HackingFinancial ServicesProfessional ServicesFinanceData ExfiltratedCustomer Data InvolvedDelayed DiscoveryIdentity (basic)Government IDFinancial accountHealth (basic)PIIHighResolved

EISNER ADVISORY GROUP LLC

bd_f8dee5063c711762 · schema v1 · pii pii-v1

Severity

High

Discovered

Sep 9, 2023

Filed

Apr 8, 2025

To disclose

19 months

Affected · nationwide

84,79582 in this filing

Linked

12 filings

Confidence

65%

Full breach record for EISNER ADVISORY GROUP LLC →

Eisner Advisory Group LLC reported an external system breach (hacking) occurring between September 4 and 9, 2023. The incident compromised names, SSNs, driver's licenses, financial account info, DOB, and medical/insurance data for 84,795 individuals, including 82 in Maine. Eisner discovered the suspicious activity on September 9, 2023, and notified affected individuals on April 8, 2025. The investigation is concluded.

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Maine clockDiscovered Sep 9, 2023 → Filed with AG Apr 8, 2025577d ✗ ME AG >90d19 months 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 · 5 days

discovery → filing · 19 months / 577 days

Sep 4, 2023

Begins

Sep 9, 2023

Discovered

Apr 8, 2025

Filed

vs. sector median

+74 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
New Hampshire State AGbd_27e512fd0cdac5572025-04-08Verified
Washington State AGbd_61c9ad8db06a18a32025-04-08Candidate
Iowa State AGbd_9c143312e5d526b82025-04-08Verified

Show 6 more filings ↓

Oregon State AGbd_bd4df5a263203c7d2025-04-08Verified
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

Showing first 10 of 11 linked disclosures.

Name: EISNER ADVISORY GROUP LLC
norm: eisner advisory

Name: EISNER ADVISORY GROUP LLC
norm: eisner advisory
Industry: Financial ServicesllmProfessional Servicesllm

Discovered: Sep 9, 2023
Breach occurred: Sep 4, 2023 – Sep 9, 2023
Undetected for: 5 daysoccurrence → discovery
Materiality determined: —
Notification sent: Apr 8, 2025
Affected individuals: 84,795state + nationwide
Data types: Identity (basic)Government IDFinancial accountHealth (basic)PII
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Providing written notice of this incident to relevant state regulatorsProviding written notice to the three major credit reporting agencies, Equifax, Experian, and TransUnion
Initial access: exploit_public_facing

During the incident: Conducted a detailed review of the files determined to be at risk
Implemented and is continuing to implement additional safeguards and training to its employees
Providing access to credit monitoring services for twelve (12) months, through IDX, a Zerofox Company
Providing impacted individuals with guidance on how to better protect against identity theft and fraud
Providing written notice of this incident to relevant state regulators
Providing written notice to the three major credit reporting agencies, Equifax, Experian, and TransUnion
Notified law enforcement of this incident
Changes made: Implemented additional safeguards and training to its employees
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 19 months(577 days from discovery to filing)
Compliance flags: ME AG >90d · 577dME resident >180d · 577d
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.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Sep 9, 2023
→ Filed with AG: Apr 8, 2025
577d 90 days ME AG >90d
Maine
Discovered: Sep 9, 2023
→ Notified: Apr 8, 2025
577d 180 days ME resident >180d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Sep 9, 2023 → Filed with AG: Apr 8, 2025	577d	90 days	ME AG >90d
Maine	Discovered: Sep 9, 2023 → Notified: Apr 8, 2025	577d	180 days	ME resident >180d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 11 states

View merged incident ↗

Vermont State AGApr 8 · first

New Hampshire 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 · 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://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/602a61a2-18b4-4e62-be78-93cfe3ef3653.html
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: 8e66bfa6b82a2f8bf4ddfff981daae2e0d02515167fcb8a5d56076b7f9e13a40

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityEISNER ADVISORY GROUP LLC

Victim entityEISNER ADVISORY GROUP LLC

Incidentdiscovered Sep 9, 2023

Stated responseConducted a detailed review of the files determined to be at risk

ComplianceME AG >90d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov