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City of Mitchell

Claimed by Storm · listed 5 hours ago

Today
Age
since listed · data leaked

Status timeline

  1. ListedAug 24, 2026
  2. Data leakeddate unknown

At a glance

Group
Storm
Status
Data leaked
Country
United States
Sector
Government & Defense
Listed on leak site
Aug 24, 2026

About the victim

AI dossier — public-source company profile

City of Mitchell is the county seat of Davison County, South Dakota, and the principal city of the Mitchell Micropolitan Statistical Area. It serves as the municipal government for the city and surrounding region.

Industry
Local Government
Address
612 N Main Street, Mitchell, SD 57301, United States
Employees
51-200

Attack summary

Severity: medium — Municipal government entity targeted with data publication claimed by the group, but no proof files are advertised and no specific data categories are disclosed in the post.

The Storm ransomware group claims to have attacked the City of Mitchell. The leak post does not specify whether data was encrypted, exfiltrated, or both, nor does it detail what data categories are at stake.

medium

What the group claims

Mitchell is a city in and the county seat of Davison County, South Dakota, United States. Mitchell is the principal city of the Mitchell Micropolitan Statistical Area, which includes all of Davison and Hanson counties. The company headquarters is located in 612 N Main Street, Mitchell, SD 57301, United States. 51-200 Employees

Sources

Source

Indexed 5 hours ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

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Disclosure context

About Storm

Storm is a ransomware group first observed in August 2026, operating with an apparent financial motivation based on its targeting profile, though limited public documentation exists given its recent emergence and relatively small victim footprint. The group has claimed or been attributed to attacks against at least six known victims, with the United States representing its primary target geography. Storm has demonstrated a preference for targeting the healthcare and manufacturing sectors, alongside a broader category of other industries, suggesting an opportunistic rather than highly specialized targeting philosophy. Due to the group's recent emergence and limited victim count, comprehensive technical details regarding its initial access vectors, encryption methodology, tooling, or affiliation with known threat actor ecosystems have not yet been formally documented by CISA, the FBI, Mandiant, or other major threat intelligence publishers as of the time of this writing. No confirmed RaaS infrastructure, dark web leak site activity, or law enforcement actions against the group have been publicly attributed or reported in open sources. Given its nascent operational timeline beginning in 2026, Storm should be monitored as an emerging threat, particularly within the healthcare sector where ransomware attacks carry significant operational and patient safety implications, but analysts should treat any further characterization beyond the known victim and targeting data with caution pending additional corroborating intelligence. The group has been linked to 35 public disclosures across our corpus. First observed on a leak site on August 7, 2026; most recent post August 24, 2026. The operation is currently active.

Timeline of this disclosure

  • August 24, 2026City of Mitchell listed by Stormon the group's public leak site

Other recent disclosures by Storm

Storm has been linked to 35 public victims on Darkfield. A sample of the most recent:

See the full Storm dossier →

Sector and geography

This disclosure adds to ransomware activity in the Government & Defense sector, which has 5 disclosures indexed across all operators we track. Geographically, City of Mitchell is reported in United States, a country with 3,164 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Storm means City of Mitchell appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

  • Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
  • Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
  • Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
  • Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
  • Monitor for the data appearing on Storm's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.