HackingProfessional ServicesProfessional ServicesStolen CredentialsTargetedIdentity (basic)LowContained

McCathern, PLLC

bd_39862a44dc3b5b7d · schema v1 · pii pii-v1

Severity

Low

Discovered

Sep 5, 2023

Filed

Sep 22, 2023

To disclose

17 days

Affected

Not disclosed

Linked

2 filings

Confidence

66%

Full breach record for McCathern, PLLC →

McCathern, PLLC notified consumers of a cybersecurity incident where an unauthorized actor accessed portions of its network between November 28-29, 2022. The breach was discovered on September 5, 2023, following a forensic investigation. The accessed files contained names. McCathern contained the network, notified law enforcement, and engaged external cybersecurity professionals. The firm is offering one year of complimentary credit monitoring via TransUnion.

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Date basis clock✓ Clock withheld · confirmation date17 days discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 281 days

discovery → filing · 17 days

Nov 28, 2022

Begins

Sep 5, 2023

Discovered

Sep 22, 2023

Filed

vs. sector median

16 wks faster

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Massachusetts State AGbd_71dcf55702eac8e72023-09-26 · +4dVerified

Name: McCathern, PLLC
norm: mccathern

Name: McCathern, PLLC
norm: mccathern
Industry: Professional Servicesllm

Discovered: Sep 5, 2023
Breach occurred: Nov 28, 2022 – Nov 29, 2022
Undetected for: 281 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 22, 2023
Affected individuals: Not disclosed
Data types: Identity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Initial access: valid_credentials

During the incident: Contained the network
Notified law enforcement
Commenced a prompt and thorough investigation
Worked very closely with external cybersecurity professionals
Offering a membership in myTrueIdentity provided by TransUnion Interactive
Changes made: Continually evaluate and modify practices to enhance the security and privacy of your information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 17 days(17 days from discovery to filing)
Compliance flags: Clock withheld · confirmation date

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Vermont State AGSep 22 · first · this page

Massachusetts State AG+4d

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://ago.vermont.gov/document/2023-09-22-mccathern-data-breach-notice-consumers
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 22, 2023
Raw hash: 6f70bb506831f89d61a114c31376cf68c091044dc78d169f5379e51d19ae47f1

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityMcCathern, PLLC

Victim entityMcCathern, PLLC

Incidentdiscovered Sep 5, 2023

Stated responseContained the network

ComplianceClock withheld · confirmation date

Extraction provenanceno artifact recorded

Source provenanceago.vermont.gov