HackingFinancial ServicesFinanceStolen CredentialsCustomer Data InvolvedTargetedIdentity (basic)Financial accountLowContained

Heartland Bank

bd_35a2394732e77a6e · schema v1 · pii pii-v1

Severity

Low

Discovered

Nov 9, 2024

Filed

Feb 7, 2025

To disclose

13 weeks

Affected

6state residents only

Linked

5 filings

Confidence

64%

Full breach record for Heartland Bank →

Heartland Bank notified Montana residents of an email security incident where an unauthorized person accessed employee accounts between Oct 31 and Nov 9, 2024. The actor viewed messages containing customer names and financial account numbers. No funds were transferred.

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Incident timeline

undetected · 9 days

discovery → filing · 13 weeks / 90 days

Oct 31, 2024

Begins

Nov 9, 2024

Discovered

Feb 7, 2025

Filed

vs. sector median

+5 wks slower

This filing is one of 5 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

Maryland State AGbd_0eb78e39a1ffe3d92025-02-07Verified
New Hampshire State AGbd_16d76fb514a535472025-02-07Verified
Massachusetts State AGbd_380ab6533a2bbee72025-02-07Verified
Nebraska State AGbd_c9907a9c43ec29cb2025-02-07Verified

Name: Heartland Bank
norm: heartland bank

Name: Heartland Bank
norm: heartland bank
Industry: Financial Servicesllm

Discovered: Nov 9, 2024
Breach occurred: Oct 31, 2024 – Nov 9, 2024
Undetected for: 9 daysoccurrence → discovery
Materiality determined: —
Notification sent: Feb 7, 2025
Affected individuals: 6state-resident count only
Data types: Identity (basic)Financial account
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Initial access: valid_credentials

During the incident: Took steps to secure the email accounts
Began our investigation
Reviewed the messages and attachments that the unauthorized actor interacted with
Changes made: Take steps to enhance the security of our email environment
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 13 weeks(90 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 5 states

View merged incident ↗

Maryland State AGFeb 7 · first

New Hampshire State AGFeb 7 · first

Massachusetts State AGFeb 7 · first

Nebraska State AGFeb 7 · first

Montana State AGFeb 7 · 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/2025/03/Consumer-notification-letter-189.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Feb 7, 2025
Raw hash: a891784b56da39b4fa8d7ad409579bc1385c056fcd2b6353262737397b3f5826

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityHeartland Bank

Victim entityHeartland Bank

Incidentdiscovered Nov 9, 2024

Stated responseTook steps to secure the email accounts

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov