HackingFinancial ServicesFinanceStolen CredentialsCustomer Data InvolvedIdentity (basic)Government IDFinancial accountMediumContained

American State Bank

bd_a96fb9884bd15b18 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jan 14, 2019

Filed

Mar 26, 2019

To disclose

10 weeks

Affected

4state residents only

Confidence

65%

Full breach record for American State Bank →

American State Bank notified Montana residents that unauthorized users accessed employee email mailboxes between Nov 23, 2018 and Jan 14, 2019. The incident exposed names, addresses, SSNs, debit card numbers, and account numbers. The bank engaged forensic investigators, isolated the threat, and offered 12 months of credit monitoring.

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Incident timeline

undetected · 52 days

discovery → filing · 10 weeks / 71 days

Nov 23, 2018

Begins

Jan 14, 2019

Discovered

Mar 26, 2019

Filed

vs. sector median

+1 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed4 affectedView incident

Name: American State Bank
norm: american state bank

Name: American State Bank
norm: american state bank
Industry: Financial Servicesllm

Discovered: Jan 14, 2019
Breach occurred: Nov 23, 2018 – Jan 14, 2019
Undetected for: 52 daysoccurrence → discovery
Materiality determined: —
Notification sent: Mar 26, 2019
Affected individuals: 4state-resident count only
Data types: Identity (basic)Government IDFinancial account
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1114 Email Collection
Threat actor: External
Initial access: valid_credentials

During the incident: Isolated and removed the unauthorized users
Contracted with an outside computer forensic company to monitor our email accounts for additional unauthorized access
Had our outside forensic company monitor our internal network and systems
Changes made: Offering twelve (12) months of credit monitoring at no cost
Providing new debit cards at no cost
Providing new account numbers at no charge
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 10 weeks(71 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/CON-Letter-1-SS-Debit-Card-DDA-01081897xB8DF0.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 26, 2019
Raw hash: 8a7ba1def09d8bbb9cc6bbc42ba46048a05dae1e5a84d3b49042cfd3553e907c

Reporting entityAmerican State Bank

Victim entityAmerican State Bank

Incidentdiscovered Jan 14, 2019

Stated responseIsolated and removed the unauthorized users

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov