HackingProfessional ServicesProfessional ServicesStolen CredentialsRansomwareRansom DemandedRansom PaidData ExfiltratedCustomer Data InvolvedPIIIdentity (basic)Government IDMediumResolved

Horizon Actuarial Services, LLC

bd_6982cd5680a29cd2 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Nov 12, 2021

Filed

Mar 22, 2022

To disclose

19 weeks

Affected

2state residents only

Linked

5 filings

Confidence

65%

Horizon Actuarial Services, LLC notified Montana residents of a data breach where unauthorized access occurred on Nov 10-11, 2021. The attacker stole personal data including names, SSNs, and DOBs. Horizon paid a ransom and provided 12 months of Kroll identity monitoring to affected individuals. Notices began mailing on Jan 13, 2022.

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Incident timeline

undetected · 2 days

discovery → filing · 19 weeks / 130 days

Nov 10, 2021

Begins

Nov 12, 2021

Discovered

Mar 22, 2022

Filed

vs. sector median

on median

This filing is one of 5 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

New Hampshire State AGbd_acc2dcb63f662ce22022-03-22Verified
Indiana State AGbd_d5dbaf531c8c6ab32022-03-22Verified
Massachusetts State AGbd_2a6f4982277e509b2022-03-23 · +1dVerified by operator
HHS OCRbd_94b34e9a602234962022-03-11 · +11dVerified by operator

Name: Horizon Actuarial Services, LLC
norm: horizon actuarial services

Name: Horizon Actuarial Services, LLC
norm: horizon actuarial services
Industry: Professional Servicesllm

Discovered: Nov 12, 2021
Breach occurred: Nov 10, 2021 – Nov 11, 2021
Undetected for: 2 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jan 13, 2022
Affected individuals: 2state-resident count only
Data types: PIIIdentity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1486 Data Encrypted for Impact
Threat actor: ExternalFinancial
Regulator citations: Provided notice to the FBI
Initial access: valid_credentials

During the incident: Initiated efforts to secure its computer servers
Launched an investigation with the assistance of third-party computer specialists
Provided notice to the FBI
Negotiated with and paid the group in exchange for an agreement that they would delete and not distribute or otherwise misuse the stolen information
Began mailing letters to individuals associated with benefit plans that authorized them to do so
Arranged for identity monitoring services for 12 months provided by Kroll
Changes made: Reviewing its existing security policies
Implemented additional measures to further protect against similar incidents moving forward
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 19 weeks(130 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 5 states

View merged incident ↗

HHS OCRMar 11 · first

New Hampshire State AG+11d

Indiana State AG+11d

Montana State AG+11d · this page

Massachusetts State AG+12d

Pattern: first filing Mar 11 (NY), last Mar 23 (MA) — a 12-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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/Consumer-Notification-Letter-444.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 22, 2022
Raw hash: 7c56189cefbd0ae6b97ba88f78dd976cab723559da6d96df480cb6a9f9a9f8ca

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityHorizon Actuarial Services, LLC

Victim entityHorizon Actuarial Services, LLC

Incidentdiscovered Nov 12, 2021

Stated responseInitiated efforts to secure its computer servers

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov