da6d9d

Reporting entityGreat Plains State Bank

Victim entityGreat Plains State Bank

Incidentdiscovered Feb 24, 2020

Stated responseEngaged a forensic security firm to investigate and confirm the security of our systems

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov