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

CliftonLarsonAllen LLP

bd_b273a7f02c7b989b · schema v1 · pii pii-v1

Severity

Medium

Discovered

Aug 28, 2017

Filed

Sep 20, 2017

To disclose

23 days

Affected

Not disclosed

Linked

2 filings

Confidence

65%

Full breach record for CliftonLarsonAllen LLP →2 incidents on file

CliftonLarsonAllen LLP (CLA) notified affected individuals on September 20, 2017, of a data breach discovered on August 28, 2017. A third-party service provider's client portal was compromised via stolen user credentials, exposing client tax info, SSNs, DOBs, and bank account numbers. CLA engaged the IRS Criminal Investigations Division 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

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_ce98022af7ef8d312017-09-20Verified

Name: CliftonLarsonAllen LLP
norm: cliftonlarsonallen

Name: CliftonLarsonAllen LLP
norm: cliftonlarsonallen
Industry: Professional Servicesllm

Discovered: Aug 28, 2017
Materiality determined: —
Notification sent: Sep 20, 2017
Affected individuals: Not disclosed
Data types: Identity (basic)Government IDFinancial account
Data elements: Social Security numberDate of birth
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
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.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Massachusetts State AGSep 20 · first

New Hampshire State AGSep 20 · 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://mm.nh.gov/files/uploads/doj/remote-docs/cliftonlarsonallen-20170920.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: b0c3c060c472528321d0eb19a7efa5d9b7eb406cd7a868078310a3f87faeda9b

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityCliftonLarsonAllen LLP

Victim entityCliftonLarsonAllen LLP

Incidentdiscovered Aug 28, 2017

Stated responseBegan an investigation to determine what happened

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov