HackingFinancial ServicesFinanceStolen CredentialsTargetedPIIIdentity (basic)LowContained

Midwest Bank

bd_3eebb4bb547d4355 · schema v1 · pii pii-v1

Severity

Low

Discovered

—

Filed

Sep 28, 2023

To disclose

—

Affected

10state residents only

Linked

2 filings

Confidence

66%

Full breach record for Midwest Bank →

Midwest Bank notified Montana residents of a data breach where an unauthorized party accessed an employee's email account between May 30 and June 6, 2023. The incident may have exposed names and other personal information. The bank secured the account, engaged Kroll for one year of complimentary identity monitoring, and enhanced technical safeguards.

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Incident timeline

May 30, 2023

Begins

Sep 28, 2023

Filed

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Massachusetts State AGbd_05b7db6c1e40cdac2023-09-28Verified

Name: Midwest Bank
norm: midwest bank

Name: Midwest Bank
norm: midwest bank
Industry: Financial Servicesllm

Discovered: —
Breach occurred: May 30, 2023 – Jun 6, 2023
Materiality determined: —
Notification sent: —
Affected individuals: 10state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Initial access: valid_credentials

During the incident: Secured the employee’s email account
Launched an investigation
Enhanced our technical safeguards
Secured the services of Kroll to offer you a complimentary identity monitoring services for one year
Changes made: Enhanced our technical safeguards
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.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Massachusetts State AGSep 28 · first

Montana State AGSep 28 · first · this page

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-726.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 28, 2023
Raw hash: b61cc728160d9679735d25dea923deb61fb08f615c6986bcc5d748c291d2d4ec

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityMidwest Bank

Victim entityMidwest Bank

IncidentUnauthorized Access

Stated responseSecured the employee’s email account

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov