Social EngineeringFinancial ServicesFinancePhishingStolen CredentialsCustomer Data InvolvedMulti-Stage ChainIdentity (basic)Government IDFinancial accountMediumContained

Supplemental Income 401 (k) Plan

bd_7d25997d7574800f · schema v1 · pii pii-v1

Severity

Medium

Discovered

Mar 22, 2021

Filed

Jun 4, 2021

To disclose

11 weeks

Affected

145state residents only

Linked

3 filings

Confidence

64%

Full breach record for Supplemental Income 401 (k) Plan →

Supplemental Income 401(k) Plan notified Montana residents of a phishing attack compromising a third-party administrator's email account. Access occurred March 22–April 21, 2021. Data exposed included names, SSNs, DOBs, and financial account details. Forensic firm retained; credit monitoring offered.

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Incident timeline

discovery → filing · 11 weeks / 74 days

Mar 22, 2021

Begins

Mar 22, 2021

Discovered

Jun 4, 2021

Filed

vs. sector median

+2 wks slower

This filing is one of 3 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

Washington State AGbd_5e44d79cff1322a62021-06-03 · +1dCandidate
New Hampshire State AGbd_a5bb7ab96b54d4d42021-06-03 · +1dVerified

Name: Supplemental Income 401 (k) Plan
norm: supplemental income 401 k plan

Name: Supplemental Income 401 (k) Plan
norm: supplemental income 401 k plan
Industry: Financial Servicesllm

Discovered: Mar 22, 2021
Breach occurred: Mar 22, 2021 – Apr 21, 2021
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: May 1, 2021
Affected individuals: 145state-resident count only
Data types: Identity (basic)Government IDFinancial account
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid Accounts
Threat actor: ExternalFinancial
Third party: via Administrator
Initial access: phishing_link

During the incident: Retained a leading third-party forensic firm to conduct a review of the incident
Shut off unauthorized access to the email account
Taken additional security monitoring measures
Changes made: Offering a complimentary 24-month membership of Experian’s IdentityWorks at no cost
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 11 weeks(74 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Washington State AGJun 3 · first

New Hampshire State AGJun 3 · first

Montana State AG+1d · 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://dojmt.gov/wp-content/uploads/401-notif.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 4, 2021
Raw hash: 0cbc655a67b4712a5a6049a31bd70e287b4e69b8e56a19355adeb936d23c5421

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entitySupplemental Income 401 (k) Plan

Victim entitySupplemental Income 401 (k) Plan

Incidentdiscovered Mar 22, 2021

Stated responseRetained a leading third-party forensic firm to conduct a review of the incident

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov