HackingProfessional ServicesProfessional ServicesStolen CredentialsData ExfiltratedIdentity (basic)LowContained

Costello, Cooney & Fearon, PLLC

bd_fb14bde6f981add0 · schema v1 · pii pii-v1

Severity

Low

Discovered

May 8, 2024

Filed

Dec 10, 2024

To disclose

31 weeks

Affected

1state residents only

Linked

3 filings

Confidence

65%

Full breach record for Costello, Cooney & Fearon, PLLC →

Costello, Cooney & Fearon, PLLC notified individuals of a data security incident where files were acquired without authorization on or about March 26, 2024. The firm discovered the incident on May 8, 2024, and notified the FBI. Personal information, including names, was potentially involved. The firm offered complimentary credit monitoring and identity theft protection services.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 43 days

discovery → filing · 31 weeks / 216 days

Mar 26, 2024

Begins

May 8, 2024

Discovered

Dec 10, 2024

Filed

vs. sector median

+12 wks slower

This filing is one of 3 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

New Hampshire State AGbd_5ede8fa2500a679f2024-12-10Verified
Massachusetts State AGbd_ad0bf7a3e435562a2024-12-10Verified

Name: Costello, Cooney & Fearon, PLLC
norm: costello cooney fearon

Name: Costello, Cooney & Fearon, PLLC
norm: costello cooney fearon
Industry: Professional Servicesllm

Discovered: May 8, 2024
Breach occurred: Mar 26, 2024
Undetected for: 43 daysoccurrence → discovery
Materiality determined: —
Notification sent: Dec 10, 2024
Affected individuals: 1state-resident count only
Data types: Identity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: ExternalFinancial
Regulator citations: Notified the Federal Bureau of Investigation
Initial access: valid_credentials

During the incident: Engaged cybersecurity experts to conduct an investigation
Worked with a third-party vendor to conduct a comprehensive review of the data
Notified the Federal Bureau of Investigation
Offering complimentary identity protection services through IDX
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 31 weeks(216 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

New Hampshire State AGDec 10 · first

Massachusetts State AGDec 10 · first

Montana State AGDec 10 · 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://dojmt.gov/wp-content/uploads/2025/03/Consumer-notification-letter-41.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Dec 10, 2024
Raw hash: ff767e93e32e5d09a03fac75ba066180d3e1d9052f7208bfeba7502b77de2100

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityCostello, Cooney & Fearon, PLLC

Victim entityCostello, Cooney & Fearon, PLLC

Incidentdiscovered May 8, 2024

Stated responseEngaged cybersecurity experts to conduct an investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov