HackingEducationEducationStolen CredentialsData ExfiltratedTargetedPIIIdentity (basic)Government IDMediumContained

School District of Elmbrook

bd_c7b6cdac2a0616dd · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

Mar 16, 2023

To disclose

—

Affected

1state residents only

Linked

7 records

Confidence

66%

Full breach record for School District of Elmbrook →

CorrectionPublished Sep 26, 2026

Correction: we date this filing March 16, 2023, not 3/16/2022 as the Montana Department of Justice's breach register prints it. That date is earlier than the start of the breach the same register row reports (8/23/2022), and the Massachusetts breach register lists this notice on March 16, 2023.

Read their full statement

School District of Elmbrook notified individuals of unauthorized network access occurring August 23-27, 2022. Discovered Feb 27, 2023, after forensic review confirmed personal information (PII, SSN, DLs) was removed. District engaged external cybersecurity professionals and offered 12 months of Experian IdentityWorks credit monitoring.

J jump to incidentP pin to compareR raw source

Leak gap clock✗ Leak >180d

⚠ no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.

Incident timeline

Aug 23, 2022

Begins

Mar 16, 2023

Filed

This filing is one of 7 records about the same incident.View merged incident

A leak claim by vicesociety about this victim was first seen 193 days before this filing.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Sitevicesocietybd_7f2b03a8cf189ee72022-09-04 · +193dVerified by operator

Regulatory filings (5) · sorted by filing gap

Massachusetts State AGbd_f7b07cb2af127ba42023-03-16Verified by operator
New Hampshire State AGbd_132e2b67c110056b2023-03-20 · +4dVerified
Vermont State AGbd_07f8e00999ac259b2023-02-24 · +20dCandidate
Indiana State AGbd_3d648f4b42e330982022-09-23 · +174dVerified by operator

Show 1 more filing ↓up to 174d gap

Maine State AGbd_7a271ebaf508f2b02022-09-23 · +174dVerified by operator

Name: School District of Elmbrook
norm: school district of elmbrook

Name: School District of Elmbrook
norm: school district of elmbrook
Industry: Educationllm

Discovered: —
Breach occurred: Aug 23, 2022 – Aug 27, 2022
Materiality determined: —
Notification sent: —
Affected individuals: 1state-resident count only
Data types: PIIIdentity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Initial access: valid_credentials

During the incident: Commenced a prompt and thorough investigation
Working very closely with external cybersecurity professionals
Offering a complimentary one-year membership of Experian IdentityWorks Credit 3B
Source: Quoted from the filing itself, not independently verified.

Compliance flags: Leak >180d
Discovery-date grounding: no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 6 filings · 6 states

View merged incident ↗

Indiana State AGSep 23 · first

Maine State AGSep 23 · first

Vermont State AG+154d

Massachusetts State AG+174d

Montana State AG+174d · this page

New Hampshire State AG+178d

Pattern: first filing Sep 23 (IN), last Mar 20 (NH) — a 178-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-122.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 16, 2023
Raw hash: b8bc56e2c4c8298338f5992df4a01d6415d596773ecc9ad09bb088a3b825bf9b

Linked disclosures

Ransomware claims (1)

Regulatory filings (5) · sorted by filing gap

Reporting entitySchool District of Elmbrook

Victim entitySchool District of Elmbrook

IncidentUnauthorized Access

Stated responseCommenced a prompt and thorough investigation

ComplianceLeak >180d

Extraction provenanceno artifact recorded

Source provenancedojmt.gov