Social EngineeringFinancial ServicesFinancePhishingStolen CredentialsCustomer Data InvolvedPIIIdentity (basic)LowContained

First State Bank of Bigfork

bd_0d06c881dab776cb · schema v1 · pii pii-v1

Severity

Low

Discovered

Jan 11, 2023

Filed

May 30, 2023

To disclose

20 weeks

Affected

1state residents only

Confidence

65%

First State Bank of Bigfork notified Montana residents that an unauthorized third party accessed employee email accounts between Jan 9-11, 2023, likely via phishing. Personal information was contained in the accounts. The bank secured accounts, engaged forensic investigators, and offered one year of Experian IdentityWorks.

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Incident timeline

undetected · 2 days

discovery → filing · 20 weeks / 139 days

Jan 9, 2023

Begins

Jan 11, 2023

Discovered

May 30, 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: First State Bank of Bigfork
norm: first state bank of bigfork

Name: First State Bank of Bigfork
norm: first state bank of bigfork
Industry: Financial Servicesllm

Discovered: Jan 11, 2023
Breach occurred: Jan 9, 2023 – Jan 11, 2023
Undetected for: 2 daysoccurrence → discovery
Materiality determined: —
Notification sent: May 30, 2023
Affected individuals: 1state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid Accounts
Threat actor: External
Initial access: phishing_link

During the incident: Secured the email accounts to prevent further unauthorized access
Began an internal investigation
Engaged a forensic security firm to investigate and confirm the security of our email and computer systems
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: 20 weeks(139 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-322.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 30, 2023
Raw hash: 04df198db1fe9684ac9dab9f5ecedeaec0aa790d29350af07aabaf558a6afbf5

Reporting entityFirst State Bank of Bigfork

Victim entityFirst State Bank of Bigfork

Incidentdiscovered Jan 11, 2023

Stated responseSecured the email accounts to prevent further unauthorized access

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov