HackingGovernment IDIdentity (basic)MediumContained

Guymon Public Schools

bd_cc90b4147a7b7b92 · schema v1 · pii pii-v2

Severity

Medium

Discovered

Oct 3, 2024

Filed

Feb 28, 2025

To disclose

—

Affected

Not disclosed

Linked

3 filings

Confidence

65%

Full breach record for Guymon Public Schools →

Guymon Public Schools notified affected individuals of a data security incident where an unauthorized individual accessed the network between October 1 and October 8, 2024. The breach involved unauthorized access to files containing full names and Social Security numbers. The school engaged outside cybersecurity professionals for investigation and offered complimentary Experian IdentityWorks credit monitoring to affected individuals.

J jump to incidentP pin to compareR raw source

Leak gap clock⏱ Leak >90d

Incident timeline

undetected · 2 days

Oct 1, 2024

Begins

Oct 3, 2024

Discovered

Feb 28, 2025

Filed

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

A leak claim by ransomhub about this victim predates this filing by 148 days.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (2)

Leak Siteransomhubbd_c3823078910add622024-10-03 · +148dVerified by operator
Leak Siteransomhubbd_fc51ed5140cced592024-10-03 · +148dCandidate

Name: Guymon Public Schools
norm: guymon public schools
Domain: guymontigers.com

Name: Guymon Public Schools
norm: guymon public schools
Domain: guymontigers.com

Discovered: Oct 3, 2024
Breach occurred: Oct 1, 2024 – Oct 8, 2024
Undetected for: 2 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: Government IDIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Initial access: valid_credentials

During the incident: Launched an investigation in consultation with outside cybersecurity professionals
Offering a complimentary 1-year membership of Experian IdentityWorks
Changes made: Continually evaluate and modify our practices and internal controls to enhance the security and privacy of your information
Source: Quoted from the filing itself, not independently verified.

Compliance flags: Leak >90d
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://nebraska.gov/ago/data-breach/documents/Guymon_-_Adult_SSN__Redacted_(35797328.1)_Redacted_35797330v1.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Feb 28, 2025
Raw hash: 63c20321210fbf571e1411ddd37d158294f02fc67b0f81562772786f7a4ab2cf

Linked disclosures

Ransomware claims (2)

Reporting entityGuymon Public Schools

Victim entityGuymon Public Schools

Incidentdiscovered Oct 3, 2024

Stated responseLaunched an investigation in consultation with outside cybersecurity professionals

ComplianceLeak >90d

Extraction provenanceno artifact recorded

Source provenancenebraska.gov