You know nothing about the insecticon activities here on earth, but the name "Virucon" does strike a chord within you. Back on cybertron, the decepticons, when faced against the power of the matrix of leadership, had created a "virus" to attack the autobot leader and the matrix in hopes of destroying it. But the attack failed as the then Autobot leader, Maximus, simply removed the matrix from his body and passed it to Alpha Metron. Not long after, the Virucons destroyed Maximus.
With the plan failed, and the Autobots destroying Maximus' body, the Virucons were forgotten, though several of them escaped and evolved into much larger and more powerful transformers. On cybertron, Virucons were not much more than a nuisance, attacking power reactors and feeding off of the energon.