Well I think I'll buy it. Says its built off the source engine.
Which makes me believe that the old Source Engine cheats are going to work with it as well.
Click attack, wait until the progress bar fills (directly below attack/mask/scan/etc) and some text pops up saying your virus has successfully damaged the system, repeat until it's hacked/you are. Make sure to read all the button descriptions.
I'd try opening with mask, as it lowers the enemy system's attack, then watch its stats and go from there.