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

Supplemental Income 401 (k) Plan

bd_5e44d79cff1322a6 · schema v1 · pii pii-v1

Severity

High

Discovered

Mar 22, 2021

Filed

Jun 3, 2021

To disclose

10 weeks

Affected

1,085state residents only

Linked

3 filings

Confidence

71%

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

Supplemental Income 401(k) Plan notified Washington AG of a phishing attack compromising a third-party administrator's email account. Unauthorized access occurred March 22–April 21, 2021. 1,085 Washington residents affected. Data included names, SSNs, DOBs, and financial account details. Forensic review conducted; 24-month credit monitoring offered.

J jump to incidentP pin to compareR raw source

Washington clock⏱ WA AG >30d10 weeks discovery → filing

Incident timeline

discovery → filing · 10 weeks / 73 days

Mar 22, 2021

Begins

Mar 22, 2021

Discovered

Jun 3, 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

New Hampshire State AGbd_a5bb7ab96b54d4d42021-06-03Verified
Montana State AGbd_7d25997d7574800f2021-06-04 · +1dVerified

Name: SEYFARTH SHAW LLP
norm: seyfarth shaw

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: Jun 3, 2021
Affected individuals: 1,085state-resident count only
Data types: Identity (basic)Government IDFinancial account
Data elements: NameSocial Security numberDate of birth
WA-stated cause: Cyberattack
WA-stated duration: lifecycle 1-99dexposure 1-99d
WA-stated discovery: Found after the fact
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email Collection
Threat actor: ExternalFinancial
Regulator citations: Notified Washington State, Office of the Attorney General
Third party: via Administrator
Initial access: phishing_link

During the incident: A leading forensic firm was retained to assist in conducting a review of the incident
The Plan has taken additional security monitoring measures to help further protect against this type of incident going forward
The Plan began mailing notice to the impacted individuals on June 3, 2021
Changes made: Providing individuals whose personal information was potentially affected by this incident with access to credit monitoring services for 24 months through Experian at no cost to the individuals
Providing impacted individuals with guidance on how to better protect against identity theft and fraud
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 10 weeks(73 days from discovery to filing)
Compliance flags: WA AG >30d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

New Hampshire State AGJun 3 · first

Washington State AGJun 3 · first · this page

Montana State AG+1d

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://agportal-s3bucket.s3.amazonaws.com/databreach/BreachM10479.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 3, 2021
Raw hash: ac77369f175b025ec525a93904676aa538cadbcd1b048d5366ec7a3ba407a5f7

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entitySEYFARTH SHAW LLP

Victim entitySupplemental Income 401 (k) Plan

Incidentdiscovered Mar 22, 2021

Stated responseA leading forensic firm was retained to assist in conducting a review of the incident

ComplianceWA AG >30d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com