Get Malware to hit the Code Cage 4 times to reveal its code. Touch the code and Malware's head will open. Hit the battery to do damage to Malware. Beware, though: Malware gets angrier and more insane when you attack it until you reach its final phase. The space that the Code Cage rests on top of serves as protection for Malware's fist/slap attacks and its eye lasers. It doesn't protect against the swarming viruses, ground wedge, or floating laser attacks.
Props to Griffpatch for much of Scratch Cat's coding. All music made by me with Garageband. Please comment if you find a glitch (Malware hid a few of those, I'm sure) or have a suggestion (Malware doesn't care about those, but I do!)