Mandan, Hidatsa, and Arikara Nation

The organisation is known as the Mandan, Hidatsa, and Arikara Nation.
It is also referred to as the Three Affiliated Tribes.
Another alias used for the group is The Mandan Nation.
Its headquarters is situated in the United States of America.

On April 28, 2021, the Mandan, Hidatsa, and Arikara Nation experienced a ransomware attack.
The attack compromised the tribe's servers.
As a result, critical files stored on those servers became inaccessible.
Email systems operated by the tribe were also rendered inaccessible.
Operational information essential to tribal functions was likewise made unavailable.
The incident underscores the broader cybersecurity challenges confronting tribal entities across the United States.
Ransomware actors have increasingly targeted such organisations to extort payments by threatening to leak or sell stolen data.
Other tribal nations, including the Squamish Nation, Washoe Tribe, and Colorado River Indian Tribes, have appeared on threat actor leak sites after similar cyber incidents.
Comprehensive reporting on cyberattacks against tribes remains limited because no centralized tracking mechanism exists.
The details of this event were reported by Databreaches.net in an article accessible online.