MisuseFinancial ServicesFinancePrivilege AbuseEmployee Data InvolvedTargetedIdentity (basic)Government IDFinancial accountMediumContained

The Huntington National Bank/ TCF National Bank

bd_3b634da95b8b8c76 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jul 7, 2021

Filed

Aug 11, 2021

To disclose

5 weeks

Affected

1state residents only

Confidence

66%

Full breach record for The Huntington National Bank/ TCF National Bank →

The Huntington National Bank notified Montana residents of a data breach involving TCF National Bank customer data. A former TCF employee with authorized access misused customer information between November 2020 and April 2021. Affected data included names, addresses, SSNs, driver's license numbers, and account numbers. The bank engaged law enforcement and provided two years of credit monitoring.

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Incident timeline

undetected · 248 days

discovery → filing · 5 weeks / 35 days

Nov 1, 2020

Begins

Jul 7, 2021

Discovered

Aug 11, 2021

Filed

vs. sector median

3 wks faster

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

Name: The Huntington National Bank/ TCF National Bank
norm: the huntington national bank tcf national bank

Name: The Huntington National Bank/ TCF National Bank
norm: the huntington national bank tcf national bank
Industry: Financial Servicesllm

Discovered: Jul 7, 2021
Breach occurred: Nov 1, 2020 – Apr 30, 2021
Undetected for: 248 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 1state-resident count only
Data types: Identity (basic)Government IDFinancial account
Data elements: Social Security numberDate of birth
Attack vector: Insider
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: Internal
Regulator citations: Contacted law enforcement
Initial access: insider_action

During the incident: Began investigating the incident as soon as we learned of it
Contacted law enforcement with respect to this matter
Arranged for you, at your option, to enroll in a complimentary two-year credit monitoring service
Engaged Equifax to provide you with Equifax Complete Premier services
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(35 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/notificationLetter-38.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 11, 2021
Raw hash: fc3ddb336ad6aa1f37ff2a21617b6287468e6d6b940d07c8761fbd841abdd5df

Reporting entityThe Huntington National Bank/ TCF National Bank

Victim entityThe Huntington National Bank/ TCF National Bank

Incidentdiscovered Jul 7, 2021

Stated responseBegan investigating the incident as soon as we learned of it

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov