Social EngineeringFinancial ServicesFinancePhishingTargetedPIIIdentity (basic)LowContained

Prairie State Bank and Trust

bd_e9f341b7f788f8bb · schema v1 · pii pii-v1

Severity

Low

Discovered

May 25, 2021

Filed

Sep 3, 2021

To disclose

14 weeks

Affected

1state residents only

Linked

2 filings

Confidence

65%

Full breach record for Prairie State Bank and Trust →2 incidents on file

Prairie State Bank & Trust notified Montana residents of unauthorized access to a single employee's email account via a phishing campaign between May 24-25, 2021. The bank secured the account, engaged forensic investigators, and disabled ACH debit features. Personal information may have been viewed; SSN was not impacted.

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Incident timeline

undetected · 1 days

discovery → filing · 14 weeks / 101 days

May 24, 2021

Begins

May 25, 2021

Discovered

Sep 3, 2021

Filed

vs. sector median

+6 wks slower

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Massachusetts State AGbd_1a20d9da34c459842021-09-03Candidate

Name: Prairie State Bank and Trust
norm: prairie state bank and

Name: Prairie State Bank and Trust
norm: prairie state bank and
Industry: Financial Servicesllm

Discovered: May 25, 2021
Breach occurred: May 24, 2021 – May 25, 2021
Undetected for: 1 dayoccurrence → discovery
Materiality determined: —
Notification sent: Aug 20, 2021
Affected individuals: 1state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid Accounts
Threat actor: External
Initial access: phishing_link

During the incident: Secured the employee’s email account
Began an investigation with the assistance of an independent cybersecurity firm
Disabled the ACH Debit (Electronic 3rd Party Withdrawal) feature on the savings account(s)
Changes made: Enhance our existing security protocols
Re-educating our staff for awareness on these types of incidents
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 14 weeks(101 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Massachusetts State AGSep 3 · first

Montana State AGSep 3 · 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-1.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 3, 2021
Raw hash: 8255bb8c01058888f92731b251823d18df0a6f109216f7a65095523b9aa353cd

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityPrairie State Bank and Trust

Victim entityPrairie State Bank and Trust

Incidentdiscovered May 25, 2021

Stated responseSecured the employee’s email account

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov