HackingOtherData ExfiltratedIdentity (basic)Government IDMediumContained

Lyon Management Group, Inc.

bd_8d7dfd8fd9b8b74c · schema v1 · pii pii-v1

Severity

Medium

Discovered

Mar 15, 2024

Filed

Jan 29, 2025

To disclose

46 weeks

Affected

4state residents only

Linked

4 filings

Confidence

66%

Full breach record for Lyon Management Group, Inc. →

Lyon Management Group, Inc. notified the Maryland Attorney General of a data event affecting 4 Maryland residents. An unknown actor accessed systems and potentially copied files containing names, driver's license numbers, and Social Security numbers between March 14-15, 2024. Lyon secured systems, notified federal law enforcement, and provided 12 months of credit monitoring via TransUnion.

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Maryland clock✗ MD AG >90d46 weeks discovery → filing

Incident timeline

undetected · 1 days

discovery → filing · 46 weeks / 320 days

Mar 14, 2024

Begins

Mar 15, 2024

Discovered

Jan 29, 2025

Filed

vs. sector median

+38 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_143a112921db97852025-01-29Verified
California State AGbd_032cbe3b69a97abc2025-03-28 · +58dCandidate
Massachusetts State AGbd_3f0de297348acb892025-03-28 · +58dVerified

Name: Mullen Coughlin LLC
norm: mullen coughlin

Name: Lyon Management Group, Inc.
norm: lyon management
Industry: Otherllm

Discovered: Mar 15, 2024
Breach occurred: Mar 14, 2024 – Mar 15, 2024
Undetected for: 1 dayoccurrence → discovery
Materiality determined: —
Notification sent: Jan 29, 2025
Affected individuals: 4state-resident count only
Data types: Identity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: External
Regulator citations: Notified federal law enforcement

During the incident: Took steps to secure its IT systems
Commenced a thorough investigation into the full nature and scope of the incident
Notified federal law enforcement
Provided potentially impacted individuals with guidance on how to better protect against identity theft and fraud
Provided individuals with information on how to place a fraud alert and security freeze on one’s credit file
Provided contact details for the national consumer reporting agencies
Provided information on how to obtain a free credit report
Provided potentially affected Maryland residents with access to credit monitoring services for twelve (12) months through TransUnion at no cost
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 46 weeks(320 days from discovery to filing)
Compliance flags: MD AG >90d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

Indiana State AGJan 29 · first

Maryland State AGJan 29 · first · this page

California State AG+58d

Massachusetts State AG+58d

Pattern: first filing Jan 29 (IN), last Mar 28 (MA) — a 58-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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://oag.maryland.gov/resources-info/SBN%20Documents/2025/ITU-376263.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jan 29, 2025
Raw hash: 2c03d80c733229c46bb833326f1add0999d28acd474b443a23f2768ef7119f09

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityMullen Coughlin LLC

Victim entityLyon Management Group, Inc.

Incidentdiscovered Mar 15, 2024

Stated responseTook steps to secure its IT systems

ComplianceMD AG >90d

Extraction provenanceno artifact recorded

Source provenanceoag.maryland.gov