Social EngineeringFinancial ServicesFinancePhishingStolen CredentialsCustomer Data InvolvedTargetedIdentity (basic)Government IDFinancial accountMediumContained

HCN Bank

bd_c890218f7c059598 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Mar 19, 2024

Filed

Jun 4, 2024

To disclose

11 weeks

Affected

2state residents only

Confidence

66%

Full breach record for HCN Bank →

HCN Bank notified Montana residents of a data breach where an unauthorized party accessed a single employee's email account starting March 5, 2024, after suspicious activity was detected on March 19, 2024. The incident involved customer names, addresses, account numbers, and SSNs. The bank contained the incident, enhanced monitoring, and offered one year of credit monitoring via Experian.

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Incident timeline

undetected · 14 days

discovery → filing · 11 weeks / 77 days

Mar 5, 2024

Begins

Mar 19, 2024

Discovered

Jun 4, 2024

Filed

vs. sector median

+3 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed2 affectedView incident

Name: HCN Bank
norm: hcn bank

Name: HCN Bank
norm: hcn bank
Industry: Financial Servicesllm

Discovered: Mar 19, 2024
Breach occurred: Mar 5, 2024
Undetected for: 14 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 4, 2024
Affected individuals: 2state-resident count only
Data types: Identity (basic)Government IDFinancial account
Data elements: Social Security number
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email Collection
Threat actor: ExternalFinancial
Regulator citations: Notice has not been delayed by law enforcement
Initial access: phishing_link

During the incident: Temporarily shut down specific systems
Launched an investigation
Confirmed how the access occurred
Put in place additional safeguards
Implemented enhanced account monitoring
Arranged with Experian to provide credit monitoring and identity protection services for one year
Changes made: Implemented enhanced account monitoring by placing more stringent criteria to alert us to unusual activities
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 11 weeks(77 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/Consumer-notification-letter-1449.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 4, 2024
Raw hash: d007289eebab1592ebb5584b3994a0bc983befc2e76aa9675727005df388bc62

Reporting entityHCN Bank

Victim entityHCN Bank

Incidentdiscovered Mar 19, 2024

Stated responseTemporarily shut down specific systems

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov