HackingProfessional ServicesProfessional ServicesStolen CredentialsCustomer Data InvolvedData ExfiltratedIdentity (basic)Government IDFinancial accountPIIMediumContained

Clifton Larson Allen

bd_aa2a408399adf1c8 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Aug 28, 2017

Filed

Sep 20, 2017

To disclose

23 days

Affected

2state residents only

Confidence

66%

Full breach record for Clifton Larson Allen →

CliftonLarsonAllen LLP (CLA) disclosed that on August 28, 2017, a third-party service provider's client portal was compromised via stolen user credentials. Unauthorized access resulted in the exposure of client PII, including names, addresses, DOBs, SSNs, and bank account numbers. CLA notified the IRS/CI, secured accounts, and offered 12 months of credit monitoring.

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Incident timeline

discovery → filing · 23 days

Aug 28, 2017

Discovered

Sep 20, 2017

Filed

vs. sector median

14 wks faster

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

Name: Clifton Larson Allen
norm: clifton larson allen

Name: Clifton Larson Allen
norm: clifton larson allen
Industry: Professional Servicesllm

Discovered: Aug 28, 2017
Materiality determined: —
Notification sent: —
Affected individuals: 2state-resident count only
Data types: Identity (basic)Government IDFinancial accountPII
Data elements: Social Security numberDate of birth
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1114 Email Collection
Threat actor: ExternalFinancial
Regulator citations: contacted the Internal Revenue Service Criminal Investigations Division (“IRS/CI”)
Initial access: valid_credentials

During the incident: Began an investigation to determine what happened
Contacted the Internal Revenue Service Criminal Investigations Division (“IRS/CI”)
Prevented any further access to the affected user account credentials
Worked with the third-party service provider to enhance the security of the client portal system
Offering credit and identity monitoring services for 12 months at no cost
Changes made: Worked with the third-party service provider to enhance the security of the client portal system
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 23 days(23 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/Clifton-Larson-Allen.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 20, 2017
Raw hash: 54af88b45254faffe4480b8e564a0abb99af6c93a077dfd86fde4a9c757e8099

Reporting entityClifton Larson Allen

Victim entityClifton Larson Allen

Incidentdiscovered Aug 28, 2017

Stated responseBegan an investigation to determine what happened

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov