HackingProfessional ServicesProfessional ServicesStolen CredentialsSupply Chain (3P Vendor)Data ExfiltratedGovernment IDIdentity (basic)MediumContained

Tonneson & Company, PC

bd_6179866e2d1fee36 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Dec 1, 2023

Filed

Apr 25, 2024

To disclose

21 weeks

Affected

12state residents only

Linked

2 filings

Confidence

67%

Full breach record for Tonneson & Company, PC →

Tonneson & Company, PC notified the NH Attorney General of a data security incident involving its third-party payroll vendor, Paycor. The incident stemmed from a MOVEit zero-day vulnerability exploited by attackers. Tonneson learned in December 2023 that employee data was impacted. Written notice was sent on April 25, 2024, to 12 New Hampshire residents, offering credit monitoring and identity protection services.

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Incident timeline

discovery → filing · 21 weeks / 146 days

Dec 1, 2023

Discovered

Apr 25, 2024

Filed

vs. sector median

+3 wks slower

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_2074db8e76da2e7b2024-04-25Verified

Name: Tonneson & Company, PC
norm: tonneson

Name: Tonneson & Company, PC
norm: tonneson
Industry: Professional Servicesllm

Discovered: Dec 1, 2023
Materiality determined: —
Notification sent: Apr 25, 2024
Affected individuals: 12state-resident count only
Data types: Government IDIdentity (basic)
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain CompromiseT1190 Exploit Public-Facing Application
Threat actor: Partner
Initial access: supply_chain

During the incident: Review the list of impacted individuals
Provided notification to impacted individuals
Provided written notice of this incident on April 25, 2024 to 12 potentially impacted New Hampshire residents via First Class U.S. Mail
Provided notification to impacted individuals to access complimentary credit monitoring and identity protection services
Changes made: Provided notification to impacted individuals to access complimentary credit monitoring and identity protection services
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 21 weeks(146 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 AGApr 25 · first

New Hampshire State AGApr 25 · 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/tonneson-20240425.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 25, 2024
Raw hash: eea3ca741bdda8ce52fd798d6f288b4c921b91cc1a1150fd9f5b6e68abdf395d

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityTonneson & Company, PC

Victim entityTonneson & Company, PC

Incidentdiscovered Dec 1, 2023

Stated responseReview the list of impacted individuals

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov