This record tracks a ransomware attack claimed by the
Storm group against
City of Mitchell. It collects the publicly disclosed attack details — sector, location and
timeline — as published on the operator's leak site and indexed by Breach House.
Window Zero
EXPOSURE GAP
Window Zero is the time the breach stayed in the open before
anyone said so — the gap between when the attack was first discovered
on the operator's leak site (t1) and when it was publicly disclosed (t2).
The wider this window, the longer victims, staff and customers were exposed with no warning.
1day open
t1 · Published
t2 · Pending
Business Category
Public Sector
Published
August 23, 2026
Disclosed / Notified
Not disclosed yet
Attack Summary
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
Leak Screenshots
SAMPLE
Proof-of-breach screenshots the operator posted from the stolen data. Previews are
redacted and locked — the originals are available on HaveIBeenRansom.
Dark Web Exposure
Cross-referenced against HaveIBeenRansom's dark-web index of ransomware leaks, breaches & infostealer logs.
0
found in Infostealer logs
0
found in Traditional breaches
0
found in Ransomware leaks
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••• emails
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••• emails
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••• emails
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••• emails
Full exposure is locked
See every breached email, the internal-vs-external split and each leak source behind this victim.
Legal Disclaimer:
This ransomware victim record reflects information published on the operator's leak site.
Breach.house does not acquire, download, host, access or redistribute unlawfully obtained data. It indexes only publicly visible information posted by ransomware, breach and infostealer operators and open web sources, without accessing the underlying stolen content. The service supports public awareness, legitimate research and cyber-resilience.