That's illegal. You can't break into someones house to kick out a burglar. The people that have counteracted and kicked out bots from botnets broke laws in several countries (fed crime in US), which is why they don't publicize their identity (even if they did, prosecutors may not come after them). You need the consent of the system owner to help them with the intrusion, otherwise anyone can hack into someone else's computer and say they were there to get rid of some malware.
