You need protocolLib http://dev.bukkit.org/bukkit-plugins/protocollib/
AntiAura is a bukkit plugin that allows you to test if player has kill aura. It basically sends packet that spawn fake players (1-6) for 0.5 second. The message is sent to administrator with result (how many test players were attacked).
alias: /ac <player>
SourceCode: http://github.com/maciekmm/antiauraCode (Text):ticksToKill: 10 #how much time in ticks give player to kill fake players
amountOfFakePlayers: 4 #how many fake players should spawn (1-6)
invisibility: true #should fake players be invisible (some kill auras may ignore them)
AntiAura (checkAura) 0.3
Check if someone has kill aura, easy to use.
- MC 1.8 support, maintainer has changed Jul 7, 2015
I like the plugin, it works perfectly though It sometimes ban players when they are hitting the top of their head like when I pvp'ed my staff without hacks I actually got banned...
Overall I like it!
Add a permission for players/staff to bypass the auto ban of this anti cheat.