MalwareGovernmentGovernmentRansomwareData EncryptedRansom DemandedTargetedPIIIdentity (basic)LowActive

Winona County

bd_4f04d681b56f5926 · schema v1 · pii pii-v1

Severity

Low

Discovered

—

Filed

May 18, 2026

To disclose

—

Affected

Not disclosed

Linked

4 filings

Confidence

63%

Full breach record for Winona County →2 incidents on file

Winona County notified Massachusetts residents of a January 2026 ransomware attack involving personal information. The County is cooperating with federal law enforcement, has strengthened network security, and is offering 24 months of credit monitoring through IDX. An investigation into a separate April 2026 incident is ongoing.

J jump to incidentP pin to compareR raw source

Incident timeline

Jan 1, 2026

Begins

May 18, 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 · +17dVerified

Regulatory filings (2) · sorted by filing gap

New Hampshire State AGbd_d0844e449554c09f2026-05-18Candidate
Nebraska State AGbd_8cdf1e17adeab8532026-05-12 · +6dVerified

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

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

Discovered: —
Breach occurred: Jan 1, 2026 – Jan 31, 2026
Materiality determined: —
Notification sent: May 12, 2026
Affected individuals: Not disclosed
Data types: PIIIdentity (basic)
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for Impact
Threat actor: ExternalFinancial
Regulator citations: notified all appropriate state regulators

During the incident: Began the process of securing our network and initiating an investigation
Cooperating with the federal law enforcement investigation
Took steps to strengthen network security
Notified all appropriate state regulators
Offering complimentary identity monitoring services
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

New Hampshire State AG+6d

Massachusetts State AG+6d · this page

Pattern: first filing May 12 (NE), last May 18 (MA) — 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://www.mass.gov/doc/2026-801-winona-county/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 18, 2026
Raw hash: dfdf3731386e3885fb9d1d62cd4d8fd8a045bb1e886d5b71d995466e726bf963

Linked disclosures

Ransomware claims (1)

Regulatory filings (2) · sorted by filing gap

Reporting entityWinona County

Victim entityWinona County

IncidentRansomware

Stated responseBegan the process of securing our network and initiating an investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov