Social EngineeringProfessional ServicesProfessional ServicesPhishingCustomer Data InvolvedIdentity (basic)Government IDFinancial accountMediumContained

Walker Advertising, LLC

bd_580a39ef0d72c9a0 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Dec 1, 2025

Filed

Jun 5, 2026

To disclose

27 weeks

Affected

2state residents only

Linked

5 filings

Confidence

66%

Full breach record for Walker Advertising, LLC →2 incidents on file

Walker Advertising, LLC notified the New Hampshire Attorney General on June 5, 2026, of a data event affecting two NH residents. Unauthorized access to an employee email account occurred between Oct 14 and Dec 1, 2025, likely via phishing. Exposed data included names, SSNs, and financial account info. Walker engaged third-party specialists, offered 12 months of credit monitoring via Epiq, and implemented additional security safeguards.

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Incident timeline

undetected · 48 days

discovery → filing · 27 weeks / 186 days

Oct 14, 2025

Begins

Dec 1, 2025

Discovered

Jun 5, 2026

Filed

vs. sector median

+8 wks slower

This filing is one of 5 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

Indiana State AGbd_17b19e19edcc277a2026-06-05Verified
Massachusetts State AGbd_55e71ec2600ec2802026-06-05Candidate
Nebraska State AGbd_ea52f2c3d3e53ecb2026-06-05Verified
Maine State AGbd_eff6b68d708537712026-06-05Verified

Name: Mullen Coughlin LLC
norm: mullen coughlin

Name: Walker Advertising, LLC
norm: walker advertising
Domain: walkeradvertising.com
Industry: Professional Servicesllm

Discovered: Dec 1, 2025
Breach occurred: Oct 14, 2025 – Dec 1, 2025
Undetected for: 48 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 5, 2026
Affected individuals: 2state-resident count only
Data types: Identity (basic)Government IDFinancial account
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing Link
Threat actor: External
Regulator citations: Providing written notice of this incident to relevant state regulators
Initial access: phishing_link

During the incident: Launched an investigation with the assistance of third-party technology specialists
Completed a comprehensive review of the potentially impacted email files
Provided notice to those individuals identified
Provided access to credit monitoring services for twelve (12) months, through Epiq
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
Changes made: Working to implement additional safeguards and training to its employees
Reviewing our policies and procedures related to cybersecurity and are implementing additional security measures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 27 weeks(186 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 5 states

View merged incident ↗

Indiana State AGJun 5 · first

Massachusetts State AGJun 5 · first

Nebraska State AGJun 5 · first

Maine State AGJun 5 · first

New Hampshire State AGJun 5 · first · this page

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/walker-advertising-20260605.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 5, 2026
Raw hash: b647c3693b6dbf4c66c60bd188dc9c0868f7b9ae49fa293e77fb734910adfe6c

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityMullen Coughlin LLC

Victim entityWalker Advertising, LLC

Incidentdiscovered Dec 1, 2025

Stated responseLaunched an investigation with the assistance of third-party technology specialists

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov