HackingOtherStolen CredentialsCustomer Data InvolvedIdentity (basic)Government IDMediumContained

Thunderbird Country Club

bd_ad4f5b013ed5c4c3 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Mar 28, 2024

Filed

Apr 11, 2024

To disclose

14 days

Affected

1state residents only

Confidence

64%

Full breach record for Thunderbird Country Club →3 incidents on file

Thunderbird Country Club, LLC notified Montana residents of a data breach occurring on March 28, 2024, involving unauthorized access to personal information including names, addresses, and Social Security numbers. The company engaged forensic investigators, secured the network, and offered 12 months of credit monitoring services.

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Incident timeline

discovery → filing · 14 days

Mar 28, 2024

Begins

Mar 28, 2024

Discovered

Apr 11, 2024

Filed

vs. sector median

6 wks faster

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

Name: Thunderbird Country Club
norm: thunderbird country club
Domain: thunderbirdcc.org

Name: Thunderbird Country Club
norm: thunderbird country club
Domain: thunderbirdcc.org
Industry: Otherllm

Discovered: Mar 28, 2024
Breach occurred: Mar 28, 2024
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Apr 11, 2024
Affected individuals: 1state-resident count only
Data types: Identity (basic)Government ID
Data elements: Social Security number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Initial access: valid_credentials

During the incident: Disconnected all access to the network
Engaged a specialized third-party cybersecurity firm and IT personnel to assist with securing the environment
Conducted a comprehensive forensic investigation to determine the nature and scope of the incident
Provided access to Single Bureau Credit Monitoring/Single Bureau Credit Report/Single Bureau Credit Score services at no charge for twelve (12) months
Provided proactive fraud assistance
Changes made: Secured the environment
Assessed the security of its systems
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 14 days(14 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-1276.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 11, 2024
Raw hash: 5f660a547dc30764b4a2010162a9b6a671c442306a6dc43ef6af81a045ba8a95

Reporting entityThunderbird Country Club

Victim entityThunderbird Country Club

Incidentdiscovered Mar 28, 2024

Stated responseDisconnected all access to the network

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov