IR-77 was an advanced battle droid deployed by the intergalactic spymaster known as the Shroud

The Shroud (Human) Character Minor Characters (Cold War era)

to protect the interests of his organization

The Shroud's Network Organization Galaxy-Wide Organizations

across the galaxy. In 3638 BBY, IR-77 was repeatedly deployed on numerous worlds to attack an enemy of the Shroud who was investigating the Shroud's relay network.