MalwareManufacturingManufacturingRansomwareData ExfiltratedData EncryptedCustomer Data InvolvedFinancial accountHealth (basic)Identity (basic)Government IDPHIMediumContained

Hamilton Construction Company

bd_702357320a487dee · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jun 19, 2025

Filed

Nov 12, 2025

To disclose

21 weeks

Affected

610state residents only

Linked

4 filings

Confidence

71%

Full breach record for Hamilton Construction Company →

Hamilton Construction Company experienced a ransomware cyberattack on June 19, 2025, resulting in unauthorized access to personal information including SSNs, driver's licenses, and medical data. The company notified 610 Washington residents on November 12, 2025, and provided 12 months of credit monitoring services.

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Washington clock✗ WA AG >90d21 weeks discovery → filing

⚠ occurrence dateThe stored discovery date equals the breach OCCURRENCE date. Detection is normally later, so this OVERSTATES the delay — a 'late' verdict here may not be real.

Incident timeline

discovery → filing · 21 weeks / 146 days

Jun 19, 2025

Begins

Jun 19, 2025

Discovered

Nov 12, 2025

Filed

vs. sector median

+10 wks slower

This filing is one of 4 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

Nebraska State AGbd_3891a4fb15ceb59d2025-11-12Verified
Montana State AGbd_4e6c6d46de10a0782025-11-12Candidate
Oregon State AGbd_37032daff42f3bab2025-12-15 · +33dVerified

Name: Hamilton Construction Company
norm: hamilton construction

Name: Hamilton Construction Company
norm: hamilton construction
Industry: Manufacturingllm

Discovered: Jun 19, 2025
Breach occurred: Jun 19, 2025
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Nov 12, 2025
Affected individuals: 610state-resident count only
Data types: Identity (basic)Government IDHealth (basic)Financial account
Data elements: NameSocial Security numberDriver's licence numberFinancial account numberDate of birthPassport numberHealth insurance IDMedical information
WA-stated cause: Cyberattack
WA-stated duration: lifecycle 0dexposure 0d
WA-stated discovery: Found while ongoingContained same day
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for Impact
Threat actor: ExternalFinancial
Regulator citations: Notified federal law enforcementNotified relevant regulatory authorities

During the incident: Moved quickly to investigate and respond
Assess the security of its systems
Identify potentially affected individuals
Notified federal law enforcement
Notified relevant regulatory authorities
Notified the three major credit reporting agencies
Providing access to credit monitoring and identity restoration services for twelve (12) months, through Epiq
Changes made: Reviewing and enhancing its existing policies and procedures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 21 weeks(146 days from discovery to filing)
Compliance flags: WA AG >90d
Discovery-date grounding: occurrence dateThe stored discovery date equals the breach OCCURRENCE date. Detection is normally later, so this OVERSTATES the delay — a 'late' verdict here may not be real.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

Nebraska State AGNov 12 · first

Montana State AGNov 12 · first

Washington State AGNov 12 · first · this page

Oregon State AG+33d

Pattern: first filing Nov 12 (NE), last Dec 15 (OR) — a 33-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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://agportal-s3bucket.s3.amazonaws.com/databreach/BreachA35496.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 12, 2025
Raw hash: 14ad7ca02da07045d5ad6396d0f4858ff8510446ab82f9e751a07e2fa7461bd9

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityHamilton Construction Company

Victim entityHamilton Construction Company

Incidentdiscovered Jun 19, 2025

Stated responseMoved quickly to investigate and respond

ComplianceWA AG >90d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com