HackingProfessional ServicesProfessional ServicesStolen CredentialsTargetedCustomer Data InvolvedIdentity (basic)Government IDFinancial accountMediumContained

Maddison & Caison LLP

bd_e3716c43e99f1734 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jun 20, 2018

Filed

Sep 28, 2018

To disclose

14 weeks

Affected

2state residents only

Confidence

66%

Full breach record for Maddison & Caison LLP →2 incidents on file

Maddison & Caison LLP notified Montana AG of a data breach affecting client tax information. Unauthorized access occurred starting June 20, 2018. Compromised data included names, SSNs, DOBs, and potentially bank account numbers. The firm engaged forensic investigators, reset passwords, and provided 2 years of credit monitoring.

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Incident timeline

discovery → filing · 14 weeks / 100 days

Jun 20, 2018

Begins

Jun 20, 2018

Discovered

Sep 28, 2018

Filed

vs. sector median

4 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed2 affectedView incident

Name: Maddison & Caison LLP
norm: maddison caison

Name: Maddison & Caison LLP
norm: maddison caison
Industry: Professional Servicesllm

Discovered: Jun 20, 2018
Breach occurred: Jun 20, 2018
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Nov 28, 2018
Affected individuals: 2state-resident count only
Data types: Identity (basic)Government IDFinancial account
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: ExternalFinancial
Regulator citations: working closely with the IRSworking closely with other relevant state tax departments
Initial access: valid_credentials

During the incident: Launched an investigation
Working with third-party forensic investigators
Notified law enforcement
Working closely with the IRS and other relevant state tax departments
Resetting passwords
Installing a security monitoring appliance
Changes made: Installing a security monitoring appliance to enhance existing security safeguards
Arranged to have AllClear ID protect your identity for two (2) years at no cost
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 14 weeks(100 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

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/Maddison-Caison-MC.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 28, 2018
Raw hash: 38b0c37488f469f3d2c312b04ae469e64f53df35eba7d195128e0e5e08eb64a6

Reporting entityMaddison & Caison LLP

Victim entityMaddison & Caison LLP

Incidentdiscovered Jun 20, 2018

Stated responseLaunched an investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov