I noticed my sites being hit by many strange bots, even 100-200 at the same time on site, I am 90% these are bots that do click bombing, it matches the time when my AdSense account is going nuts (low cpc, earnings rollback, etc).
And by their behaviors and parameters, I am 100% sure all ~500 IPS are part of the same group.
I was able to identify them by certain parameters but if I post the list publicly, I am afraid that they will notice and they might make some changes so they cannot be identified in the future.
If anyone is interested, please send me a private message so I would reply with the list of IPs,I am curious if others can find same IPs in their logs and if your adsense account acts strangely (low CPC and so).