Social EngineeringFinancial ServicesFinancePhishingStolen CredentialsCustomer Data InvolvedTargetedIdentity (basic)Government IDFinancial accountPHIHealth (basic)CredentialsMediumContained

First Security Bank

bd_8d04eff8000be1ce · schema v1 · pii pii-v1

Severity

Medium

Discovered

Mar 18, 2024

Filed

Sep 3, 2024

To disclose

24 weeks

Affected

1state residents only

Confidence

65%

Full breach record for First Security Bank →

First Security Bank notified Montana residents of a security incident involving unauthorized access to a specific email account between Feb 9 and Mar 18, 2024. The bank discovered the suspicious activity on Mar 18, 2024. Compromised data included names, account/routing numbers, DOB, and PHI. No evidence of misuse was found. The bank secured the account, notified law enforcement, and offered 12 months of credit monitoring.

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Incident timeline

undetected · 38 days

discovery → filing · 24 weeks / 169 days

Feb 9, 2024

Begins

Mar 18, 2024

Discovered

Sep 3, 2024

Filed

vs. sector median

+16 wks slower

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

Name: First Security Bank
norm: first security bank
Domain: firstsecurityks.com

Name: First Security Bank
norm: first security bank
Domain: firstsecurityks.com
Industry: Financial Servicesllm

Discovered: Mar 18, 2024
Breach occurred: Feb 9, 2024 – Mar 18, 2024
Undetected for: 38 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 3, 2024
Affected individuals: 1state-resident count only
Data types: Identity (basic)Government IDFinancial accountPHIHealth (basic)Credentials
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email Collection
Threat actor: ExternalFinancial
Regulator citations: reported this incident to federal law enforcement and are cooperating with their investigation
Initial access: phishing_link

During the incident: Secured the account by changing the password
Launched an investigation
Undertook a comprehensive review of the contents of the potentially impacted account
Reported this incident to federal law enforcement and are cooperating with their investigation
Offering you complimentary access to twelve (12) months of credit monitoring and identity theft restoration services, through TransUnion
Changes made: Policies and procedures regarding information security are being reviewed and enhanced
Additional training is being conducted to reduce the likelihood of a similar event in the future
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 24 weeks(169 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-1651.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 3, 2024
Raw hash: b82da7e405baf82d08049bc56dde05b82a66b16474fa60d0dbfacc91d412217f

Reporting entityFirst Security Bank

Victim entityFirst Security Bank

Incidentdiscovered Mar 18, 2024

Stated responseSecured the account by changing the password

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov