HackingProfessional ServicesProfessional ServicesData ExfiltratedCustomer Data InvolvedGovernment IDIdentity (basic)MediumContained

Hilldun Corporation

bd_ae0e3d8276df2936 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jul 8, 2026

Filed

Jul 31, 2026

To disclose

23 days

Affected

2state residents only

Linked

4 filings

Confidence

66%

Full breach record for Hilldun Corporation →

Hilldun Corporation notified the New Hampshire Attorney General of a cybersecurity incident affecting 2 NH residents. Unauthorized access occurred between August 29, 2025, and September 9, 2025. The breach involved the exfiltration of names and Social Security numbers. Hilldun engaged third-party forensic investigators, contained the network, and is offering complimentary credit monitoring to affected individuals. Notification to residents began July 24, 2026.

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Leak gap clock✗ Leak >180d23 days discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 313 days

discovery → filing · 23 days

Aug 29, 2025

Begins

Jul 8, 2026

Discovered

Jul 31, 2026

Filed

vs. sector median

15 wks faster

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

A leak claim by play about this victim predates this filing by 326 days.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Siteplaybd_981b889fe6bf1d962025-09-08 · +326dVerified by operator

Regulatory filings (2) · sorted by filing gap

Vermont State AGbd_81df109cd779e4aa2026-07-24 · +7dVerified by operator
Massachusetts State AGbd_9845c94c74f804fa2026-07-24 · +7dVerified

Name: MCDONALD HOPKINS LLC
norm: mcdonald hopkins

Name: Hilldun Corporation
norm: hilldun
Domain: hilldun.com
Industry: Professional Servicesllm

Discovered: Jul 8, 2026
Breach occurred: Aug 29, 2025 – Sep 9, 2025
Undetected for: 313 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jul 24, 2026
Affected individuals: 2state-resident count only
Data types: Government IDIdentity (basic)
Data elements: Social Security number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 Channel
Threat actor: External
Initial access: exploit_public_facing

During the incident: Launched an investigation and contained and secured its internal environment
Worked very closely with third-party cybersecurity professionals
Conducted an extensive forensic investigation and manual document review
Offering the potentially affected residents whose Social Security numbers were potentially impacted with complimentary credit monitoring services
Changes made: Continually evaluates and modifies its practices to enhance the security and privacy of the personal information it maintains
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 23 days(23 days from discovery to filing)
Compliance flags: Leak >180d
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Vermont State AGJul 24 · first

Massachusetts State AGJul 24 · first

New Hampshire State AG+7d · this page

Pattern: first filing Jul 24 (VT), last Jul 31 (NH) — a 7-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://mm.nh.gov/files/uploads/doj/remote-docs/hilldun-20260731.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 31, 2026
Raw hash: af5ea5c7adcd52c4573a8e77f55a944e6588d2773c22ce5bfb4b2a5e03e8a055

Linked disclosures

Ransomware claims (1)

Regulatory filings (2) · sorted by filing gap

Reporting entityMCDONALD HOPKINS LLC

Victim entityHilldun Corporation

Incidentdiscovered Jul 8, 2026

Stated responseLaunched an investigation and contained and secured its internal environment

ComplianceLeak >180d

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov