HackingEducationEducationData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDFinancial accountMediumContained

River Delta Unified School District

bd_e46148466028f10f · schema v1 · pii pii-v1

Severity

Medium

Discovered

Dec 20, 2023

Filed

Sep 16, 2024

To disclose

39 weeks

Affected

Not disclosed

Linked

2 filings

Confidence

65%

Full breach record for River Delta Unified School District →

River Delta Unified School District notified the California AG of a data breach discovered on December 20, 2023. An unknown external actor gained unauthorized access to district systems and copied files containing names, Social Security numbers, and financial account information. The district secured systems, engaged forensic investigators, notified the FBI, and is offering credit monitoring to affected individuals.

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Leak gap clock✗ Leak >180d39 weeks discovery → filing

Incident timeline

discovery → filing · 39 weeks / 271 days

Dec 20, 2023

Begins

Dec 20, 2023

Discovered

Sep 16, 2024

Filed

vs. sector median

+30 wks slower

This filing is one of 2 about the same incident.View merged incident

A leak claim by meow about this victim predates this filing by 209 days.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Sitemeowbd_ce831661b0aae3602024-02-20 · +209dCandidate

Name: River Delta Unified School District
norm: river delta unified school district

Name: River Delta Unified School District
norm: river delta unified school district
Industry: Educationllm

Discovered: Dec 20, 2023
Breach occurred: Dec 20, 2023
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: Identity (basic)Government IDFinancial account
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: External
Regulator citations: Notified the Federal Bureau of Investigation

During the incident: Took steps to secure our systems and to restore functionality to the affected systems
Launched an investigation with the assistance of third-party computer specialists
Notified the Federal Bureau of Investigation of this event
Offering complimentary access to credit monitoring services through Equifax Credit Watch Gold
Changes made: Reviewing our existing policies and procedures regarding cybersecurity
Evaluating additional measures and safeguards to protect against this type of event in the future
Implementing additional network security measures to further enhance our network security
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 39 weeks(271 days from discovery to filing)
Compliance flags: Leak >180d
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.

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://oag.ca.gov/ecrime/databreach/reports/sb24-591724
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 16, 2024
Raw hash: 29832f33c2267f9ff44dcd66e8e2682ac834ee4410560b69384809bda63e383d

Linked disclosures

Ransomware claims (1)

Reporting entityRiver Delta Unified School District

Victim entityRiver Delta Unified School District

Incidentdiscovered Dec 20, 2023

Stated responseTook steps to secure our systems and to restore functionality to the affected systems

ComplianceLeak >180d

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov