Malware is a very powerful quirk that allows AT0M the ability to completely manipulate technology and travel through connected technology by touch, as long as the device or system is powered on. Not only are they able to use the tech just by a touch, once they are inside it, they can use any system that has been coded into that particular device to do what they like. Since they are well practiced, most firewalls and system defenses are useless against them and they know how to not leave any traces.
AT0M can be halted by powerful defenses, but since Malware allows AT0M complete control of the system once they are inside, they can break through if they have time and energy. AT0M can also use tech by just touching from the outside, but they can only use the system to its basic functions and are limited by system protections unless they enter it.
AT0M has limitations of how many times they can enter and exit technology consecutively due to past quirk overuse, making it more transformative in nature. Once they are in the device, they are fine and suffer no consequences from the time they spend in there. But the act of shifting their body from particles and back to human recklessly, vice versa, has damaged them over time.
Quirk overuse can make AT0M feel a variety of different symptoms such as: delusions, chronic fatigue, migraines, excessive nosebleeds, numbness in their limbs (especially hands), dazed, slow to respond, incoherent, or passing out completely.