A Worm was a creature made out of Dark code and was described by parker to be a "type of malware". The Sourceror sent a worm into a bank's system to penetrate through the inner defenses after the outer defenses were weakened by Megabyte's forces.
Austin defeated the worm by making it eat itself after seeing one of the worms eat the other.
The worm was able to withstand the laser traps within the bank system. The lance of an alpha sentinel was able to cut through the worm. However, when the worm is cut in half with the Sentinel's lance by Austin, each of the halves grew into two worms.
The weakness of the worm was that it could be led into eating itself and its own kind. (Emotional Rescue)