MalwareGovernmentGovernmentRansomwareData EncryptedCustomer Data InvolvedPIIIdentity (basic)LowContained

Winona County

bd_30724b94e44bf221 · schema v1 · pii pii-v2

Severity

Low

Discovered

—

Filed

Oct 1, 2026

To disclose

—

Affected

10state residents only

Linked

5 records

Confidence

67%

Full breach record for Winona County →2 incidents on file

Winona County, Minnesota notified Massachusetts residents of a ransomware attack in April 2026 that impacted protected information. The County secured its network, initiated an investigation, deployed security tools, and conducted an enterprise-wide password reset. Complimentary identity monitoring services are offered to affected individuals.

J jump to incidentP pin to compareR raw source

Incident timeline

Apr 1, 2026

Begins

Oct 1, 2026

Filed

This filing is one of 5 records about the same incident.View merged incident

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Siteinterlockbd_b4a4ad03d964689f2026-05-01 · +153dVerified

Regulatory filings (2) · sorted by filing gap

Vermont State AGbd_4ef1c8616a85c0522026-10-08 · +7dVerified by operator
New Hampshire State AGbd_ec2b73271f8aca002026-10-14 · +13dCandidate

Press reports (1)

Pressinterlockbd_192fea38c147277e2026-04-06 · +178dVerified by operator

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

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

Discovered: —
Breach occurred: Apr 1, 2026 – Apr 30, 2026
Materiality determined: —
Notification sent: Oct 8, 2026
Affected individuals: 10state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for Impact
Threat actor: ExternalFinancial

During the incident: Secured our network
Initiating an investigation
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
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
Offering 24 months of complimentary identity theft protection services through IDX
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 ↗

Massachusetts State AGOct 1 · first · this page

Vermont State AG+7d

New Hampshire State AG+13d

Pattern: first filing Oct 1 (MA), last Oct 14 (NH) — a 13-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://www.mass.gov/doc/2026-1783-winona-county-minnesota/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 1, 2026
Raw hash: 8c399384b7324ed6c53a181477d16c49f0bb41f284d49f8d615209bcf4de4fdb

Linked disclosures

Ransomware claims (1)

Regulatory filings (2) · sorted by filing gap

Press reports (1)

Reporting entityWinona County

Victim entityWinona County

IncidentRansomware

Stated responseSecured our network

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov