HackingFinancial ServicesFinanceStolen CredentialsData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDFinancial accountMediumContained

Marine Bank & Trust Company

bd_82c2de8f413914d2 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Mar 15, 2021

Filed

Sep 9, 2021

To disclose

25 weeks

Affected

3state residents only

Linked

5 filings

Confidence

65%

Full breach record for Marine Bank & Trust Company →

Marine Bank & Trust notified Montana residents of unauthorized network access occurring Feb 28–Mar 6, 2021, detected Mar 15, 2021. Data potentially exposed included names, SSNs, driver’s license numbers, and financial account numbers. The bank engaged outside cybersecurity professionals, contained the threat, and offered one year of Experian IdentityWorks credit monitoring.

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Incident timeline

undetected · 15 days

discovery → filing · 25 weeks / 178 days

Feb 28, 2021

Begins

Mar 15, 2021

Discovered

Sep 9, 2021

Filed

vs. sector median

+17 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

Maine State AGbd_36f3d4fd62d3f6542021-09-09Candidate
Massachusetts State AGbd_fee15b723acd0b492021-09-09Verified
Indiana State AGbd_388ff8944d82be582021-09-08 · +1dVerified
New Hampshire State AGbd_0742ce958bba8aba2021-09-13 · +4dVerified

Name: Marine Bank & Trust Company
norm: marine bank

Name: Marine Bank & Trust Company
norm: marine bank
Industry: Financial Servicesllm

Discovered: Mar 15, 2021
Breach occurred: Feb 28, 2021 – Mar 6, 2021
Undetected for: 15 daysoccurrence → discovery
Materiality determined: —
Notification sent: Aug 24, 2021
Affected individuals: 3state-resident count only
Data types: Identity (basic)Government IDFinancial account
Data elements: Social Security number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Initial access: valid_credentials

During the incident: Contained and secured the threat
Commenced a prompt and thorough investigation
Launched an investigation in consultation with outside cybersecurity professionals
Offering a complimentary one-year membership of Experian IdentityWorksSM Credit 3B
Changes made: Continually evaluate and modify our practices and internal controls to enhance the security and privacy of your personal information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 25 weeks(178 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 ↗

Indiana State AGSep 8 · first

Maine State AG+1d

Massachusetts State AG+1d

Montana State AG+1d · this page

New Hampshire State AG+5d

Pattern: first filing Sep 8 (IN), last Sep 13 (NH) — a 5-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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-6.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 9, 2021
Raw hash: 14ca61df7f07176d0e9cda86a64a6840e3250e4ad550814f2e4ba6fb7c0c364d

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityMarine Bank & Trust Company

Victim entityMarine Bank & Trust Company

Incidentdiscovered Mar 15, 2021

Stated responseContained and secured the threat

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov