MalwareGovernmentGovernmentRansomwareData EncryptedData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDMediumContained

Mower County, Minnesota

bd_fa61ae41b6a44930 · schema v1 · pii pii-v2

Severity

Medium

Discovered

Jun 18, 2025

Filed

Dec 3, 2025

To disclose

—

Affected

Not disclosed

Confidence

64%

Mower County, Minnesota, notified affected individuals on December 3, 2025, regarding a ransomware attack detected on June 18, 2025. Unauthorized access occurred between June 11 and June 18, 2025. The incident involved the encryption of data and unauthorized access to network systems, resulting in the exfiltration of personal information including names and government identifiers. The County engaged forensic consultants, alerted federal law enforcement, and is offering complimentary identity monitoring services to affected residents.

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Incident timeline

undetected · 7 days

Jun 11, 2025

Begins

Jun 18, 2025

Discovered

Dec 3, 2025

Filed

Tracked as a single-filing incident — the only disclosure on record for this event so far.ConfirmedView incident

Name: Mower County, Minnesota
norm: mower county
Domain: co.mower.mn.us

Name: Mower County, Minnesota
norm: mower county
Domain: co.mower.mn.us
Industry: Governmentllm

Discovered: Jun 18, 2025
Breach occurred: Jun 11, 2025 – Jun 18, 2025
Undetected for: 7 daysoccurrence → discovery
Materiality determined: —
Notification sent: Dec 3, 2025
Affected individuals: Not disclosed
Data types: Identity (basic)Government ID
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1119 Automated Collection
Threat actor: ExternalFinancial
Regulator citations: notified Minnesota IT Servicesnotify all appropriate state regulators regarding this incident

During the incident: Launched an investigation with assistance from nationally recognized cybersecurity and data forensics consultants
Alerted federal law enforcement
Conducted a thorough review of the impacted data
Deployed security tools to enhance detection and accelerate response to cyber incidents
Actively monitoring our network using end point detection tools to help ensure containment
Conducting an enterprise-wide password reset
Notified Minnesota IT Services
Notify all appropriate state regulators regarding this incident
Changes made: Deployed security tools to enhance detection and accelerate response to cyber incidents
Actively monitoring our network using end point detection tools to help ensure containment
Conducting an enterprise-wide password reset
Source: Quoted from the filing itself, not independently verified.

Compliance flags: — (clock not assessable for this source)

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/d3ab10e2-9bc6-4835-bae6-56110b0f02f5.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Dec 3, 2025
Raw hash: fb5879e3625ddaa7b186d0135c7edf11248e8c22c695b48023843cc989a639cd

Reporting entityMower County, Minnesota

Victim entityMower County, Minnesota

Incidentdiscovered Jun 18, 2025

Stated responseLaunched an investigation with assistance from nationally recognized cybersecurity and data forensics consultants

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancenebraska.gov