HackingFinancial ServicesFinanceStolen CredentialsData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDMediumContained

Goose River Bank

bd_62c370e5c15777e4 · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 21, 2021

Filed

Aug 27, 2021

To disclose

14 weeks

Affected

35state residents only

Confidence

66%

Full breach record for Goose River Bank →

Goose River Bank notified Montana residents of a May 21, 2021 data breach where an unauthorized third party accessed systems and copied files containing names, dates of birth, and driver's license images. The bank secured systems within 24 hours, engaged forensic investigators, and offered one year of Experian IdentityWorks credit monitoring.

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Incident timeline

discovery → filing · 14 weeks / 98 days

May 21, 2021

Begins

May 21, 2021

Discovered

Aug 27, 2021

Filed

vs. sector median

+6 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed35 affectedView incident

Name: Goose River Bank
norm: goose river bank

Name: Goose River Bank
norm: goose river bank
Industry: Financial Servicesllm

Discovered: May 21, 2021
Breach occurred: May 21, 2021 – May 21, 2021
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 35state-resident count only
Data types: Identity (basic)Government ID
Data elements: Date of birth
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Initial access: valid_credentials

During the incident: Engaged a forensic security firm to investigate
Secured our systems within 24 hours
Offering a complimentary one-year membership of Experian IdentityWorksSM Credit 3B
Changes made: Enhancing our technical security measures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 14 weeks(98 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/notificationLetter-85.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 27, 2021
Raw hash: ee5d9f57afec00659303720b11b63e041471298b067fde702ac873ac27fc318a

Reporting entityGoose River Bank

Victim entityGoose River Bank

Incidentdiscovered May 21, 2021

Stated responseEngaged a forensic security firm to investigate

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov