Social EngineeringProfessional ServicesProfessional ServicesPhishingStolen CredentialsCustomer Data InvolvedIdentity (basic)Government IDMediumContained

TDT CPAs

bd_9c8b0de60a0bf5ee · schema v1 · pii pii-v1

Severity

Medium

Discovered

Nov 29, 2018

Filed

Jul 25, 2019

To disclose

34 weeks

Affected

1state residents only

Confidence

65%

Full breach record for TDT CPAs →2 incidents on file

TDT CPAs and Advisors, P.C. notified Montana residents that an unauthorized individual accessed an employee's email account between August 16-24, 2018. The firm discovered the breach on November 29, 2018, after forensic review. Personal information, including names and Social Security numbers, was exposed. No evidence of misuse was found. The firm offered one year of Experian IdentityWorks credit monitoring.

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Incident timeline

undetected · 105 days

discovery → filing · 34 weeks / 238 days

Aug 16, 2018

Begins

Nov 29, 2018

Discovered

Jul 25, 2019

Filed

vs. sector median

+16 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed1 affectedView incident

Name: TDT CPAs
norm: tdt cpas

Name: TDT CPAs
norm: tdt cpas
Industry: Professional Servicesllm

Discovered: Nov 29, 2018
Breach occurred: Aug 16, 2018 – Aug 24, 2018
Undetected for: 105 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 1state-resident count only
Data types: Identity (basic)Government ID
Data elements: Social Security number
Attack vector: Phishing
MITRE ATT&CK: T1078 Valid AccountsT1114 Email Collection
Threat actor: ExternalFinancial
Initial access: phishing_link

During the incident: Commenced a prompt and thorough investigation
Worked very closely with external cybersecurity professionals
Conducted an extensive forensic investigation and manual email review
Notified affected individuals by telephone
Offered a complimentary one-year membership of Experian IdentityWorks Credit 3B
Changes made: Continually evaluate and modify practices and internal controls to enhance the security and privacy of your information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 34 weeks(238 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/OCP/Breach-NotificationDetails-61.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 25, 2019
Raw hash: a1df2ba643568b3e44702716d50a01e346a304b00bdbc3475a477335b5d8bc0c

Reporting entityTDT CPAs

Victim entityTDT CPAs

Incidentdiscovered Nov 29, 2018

Stated responseCommenced a prompt and thorough investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov