HackingProfessional ServicesProfessional ServicesStolen CredentialsData ExfiltratedData PublishedCustomer Data InvolvedIdentity (basic)Government IDMediumContained

HARNISH GROUP INC.

bd_33f0b6908af9263a · schema v1 · pii pii-v1

Severity

Medium

Discovered

Nov 11, 2025

Filed

Dec 31, 2025

To disclose

7 weeks

Affected

710state residents only

Linked

4 filings

Confidence

67%

Full breach record for HARNISH GROUP INC. →

Harnish Group Inc. notified Montana employees of a November 11, 2025 incident involving unauthorized access via compromised credentials. The attacker exfiltrated and publicly posted files containing names and Social Security Numbers. Harnish engaged forensic experts, secured its network, and offered 2 years of Norton LifeLock monitoring to affected individuals.

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Incident timeline

discovery → filing · 7 weeks / 50 days

Nov 11, 2025

Discovered

Dec 31, 2025

Filed

vs. sector median

12 wks faster

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

Maine State AGbd_92841ba5998dd7632025-12-31Verified
Washington State AGbd_da95636ccea25b752025-12-29 · +2dCandidate
Indiana State AGbd_bf3d428b82f784ad2025-12-22 · +9dVerified

Name: HARNISH GROUP INC.
norm: harnish group
Domain: harnishgrp.com

Name: HARNISH GROUP INC.
norm: harnish group
Domain: harnishgrp.com
Industry: Professional Servicesllm

Discovered: Nov 11, 2025
Materiality determined: —
Notification sent: —
Affected individuals: 710state-resident count only
Data types: Identity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 ChannelT1486 Data Encrypted for Impact
Threat actor: ExternalFinancial
Initial access: valid_credentials

During the incident: Hired experts to conduct an in-depth forensic investigation
Partnered with Norton LifeLock to provide 2-year subscription for identity theft monitoring services
Changes made: Completed all changes to network to prevent this attack from reoccurring
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 7 weeks(50 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 ↗

Indiana State AGDec 22 · first

Washington State AG+7d

Maine State AG+9d

Montana State AG+9d · this page

Pattern: first filing Dec 22 (IN), last Dec 31 (MT) — a 9-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://dojmt.gov/wp-content/uploads/2026/03/Consumer-notification-letter-21.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Dec 31, 2025
Raw hash: 1f328d13de0731d27985ca16daa3612a97d8ff47966e5dbfc0ce389806ac86df

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityHARNISH GROUP INC.

Victim entityHARNISH GROUP INC.

Incidentdiscovered Nov 11, 2025

Stated responseHired experts to conduct an in-depth forensic investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov