HackingConstructionConstructionData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDMediumActive

Timberline Construction Corporation

bd_59446d7c22d9720f · schema v1 · pii pii-v1

Severity

Medium

Discovered

Aug 21, 2025

Filed

Oct 21, 2025

To disclose

9 weeks

Affected

44state residents only

Linked

4 filings

Confidence

66%

Full breach record for Timberline Construction Corporation →

Timberline Construction notified the NH Attorney General of a cyber incident affecting 44 New Hampshire residents. On August 21, 2025, the company detected suspicious activity and determined an unauthorized actor accessed systems containing names, Social Security numbers, and passport numbers. The investigation is ongoing. The company is providing one year of credit monitoring through Epiq and implementing additional security safeguards.

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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

Massachusetts State AGbd_d5bc00c9a62255882025-10-21Verified
Vermont State AGbd_e7c9c4277b952d6d2025-10-21Verified
Maine State AGbd_e95b5da2980419662025-10-21Candidate

Name: Timberline Construction
norm: timberline construction

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: Oct 20, 2025
Affected individuals: 44state-resident count only
Data types: Identity (basic)Government ID
Attack vector: Unknown
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: Notified Office of the New Hampshire Attorney General

During the incident: Took prompt steps to secure the environment
Launched an investigation to determine the nature and scope of the activity
Undertook a review of the files to determine their contents and to whom they relate
Provided written notice of this incident to forty-four (44) New Hampshire residents
Providing access to credit monitoring services for one (1) year through Epiq
Providing impacted individuals with guidance on how to better protect against identity theft and fraud
Providing individuals with information on how to place a fraud alert and security freeze on one’s credit file
Providing written notice of this incident to relevant state regulators, as necessary
Changes made: Working to implement additional safeguards and training to its employees
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: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

Massachusetts State AGOct 21 · first

Vermont State AGOct 21 · first

Maine State AGOct 21 · first

New Hampshire 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://mm.nh.gov/files/uploads/doj/remote-docs/timberline-construction-20251021.pdf
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: 822bf08d0fbf5d367da10af7edfb11fb054350b9cd63923543ee7c70323787d5

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityTimberline Construction

Victim entityTimberline Construction Corporation

Incidentdiscovered Aug 21, 2025

Stated responseTook prompt steps to secure the environment

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov