MalwareFinancial ServicesProfessional ServicesFinanceRansomwareData ExfiltratedRansom DemandedTargetedIdentity (basic)Government IDFinancial accountHealth (basic)PHIHighResolved

EISNER ADVISORY GROUP LLC

bd_61c9ad8db06a18a3 · schema v1 · pii pii-v1

Severity

High

Discovered

Sep 9, 2023

Filed

Apr 8, 2025

To disclose

19 months

Affected

2,121state residents only

Linked

12 filings

Confidence

71%

Full breach record for EISNER ADVISORY GROUP LLC →

Eisner Advisory Group LLC reported a ransomware incident affecting 2,121 Washington residents. Unauthorized access occurred Sept 4-9, 2023. Data included names, SSNs, driver's licenses, financial accounts, and medical info. Eisner notified law enforcement, regulators, and credit bureaus, and provided 12 months of credit monitoring.

J jump to incidentP pin to compareR raw source

Washington clock✗ WA AG >90d19 months discovery → filing

⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

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
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: 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: 2,121state-resident count only
Data types: Identity (basic)Government IDFinancial accountHealth (basic)PHI
Data elements: NameSocial Security numberDriver's licence numberFinancial account numberDate of birthPassport numberHealth insurance IDMedical information
WA-stated cause: Cyberattack
WA-stated duration: lifecycle 1-99dexposure 1-99d
WA-stated discovery: Found while ongoingContained same day
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: providing written notice of this incident to relevant state regulators, as necessarynotified state and industry regulators as required

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
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 of this incident to the three major credit reporting agencies, Equifax, Experian, and TransUnion
Notified law enforcement of this incident
Changes made: Implemented and is continuing to implement 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: WA AG >90d
Discovery-date grounding: AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

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

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

Washington 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://agportal-s3bucket.s3.amazonaws.com/databreach/BreachA32956.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: 3e5eb28f7a1f8b533daf5edea488fba8a7141ca6071bbc8316175bf4cda89965

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

ComplianceWA AG >90d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com