Social EngineeringFinancial ServicesFinancePhishingStolen CredentialsCustomer Data InvolvedPIIIdentity (basic)LowContained

Grand Ridge National Bank

bd_252c662219203ad9 · schema v1 · pii pii-v1

Severity

Low

Discovered

Oct 3, 2022

Filed

Feb 14, 2023

To disclose

19 weeks

Affected

1state residents only

Confidence

65%

Full breach record for Grand Ridge National Bank →3 incidents on file

Grand Ridge National Bank notified Montana residents of unauthorized access to an employee's email account between Sept 28 and Oct 3, 2022. The breach likely exposed names and other PII from emails. No fraud reported. Bank offered 12 months of Experian credit monitoring.

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Incident timeline

undetected · 5 days

discovery → filing · 19 weeks / 134 days

Sep 28, 2022

Begins

Oct 3, 2022

Discovered

Feb 14, 2023

Filed

vs. sector median

+11 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed1 affectedView incident

Name: Grand Ridge National Bank
norm: grand ridge national bank

Name: Grand Ridge National Bank
norm: grand ridge national bank
Industry: Financial Servicesllm

Discovered: Oct 3, 2022
Breach occurred: Sep 28, 2022 – Oct 3, 2022
Undetected for: 5 daysoccurrence → discovery
Materiality determined: —
Notification sent: Feb 13, 2023
Affected individuals: 1state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email Collection
Threat actor: External
Regulator citations: notify applicable federal and state regulators, as necessary
Initial access: phishing_link

During the incident: Immediately took steps to secure the email account
Launched an investigation to determine the nature and scope of the activity
Undertook a comprehensive and time-intensive review of the involved emails
Offering twelve (12) months of complimentary access to credit monitoring services through Experian
Changes made: Offering twelve (12) months of complimentary access to credit monitoring services through Experian
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 19 weeks(134 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/Consumer-notification-letter-67.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Feb 14, 2023
Raw hash: 3c99e157002c4e0274338e4eeac2d90a321022224d0606c39be52ffa8428d937

Reporting entityGrand Ridge National Bank

Victim entityGrand Ridge National Bank

Incidentdiscovered Oct 3, 2022

Stated responseImmediately took steps to secure the email account

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov