Social EngineeringFinancial ServicesFinancePhishingStolen CredentialsCustomer Data InvolvedIdentity (basic)PIILowContained

Manhattan Bank

bd_371875775bc28962 · schema v1 · pii pii-v1

Severity

Low

Discovered

Jun 10, 2024

Filed

Nov 8, 2024

To disclose

22 weeks

Affected

93state residents only

Confidence

66%

Full breach record for Manhattan Bank →2 incidents on file

Manhattan Bank notified Montana residents of a data security incident discovered on June 10, 2024, involving suspicious activity on a single email account. The bank engaged forensic specialists and determined customer names and data elements were impacted. No evidence of misuse was found. The bank offered 12 months of Experian IdentityWorks.

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Incident timeline

discovery → filing · 22 weeks / 151 days

Jun 10, 2024

Discovered

Nov 8, 2024

Filed

vs. sector median

+13 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed93 affectedView incident

Name: Manhattan Bank
norm: manhattan bank

Name: Manhattan Bank
norm: manhattan bank
Industry: Financial Servicesllm

Discovered: Jun 10, 2024
Materiality determined: —
Notification sent: Jan 15, 2025
Affected individuals: 93state-resident count only
Data types: Identity (basic)PII
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid Accounts
Threat actor: ExternalFinancial
Initial access: phishing_link

During the incident: Implemented our incident response protocols
Began an internal investigation
Hired external computer forensic specialists
Changes made: Implemented and will continue to adopt additional safeguards and technical security measures to protect and monitor our systems
Offering a complimentary 12 month membership of Experian’s IdentityWorks
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 22 weeks(151 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/2025/01/Consumer-notification-letter-7.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 8, 2024
Raw hash: c5ebb4742441411375052a5b6664daf80a6fc0562022c88630fd38bb45ea6ec9

Reporting entityManhattan Bank

Victim entityManhattan Bank

Incidentdiscovered Jun 10, 2024

Stated responseImplemented our incident response protocols

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov