Social EngineeringFinancial ServicesFinancePhishingStolen CredentialsCustomer Data InvolvedTargetedPIIIdentity (basic)LowContained

First National Bank of Michigan

bd_05051d00608d740a · schema v1 · pii pii-v1

Severity

Low

Discovered

Dec 13, 2023

Filed

Apr 24, 2024

To disclose

19 weeks

Affected

2state residents only

Linked

4 filings

Confidence

66%

Full breach record for First National Bank of Michigan →

First National Bank of Michigan notified Montana residents of a security incident involving unauthorized access to an employee email account between Dec 11-13, 2023. The attacker accessed files containing customer PII. FNBM investigated, enhanced email security, and is providing employee training.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 2 days

discovery → filing · 19 weeks / 133 days

Dec 11, 2023

Begins

Dec 13, 2023

Discovered

Apr 24, 2024

Filed

vs. sector median

+11 wks slower

This filing is one of 4 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

New Hampshire State AGbd_82383152cd83268d2024-04-24Verified
Indiana State AGbd_a4ef98982a8e27b12024-04-24Verified
Massachusetts State AGbd_bffb7e42a98cc2cf2024-04-24Verified

Name: First National Bank of Michigan
norm: first national bank of michigan

Name: First National Bank of Michigan
norm: first national bank of michigan
Industry: Financial Servicesllm

Discovered: Dec 13, 2023
Breach occurred: Dec 11, 2023 – Dec 13, 2023
Undetected for: 2 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 2state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email Collection
Threat actor: ExternalFinancial
Initial access: phishing_link

During the incident: Conducted an investigation
Implemented additional security measures to enhance the security of our email environment
Will continue to train our employees concerning data security
Changes made: Implemented additional security measures to enhance the security of our email environment
Will continue to train our employees concerning data security
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 19 weeks(133 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

New Hampshire State AGApr 24 · first

Indiana State AGApr 24 · first

Massachusetts State AGApr 24 · first

Montana State AGApr 24 · first · this page

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-1302.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 24, 2024
Raw hash: 4eb9da6333969ffadf2e2b499c40a7ad8297bf5351b8aadc405976ddca5ead07

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityFirst National Bank of Michigan

Victim entityFirst National Bank of Michigan

Incidentdiscovered Dec 13, 2023

Stated responseConducted an investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov