HackingProfessional ServicesProfessional ServicesStolen CredentialsMulti-Stage ChainData ExfiltratedCustomer Data InvolvedPIIIdentity (basic)LowActive

Kiernan Trebach

bd_26cc665cc7425bbf · schema v1 · pii pii-v1

Severity

Low

Discovered

Oct 21, 2024

Filed

May 7, 2025

To disclose

28 weeks

Affected

8state residents only

Linked

4 filings

Confidence

65%

Full breach record for Kiernan Trebach →

Kiernan Trebach LLP notified the New Hampshire Attorney General of unauthorized access to its systems occurring between May 2023 and September 2024. The firm discovered suspicious activity on October 21, 2024. Eight New Hampshire residents were affected. The firm notified law enforcement, offered credit monitoring, and is implementing additional safeguards.

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Incident timeline

undetected · 536 days

discovery → filing · 28 weeks / 198 days

May 4, 2023

Begins

Oct 21, 2024

Discovered

Mar 4, 2025

Scope determined

May 7, 2025

Filed

vs. sector median

+10 wks slower

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

Indiana State AGbd_20e2c2f3f38f13432025-05-07Candidate
Maine State AGbd_7b76d4db13b517c52025-05-07Verified
Massachusetts State AGbd_8164b8b8512cd9482025-05-07Verified

Name: Kiernan Trebach
norm: kiernan trebach
Domain: kiernantrebach.com

Name: Kiernan Trebach
norm: kiernan trebach
Domain: kiernantrebach.com
Industry: Professional Servicesllm

Discovered: Oct 21, 2024
Breach occurred: May 4, 2023 – Sep 24, 2024
Undetected for: 536 daysoccurrence → discovery
Materiality determined: Mar 4, 2025
Notification sent: May 7, 2025
Affected individuals: 8state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: External
Regulator citations: Notified Office of the New Hampshire Attorney General
Initial access: valid_credentials

During the incident: Launched an investigation
Conducted a review of relevant systems
Notified federal law enforcement regarding the event
Providing access to credit monitoring services for individuals whose personal information was potentially affected by this incident, at no cost to these individuals
Providing impacted individuals with guidance on how to better protect against identity theft and fraud
Changes made: Working to implement additional safeguards and training to its employees
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 28 weeks(198 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 AGMay 7 · first

Maine State AGMay 7 · first

Massachusetts State AGMay 7 · first

New Hampshire State AGMay 7 · 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/kiernan-trebach-20250507.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 7, 2025
Raw hash: a5c43d5e45b91a26a70562957bced08721bfdb8f3668ca67e82670c9f6e8eafa

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityKiernan Trebach

Victim entityKiernan Trebach

Incidentdiscovered Oct 21, 2024

Stated responseLaunched an investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov