Cyber Threat Intelligence
CH
Ransomware Victim Public Sector

Cheyenne & Arapaho Tribes

Ransomware attack by Rhysida · Disclosed February 17, 2026 · 🇺🇸 United States

Date Disclosed
Feb 17, 2026
2026
Threat Group
Rhysida
190 total victims
Country
🇺🇸 United States
Industry
Public Sector

Incident Analysis

Cheyenne & Arapaho Tribes was targeted by Rhysida ransomware, one of the most active ransomware groups in our database with 190 confirmed victims globally. The attack was disclosed on February 17, 2026, when Cheyenne & Arapaho Tribes appeared on the group's dark web leak site.

Cheyenne & Arapaho Tribes is based in United States , operating in the Public Sector sector. United States ranks #1 globally for ransomware attacks, with 7,123 victims in our database.

Sector context: Organisations in this sector hold valuable data and operational systems that ransomware groups seek to exploit for financial gain through encryption and data exfiltration.

Rhysida typically employs a double extortion model: first exfiltrating sensitive data from the victim's systems, then deploying ransomware to encrypt files. Victims face two simultaneous threats — paying to restore access and paying to prevent publication of stolen data. The group's leak site publishes victim names and exfiltrated data as leverage.

Data source: This incident record is sourced from public ransomware group leak site disclosures aggregated via the ransomware.live API. Disclosure date reflects when the victim was published on the leak site, which may differ from the initial date of compromise. This platform does not publish or link to stolen data. Last data update: Apr 21, 2026 18:01 UTC.

Frequently Asked Questions

Was Cheyenne & Arapaho Tribes attacked by ransomware?

Yes. Cheyenne & Arapaho Tribes was listed as a victim of the Rhysida ransomware group on February 17, 2026. The organisation is based in United States and operates in the Public Sector sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Cheyenne & Arapaho Tribes?

Cheyenne & Arapaho Tribes was attacked by Rhysida ransomware. Rhysida is one of the most active ransomware groups, having claimed 190 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Cheyenne & Arapaho Tribes ransomware attack occur?

The ransomware attack on Cheyenne & Arapaho Tribes was disclosed on February 17, 2026. This date reflects when the victim was published on the threat group's leak site, which may differ from the actual date of initial compromise.

What data was stolen in the Cheyenne & Arapaho Tribes ransomware attack?

The specific data stolen from Cheyenne & Arapaho Tribes has not been independently verified by this platform. Ransomware groups typically exfiltrate data before encrypting systems and use the threat of publication to pressure victims. As a Public Sector organisation, Cheyenne & Arapaho Tribes likely held sensitive business data, client information, and operational records.

How can organisations protect against Rhysida attacks?

To defend against Rhysida and similar threat actors, organisations should: maintain regular offline backups tested for restoration; implement network segmentation to limit lateral movement; deploy multi-factor authentication on all remote access; use endpoint detection and response (EDR) tools; conduct regular phishing and security awareness training; and monitor threat intelligence feeds for indicators of compromise (IOCs) associated with active groups.