Social EngineeringFinancial ServicesFinancePhishingBECCustomer Data InvolvedTargetedIdentity (basic)Government IDMediumActive

First Interstate Bank

bd_e62791e550242982 · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

Aug 28, 2023

To disclose

—

Affected

3state residents only

Confidence

67%

Full breach record for First Interstate Bank →

First Interstate Bank notified customers of a business email compromise where a fraudster accessed a secured email sent to Matco Acoustics. The email contained sensitive signature card information including names, addresses, phone numbers, and Social Security numbers. No unauthorized use was known at the time of notification. Credit monitoring was offered.

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Incident timeline — partial

? — ?

Breach window unknown

Aug 28, 2023

Filed

No interval is drawn: no breach start or discovery date is on record for this filing.

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed3 affectedView incident

Name: First Interstate Bank
norm: first interstate bank
Domain: firstinterstatebank.com

Name: First Interstate Bank
norm: first interstate bank
Domain: firstinterstatebank.com
Industry: Financial Servicesllm

Discovered: —
Materiality determined: —
Notification sent: —
Affected individuals: 3state-resident count only
Data types: Identity (basic)Government ID
Data elements: Social Security number
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email Collection
Threat actor: ExternalFinancial
Initial access: phishing_link

During the incident: Offering one free year of credit monitoring service to each of the signers on your account
Source: Quoted from the filing itself, not independently verified.

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-608.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 28, 2023
Raw hash: 7df234919ae3f54bc3a5bccef9f6a49042b11eb6dffa8e5e73c862578e8e16e7

Reporting entityFirst Interstate Bank

Victim entityFirst Interstate Bank

IncidentPhishing

Stated responseOffering one free year of credit monitoring service to each of the signers on your account

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov