MalwareManufacturingManufacturingRansomwareCapture Stored DataData EncryptedData ExfiltratedTargetedIdentity (basic)Government IDFinancial accountPHIHealth (basic)MediumContained

Antigo Construction

bd_a20723f7a3265c32 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jun 11, 2025

Filed

Oct 31, 2025

To disclose

20 weeks

Affected

4state residents only

Linked

3 filings

Confidence

66%

Full breach record for Antigo Construction →

Antigo Construction, Inc. notified Montana residents of a ransomware incident occurring June 1-11, 2025. Unauthorized actors encrypted files containing PII, SSNs, tax IDs, driver's licenses, financial accounts, and health insurance info. The company engaged cybersecurity and law enforcement, and offers one year of credit monitoring.

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Incident timeline

undetected · 10 days

discovery → filing · 20 weeks / 142 days

Jun 1, 2025

Begins

Jun 11, 2025

Discovered

Oct 31, 2025

Filed

vs. sector median

+10 wks slower

This filing is one of 3 about the same incident.View merged incident

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Sitedragonforcebd_951ce8deaeedc4182025-06-26 · +126dVerified

Regulatory filings (1) · sorted by filing gap

Indiana State AGbd_f26ce1151d0571002025-10-31Verified

Name: Antigo Construction
norm: antigo construction
Domain: antigoconstruction.com

Name: Antigo Construction
norm: antigo construction
Domain: antigoconstruction.com
Industry: Manufacturingllm

Discovered: Jun 11, 2025
Breach occurred: Jun 1, 2025 – Jun 11, 2025
Undetected for: 10 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 4state-resident count only
Data types: Identity (basic)Government IDFinancial accountPHIHealth (basic)
Data elements: Social Security number
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1119 Automated Collection
Threat actor: ExternalFinancial
Regulator citations: Notified law enforcement

During the incident: Implemented response protocols
Took measures to contain the activity
Launched an investigation
Engaged a cybersecurity firm
Notified law enforcement
Changes made: Enhanced existing security measures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 20 weeks(142 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 ↗

Indiana State AGOct 31 · first

Montana State AGOct 31 · 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/2025/11/Consumer-notification-letter-4.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 31, 2025
Raw hash: 982bb9fa8b641a19648053d7c4ebcd7885ebb95e49b2536aa1ce993b202d5d0a

Linked disclosures

Ransomware claims (1)

Regulatory filings (1) · sorted by filing gap

Reporting entityAntigo Construction

Victim entityAntigo Construction

Incidentdiscovered Jun 11, 2025

Stated responseImplemented response protocols

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov