Meshk's cube

The Meshk's cube, also known as Infected Cooperative Cube, was a Borg starship, a Borg tactical cube battleship, in Borg Cooperative service in the 2410s decade. Its commanding officer was the Octanti Meshk. 

History
A group of Octanti, including Meshk, volunteered to be assimilated by by the Borg Collective in 2403, to infect the Borg with a virus.

In 2410, Meshk was the commanding officer of a tactical cube liberated from the Collective. The crew of the infected Cooperative cube was dying from the virus, and the cube was failing. Sensing the upcoming talks between the Delta Alliance, Borg Cooperative, and Ambassador Rerrick of the Octanti, Meshk directed his tactical cube to the Russan system. There, the cube's defensive systems came online and disabled the Octanti ships. The Alliance members attacked the cube to subdue it. When Meshk spoke with Rerrick - his brother - the ambassador was swayed to bring the virus down and save the infected Cooperative cube and its crew. The event convinced the ambassador that liberated Borg were free of the hivemind, and the Octanti joined the Delta Alliance.