MalwareFinancial ServicesTechnologyFinanceRansomwareStolen CredentialsVulnerability ExploitData ExfiltratedData EncryptedCustomer Data InvolvedMulti-Stage ChainSupply Chain (3P Vendor)Identity (basic)Government IDFinancial accountHealth (basic)PHICriticalContained

Landmark Admin

bd_473e2e2588c35528 · schema v1 · pii pii-v1

Severity

Critical

Discovered

May 13, 2024

Filed

Apr 11, 2025

To disclose

48 weeks

Affected · nationwide

1,613,7731,528 in this filing

Linked

16 filings

Confidence

66%

Full breach record for Landmark Admin →9 incidents on file

Landmark Admin, LLC, a third-party administrator for insurance carriers, reported a multi-stage cybersecurity incident discovered May 13, 2024. Attackers gained access via VPN using valid credentials, installed a backdoor on a third-party backup appliance, encrypted systems, and exfiltrated data. The incident affected approximately 1.6 million individuals nationwide, including 1,528 Maine residents. Data potentially compromised included names, SSNs, driver's licenses, bank account numbers, and health information. Landmark engaged forensic investigators, enhanced security controls (MFA, new firewall, server hardening), and offered 12 months of credit monitoring and identity theft protection.

J jump to incidentP pin to compareR raw source

Maine clockDiscovered May 13, 2024 → Filed with AG Apr 11, 2025333d ✗ ME AG >90d48 weeks discovery → filing

⚠ occurrence dateThe stored discovery date equals the breach OCCURRENCE date. Detection is normally later, so this OVERSTATES the delay — a 'late' verdict here may not be real.

Incident timeline

discovery → filing · 48 weeks / 333 days

May 13, 2024

Begins

May 13, 2024

Discovered

Apr 11, 2025

Filed

vs. sector median

+39 wks slower

This filing is one of 16 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

California State AGbd_19c021424afbcfb22025-04-11Verified by operator
Washington State AGbd_9e8821db12aad8972025-04-11Verified by operator
New Hampshire State AGbd_83109b510e4ed7122024-10-28 · +165dVerified by operator
Oregon State AGbd_694502fe4f1453a62024-10-23 · +170dVerified

Show 6 more filings ↓up to 170d gap

Indiana State AGbd_6c7ccc9b72bce2702024-10-23 · +170dVerified
Maine State AGbd_73af656696be6b732024-10-23 · +170dCandidate
California State AGbd_af6fea4c2516a11a2024-10-23 · +170dVerified
Washington State AGbd_b9b1aa056e46bc9f2024-10-23 · +170dVerified
Delaware State AGbd_f2927f007bf0104d2024-10-23 · +170dVerified
Vermont State AGbd_fa4dac0cae950a092024-10-23 · +170dVerified

Showing first 10 of 15 linked disclosures.

Name: Wilson Elser Moskowitz Edelman and Dicker LLP
norm: wilson elser moskowitz edelman dicker

Name: Landmark Admin
norm: landmark admin
Industry: Financial ServicesllmTechnologyllm

Discovered: May 13, 2024
Breach occurred: May 13, 2024 – Jun 17, 2024
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Oct 23, 2024
Affected individuals: 1,613,773state + nationwide
Data types: Identity (basic)Government IDFinancial accountHealth (basic)PHI
Data elements: Social Security numberDate of birth
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 ChannelT1190 Exploit Public-Facing Application
Threat actor: ExternalFinancial
Regulator citations: Filed supplemental notice with Maine Attorney General
Initial access: external_remote_services

During the incident: Disconnected affected systems and remote access to the network
Engaged a specialized third-party cybersecurity firm and IT personnel
Conducted live forensics and comprehensive forensic investigation
Notified insurance carriers
Changed account passcodes
Notified law enforcement
Mailed individual notification letters
Posted substitute notice on website
Published media notice in the Houston Chronicle
Changes made: Acquired servers and deployed after server hardening
Deployed a new firewall with the latest firmware
Obtained new external IP address assigned by a new Internet Service Provider
Implemented new domain controllers with new account naming conventions and forced new passwords
Enabled BitLocker on all hard drives
Reimaged all printers on the network
Reimaged all network switches and updated to the latest firmware
Reimaged and updated all IoT devices with the latest firmware
Provided additional security training for all staff members
Restricted all points of access to its systems
Engaged a managed service provider to supplement the existing strong security posture with additional monitoring and protection software
Required multifactor authentication for all devices (for both user and administrator logins)
Built a new system totally disconnected from the prior system
Set up surveillance on the new system
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 48 weeks(333 days from discovery to filing)
Compliance flags: ME AG >90d · 333dME resident >60d · 163dME CRA notice due
Discovery-date grounding: occurrence dateThe stored discovery date equals the breach OCCURRENCE date. Detection is normally later, so this OVERSTATES the delay — a 'late' verdict here may not be real.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: May 13, 2024
→ Filed with AG: Apr 11, 2025
333d 90 days ME AG >90d
Maine
Discovered: May 13, 2024
→ Notified: Oct 23, 2024
163d 60 days (analyst band; statutory cap is 30 days) ME resident >60d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: May 13, 2024 → Filed with AG: Apr 11, 2025	333d	90 days	ME AG >90d
Maine	Discovered: May 13, 2024 → Notified: Oct 23, 2024	163d	60 days (analyst band; statutory cap is 30 days)	ME resident >60d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 8 states

View merged incident ↗

Oregon State AGOct 23 · first

Indiana State AGOct 23 · first

Maine State AGOct 23 · first

California State AGOct 23 · first

Washington State AGOct 23 · first

Delaware State AGOct 23 · first

Vermont State AGOct 23 · first

New Hampshire State AG+5d

California State AG+170d

Washington State AG+170d

Maine State AG+170d · this page

Pattern: first filing Oct 23 (OR), last Apr 11 (ME) — a 170-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Cascade drawn from the first 10 linked disclosures of 15 — 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/d2573a7a-93b9-4b12-9a9b-15572078eb14.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 11, 2025
Raw hash: 82086d83e5ca863d75a99d0babace74c150112c8d6f4225198c327f0c3f239f1

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityWilson Elser Moskowitz Edelman and Dicker LLP

Victim entityLandmark Admin

Incidentdiscovered May 13, 2024

Stated responseDisconnected affected systems and remote access to the network

ComplianceME AG >90d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov