HackingConstructionConstructionData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDMediumContained

Timberline Construction Corporation

bd_e7c9c4277b952d6d · schema v1 · pii pii-v1

Severity

Medium

Discovered

Aug 21, 2025

Filed

Oct 21, 2025

To disclose

9 weeks

Affected

Not disclosed

Linked

4 filings

Confidence

66%

Full breach record for Timberline Construction Corporation →

Timberline Construction notified consumers of a cyber incident discovered on August 21, 2025, where an unauthorized actor accessed and acquired files containing names and other personal information. The company secured its environment, launched an investigation, and is offering credit monitoring services. Residents of Vermont, New York, North Carolina, and Rhode Island were identified as potentially affected.

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Vermont clock⏱ VT AG >14 bday9 weeks discovery → filing

Incident timeline

discovery → filing · 9 weeks / 61 days

Aug 21, 2025

Begins

Aug 21, 2025

Discovered

Oct 21, 2025

Filed

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

New Hampshire State AGbd_59446d7c22d9720f2025-10-21Verified
Massachusetts State AGbd_d5bc00c9a62255882025-10-21Verified
Maine State AGbd_e95b5da2980419662025-10-21Candidate

Name: Timberline Construction Corporation
norm: timberline construction
Domain: timberlineconstruction.com

Name: Timberline Construction Corporation
norm: timberline construction
Domain: timberlineconstruction.com
Industry: Constructionllm

Discovered: Aug 21, 2025
Breach occurred: Aug 21, 2025
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: Identity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: External

During the incident: Took prompt steps to secure our environment
Launched an investigation to determine the nature and scope of the activity
Conducted a thorough review of the relevant files to determine their contents and to whom they relate
Notified potentially affected individuals
Offering complimentary access to credit monitoring services through Epiq
Changes made: Working to implement additional security measures to further protect against similar incidents in the future
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 9 weeks(61 days from discovery to filing)
Compliance flags: VT AG >14 bday
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

New Hampshire State AGOct 21 · first

Massachusetts State AGOct 21 · first

Maine State AGOct 21 · first

Vermont State AGOct 21 · 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://ago.vermont.gov/document/2025-10-21-timberline-construction-data-breach-notice-consumers
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 21, 2025
Raw hash: c155c8ae24b89cce49b9ddba01d6dc4b8269541bf7984e971a631dbb0c6e4cdf

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityTimberline Construction Corporation

Victim entityTimberline Construction Corporation

Incidentdiscovered Aug 21, 2025

Stated responseTook prompt steps to secure our environment

ComplianceVT AG >14 bday

Extraction provenanceno artifact recorded

Source provenanceago.vermont.gov