Cheyenne & Arapaho Tribes

Cheyenne & Arapaho Tribes was compromised in a ransomware attack attributed to rhysida in February 2026. The organization, operating in the Government sector in United States, was added to the group's data leak site as part of an extortion campaign.

rhysida operates as a financially motivated ransomware-as-a-service (RaaS) operation, exfiltrating sensitive data and threatening public disclosure to pressure victims into paying ransom demands.

Cheyenne & Arapaho Tribes The Cheyenne and Arapaho Tribes are a federally recognized united nation of two distinct peoples-the Tsistsistas (Cheyenne) and Hinono'ei (Arapaho)-with a historic alliance formed in the early 19th century.