HackingFinancial ServicesFinanceStolen CredentialsCustomer Data InvolvedIdentity (basic)Government IDFinancial accountMediumContained

U.S. Bank, N.A.

bd_9d92fbe19408e83a · schema v1 · pii pii-v1

Severity

Medium

Discovered

Mar 31, 2021

Filed

May 5, 2021

To disclose

5 weeks

Affected · nationwide

3332 in this filing

Confidence

66%

U.S. Bank, N.A. reported a credential stuffing incident on March 31, 2021, affecting 333 individuals, including 2 Maine residents. The breach involved financial account numbers and credit/debit card details. The bank notified affected consumers via telephone on April 2, 2021.

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Maine clockDiscovered Mar 31, 2021 → Filed with AG May 5, 202135d ⏱ ME AG >30d5 weeks discovery → filing

⚠ occurrence dateThe stored discovery date equals the breach OCCURRENCE date. Detection is normally later, so this OVERSTATES the delay — a 'late' verdict here may not be real.

Incident timeline

discovery → filing · 5 weeks / 35 days

Mar 31, 2021

Begins

Mar 31, 2021

Discovered

May 5, 2021

Filed

vs. sector median

3 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed333 affectedView incident

Name: U.S. Bank, N.A.
norm: u.s. bank
Domain: usbank.com

Name: U.S. Bank, N.A.
norm: u.s. bank
Domain: usbank.com
Industry: Financial Servicesllm

Discovered: Mar 31, 2021
Breach occurred: Mar 31, 2021
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Apr 2, 2021
Affected individuals: 333state + nationwide
Data types: Identity (basic)Government IDFinancial account
Data elements: Financial account number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1110 Brute Force
Threat actor: ExternalFinancial
Regulator citations: Filed data breach notice with Maine Attorney General
Initial access: valid_credentials

During the incident: Sent notification to affected consumers via telephone
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(35 days from discovery to filing)
Compliance flags: ME AG >30d · 35d
Discovery-date grounding: occurrence dateThe stored discovery date equals the breach OCCURRENCE date. Detection is normally later, so this OVERSTATES the delay — a 'late' verdict here may not be real.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Mar 31, 2021
→ Filed with AG: May 5, 2021
35d 30 days (soft) ME AG >30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Mar 31, 2021 → Filed with AG: May 5, 2021	35d	30 days (soft)	ME AG >30d

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://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/22155baf-9322-4cc4-b243-7fa4704925d0.shtml
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 5, 2021
Raw hash: 8d78950e6cd50bf1e3686e7ab213ee3870f73a45316bbd3ba71527f6c9f902de

Reporting entityU.S. Bank, N.A.

Victim entityU.S. Bank, N.A.

Incidentdiscovered Mar 31, 2021

Stated responseSent notification to affected consumers via telephone

ComplianceME AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov