HackingFinancial ServicesFinanceStolen CredentialsTargetedPIIIdentity (basic)LowContained

WESTERRA CREDIT UNION

bd_c36cbef9364b1da1 · schema v1 · pii pii-v1

Severity

Low

Discovered

Sep 27, 2022

Filed

Feb 13, 2023

To disclose

20 weeks

Affected

2state residents only

Confidence

66%

Full breach record for WESTERRA CREDIT UNION →2 incidents on file

Westerra Credit Union notified Montana residents that an unauthorized party briefly accessed one email account on September 27, 2022. The account contained names and other personal information. No evidence of misuse was found. Westerra secured the account, engaged forensic investigators, and offered one year of Experian IdentityWorks.

J jump to incidentP pin to compareR raw source

Incident timeline

discovery → filing · 20 weeks / 139 days

Sep 27, 2022

Begins

Sep 27, 2022

Discovered

Feb 13, 2023

Filed

vs. sector median

+12 wks slower

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

Name: WESTERRA CREDIT UNION
norm: westerra credit union

Name: WESTERRA CREDIT UNION
norm: westerra credit union
Industry: Financial Servicesllm

Discovered: Sep 27, 2022
Breach occurred: Sep 27, 2022
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 2state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Initial access: valid_credentials

During the incident: Secured the email account
Began an internal investigation
Engaged a forensic security firm to investigate and confirm the security of our email and computer systems
Offering a complimentary one-year membership of Experian IdentityWorksSM Credit 3B
Changes made: Enhancing our technical security measures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 20 weeks(139 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-65.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Feb 13, 2023
Raw hash: 255edf12fcfc6fd7491136888eacee2c0a994f21488a4af3c1c7949e68551f80

Reporting entityWESTERRA CREDIT UNION

Victim entityWESTERRA CREDIT UNION

Incidentdiscovered Sep 27, 2022

Stated responseSecured the email account

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov