HackingProfessional ServicesProfessional ServicesStolen CredentialsCapture Stored DataData ExfiltratedCustomer Data InvolvedTargetedIdentity (basic)Government IDMediumContained

EISNER ADVISORY GROUP LLC

bd_27e512fd0cdac557 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Sep 9, 2023

Filed

Apr 8, 2025

To disclose

19 months

Affected

130state residents only

Linked

12 filings

Confidence

65%

Full breach record for EISNER ADVISORY GROUP LLC →

Eisner Advisory Group LLC notified the NH AG of unauthorized access to limited personal information of 130 NH residents between Sept 4-9, 2023. The breach was detected on Sept 9, 2023. Eisner completed its review on Feb 13, 2025, and notified residents on April 8, 2025, offering credit monitoring services.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 5 days

discovery → filing · 19 months / 577 days

Sep 4, 2023

Begins

Sep 9, 2023

Discovered

Feb 13, 2025

Scope determined

Apr 8, 2025

Filed

vs. sector median

+64 wks slower

This filing is one of 12 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Vermont State AGbd_0e87a3f3a7019a002025-04-08Verified
Washington State AGbd_61c9ad8db06a18a32025-04-08Candidate
Iowa State AGbd_9c143312e5d526b82025-04-08Verified
Oregon State AGbd_bd4df5a263203c7d2025-04-08Verified

Show 6 more filings ↓

Nebraska State AGbd_bf58b4074b8bdb072025-04-08Verified
Massachusetts State AGbd_c5bece9672884b592025-04-08Verified
Montana State AGbd_e35702ee8e886a3f2025-04-08Verified
Indiana State AGbd_ea112341cfa5a4d92025-04-08Verified
California State AGbd_ed6f19b468a372e92025-04-08Verified
Maine State AGbd_f8dee5063c7117622025-04-08Verified

Showing first 10 of 11 linked disclosures.

Name: EISNER ADVISORY GROUP LLC
norm: eisner advisory

Name: EISNER ADVISORY GROUP LLC
norm: eisner advisory
Industry: Professional Servicesllm

Discovered: Sep 9, 2023
Breach occurred: Sep 4, 2023 – Sep 9, 2023
Undetected for: 5 daysoccurrence → discovery
Materiality determined: Feb 13, 2025
Notification sent: Apr 8, 2025
Affected individuals: 130state-resident count only
Data types: Identity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: ExternalFinancial
Regulator citations: Notified New Hampshire Attorney General Consumer Protection & Antitrust Bureau
Initial access: valid_credentials

During the incident: Launched an investigation into the nature and scope of the incident
Conducted a detailed review of the files determined to be at risk
Provided written notice to affected New Hampshire residents
Offered credit monitoring through IDX identity protection membership
Changes made: Offered credit monitoring through IDX identity protection membership
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 19 months(577 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 11 states

View merged incident ↗

Vermont State AGApr 8 · first

Washington State AGApr 8 · first

Iowa State AGApr 8 · first

Oregon State AGApr 8 · first

Nebraska State AGApr 8 · first

Massachusetts State AGApr 8 · first

Montana State AGApr 8 · first

Indiana State AGApr 8 · first

California State AGApr 8 · first

Maine State AGApr 8 · first

New Hampshire State AGApr 8 · first · this page

Cascade drawn from the first 10 linked disclosures of 11 — the full spread may be wider.

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/eisner-advisory-group-20250408.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 8, 2025
Raw hash: 28021da74ab847beea2cdafd516921e30ab92730f4f418e64efae073d58243eb

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityEISNER ADVISORY GROUP LLC

Victim entityEISNER ADVISORY GROUP LLC

Incidentdiscovered Sep 9, 2023

Stated responseLaunched an investigation into the nature and scope of the incident

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov