MalwareGovernmentGovernmentRansomwareData ExfiltratedData EncryptedRansom DemandedCustomer Data InvolvedPIIIdentity (basic)Government IDMediumActive

Winona County

bd_8cdf1e17adeab853 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jan 22, 2026

Filed

May 12, 2026

To disclose

—

Affected

Not disclosed

Linked

4 filings

Confidence

65%

Full breach record for Winona County →2 incidents on file

Winona County experienced a ransomware attack in January 2026. Unauthorized access occurred between Jan 18-22, 2026, resulting in data exfiltration and encryption. The County detected the ransomware on Jan 22, 2026, and notified law enforcement and state regulators. A review completed on April 16, 2026, identified affected individuals. The investigation is ongoing.

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Incident timeline

undetected · 4 days

Jan 18, 2026

Begins

Jan 22, 2026

Discovered

May 12, 2026

Filed

This filing is one of 4 about the same incident.View merged incident

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Siteinterlockbd_b4a4ad03d964689f2026-05-01 · +11dVerified

Regulatory filings (2) · sorted by filing gap

Massachusetts State AGbd_4f04d681b56f59262026-05-18 · +6dVerified
New Hampshire State AGbd_d0844e449554c09f2026-05-18 · +6dCandidate

Name: Winona County
norm: winona county
Domain: winonacounty.gov

Name: Winona County
norm: winona county
Domain: winonacounty.gov
Industry: Governmentllm

Discovered: Jan 22, 2026
Breach occurred: Jan 18, 2026 – Jan 22, 2026
Undetected for: 4 daysoccurrence → discovery
Materiality determined: —
Notification sent: Apr 16, 2026
Affected individuals: Not disclosed
Data types: PIIIdentity (basic)Government ID
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: notified all appropriate state regulators

During the incident: Launched an investigation with assistance from nationally recognized third-party cybersecurity and data forensics consultants
Notified federal law enforcement and appropriate state agencies
Cooperating with the federal law enforcement investigation into this incident
Took steps to strengthen network security
Notified all appropriate state regulators
Changes made: Strengthen network security
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.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Nebraska State AGMay 12 · first · this page

Massachusetts State AG+6d

New Hampshire State AG+6d

Pattern: first filing May 12 (NE), last May 18 (NH) — a 6-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://nebraska.gov/ago/data-breach/documents/3aee97ef-3239-4e55-8a5d-84854f2753f1.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 12, 2026
Raw hash: 10a3a4b07176ecb3a2f8e9dba01b8d63c2a243e24f10c7c5da24e726eb5c8eec

Linked disclosures

Ransomware claims (1)

Regulatory filings (2) · sorted by filing gap

Reporting entityWinona County

Victim entityWinona County

Incidentdiscovered Jan 22, 2026

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

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancenebraska.gov