Social EngineeringProfessional ServicesProfessional ServicesPhishingStolen CredentialsTargetedCustomer Data InvolvedIdentity (basic)Government IDMediumContained

Knox McLaughlin Gornall & Sennett PC

bd_2d23f22a176fe23c · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 29, 2025

Filed

Oct 8, 2025

To disclose

19 weeks

Affected

1state residents only

Linked

4 filings

Confidence

66%

Full breach record for Knox McLaughlin Gornall & Sennett PC →

Knox McLaughlin Gornall Sennett, P.C. notified the NH Attorney General of a data security event affecting one NH resident. Unauthorized access to an employee email account occurred on May 14, 2025, discovered May 29, 2025. Names and SSNs were potentially accessed. The firm engaged forensic experts, reset passwords, notified the FBI, and provided 12 months of credit monitoring.

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Incident timeline

undetected · 15 days

discovery → filing · 19 weeks / 132 days

May 14, 2025

Begins

May 29, 2025

Discovered

Oct 8, 2025

Filed

vs. sector median

on median

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

Montana State AGbd_d1c1c06c6d0484812025-10-08Verified by operator
Vermont State AGbd_7d8ac106361b59de2025-10-07 · +1dVerified
Maine State AGbd_9dba301b3923e6662025-10-07 · +1dCandidate

Name: Knox McLaughlin Gornall & Sennett PC
norm: knox mclaughlin gornall sennett

Name: Knox McLaughlin Gornall & Sennett PC
norm: knox mclaughlin gornall sennett
Industry: Professional Servicesllm

Discovered: May 29, 2025
Breach occurred: May 14, 2025
Undetected for: 15 daysoccurrence → discovery
Materiality determined: —
Notification sent: Oct 7, 2025
Affected individuals: 1state-resident count only
Data types: Identity (basic)Government ID
Data elements: Social Security number
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid Accounts
Threat actor: ExternalFinancial
Regulator citations: Notified the Federal Bureau of Investigation
Initial access: phishing_link

During the incident: Engaging a team of cybersecurity experts
Implementing a forced password reset
Notifying law enforcement
Launching a comprehensive investigation
Notified the Federal Bureau of Investigation regarding the event
Changes made: Working to implement additional safeguards and training to its employees
Providing access to credit monitoring services for 12 months through TransUnion
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 19 weeks(132 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 ↗

Vermont State AGOct 7 · first

Maine State AGOct 7 · first

Montana State AG+1d

New Hampshire State AG+1d · 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/knox-mclaughlin-gornall-sennett-20251008.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 8, 2025
Raw hash: 9c9465d0375f9c0a04b8dfab41b0d26f210823d9779db20f871dabcec8fee4e4

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityKnox McLaughlin Gornall & Sennett PC

Victim entityKnox McLaughlin Gornall & Sennett PC

Incidentdiscovered May 29, 2025

Stated responseEngaging a team of cybersecurity experts

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov