Here is an explanation of hacks made by DestructPvP:
-Kill aura
One of the most famous hacks is Kill aura. You see Kill aura is a self explanatory type of hack. It's an aura where once you enter a certain radius of the player they will automatically hit, but you see, they don't exactly hit you. An example would be if I snuck up on an individual with kill aura, they were pressing Q to try and pick up items because their inventory was full, once I get behind them they start to hit away from me but then turn to me themselves where they're locked on me and only hit me. It's why aimbots are a loved asset to better their experience with this hack.
If you see a player automatically hitting when you get close it might be kill aura. Something to do, get close, back up, if they stop hitting go back in and if they start hitting again it's Kill aura.
-Aimbots
Aimbots are also a self explanatory hack. It's a bot part of a lot of famous hacked clients that aims at the nearest player, or mob. It locks on the head and only the head, to gain more damage from outcomes and because it's set like that. It locks on you and doesn't stop aiming until you leave the radius. Kill aura is an asset to this hack because it aims and also hits to the nearest player or to multiple players closing in on the hacker, it's why you sometimes see hackers spazzing their heads around, it's because the aimbot used with the kill aura is aimed at the heads and is precisely set to only hit the head.
If you see players aiming precisely to other players headshot might be aimbots. Something to note, they sometimes snap their heads up if you go up higher and keep the movement wherever you go.
-Anti Knockback
Anti Knockback is quite a popular hack like Kill aura, it explains itself like many of the ones listed above. Pretty much it's infinite slowness. It's why you'd need to get a speed potion to get a bit faster outcomes. Anti Knockback is a hack that prevents an individual from being knocked back, it's commonly seen on SkyWars, mostly because when you bridge across you sometimes get knocked off by snowballs or arrows.
If you notice this on any server and you continuously hit or see another player hitting them and they aren't being knocked back it's anti knockback. Make sure the user isn't lagging, if you see the player moving and not being knocked back it's easier to tell. If they're stuck in one place they either lagged out or their entity is stuck.
You may also notice users get slight jumps when cornered, if you don't see them being slightly pushed up when you hit them it's anti Knockback.
You can not accurately determine this if the server is 1.8 with NCP on.
-Speed hacks
Speed hacks used to be popular, I mostly see users early in the Mornings for me, or on other servers. Speed hacks are pretty much infinite speed boosts, like speed potions, you could go to really high enchants such as Speed III and keep it infinitely. When you see a player going extremely fast, you might have experience with commands such as /speed 5 or /speed 7. Basically this like that, and you go really fast. It's annoying when they escape you or if they start to go around you hitting you until you die.
If you see this happen report it immediately to the forums, it isn't hard to identify, if you see them going really fast it's speed hacks.
-Bow aimbots
You see bow aimbots are still used, on SkyWars and on Kit-PvP. When you see players bowing and almost never missing it might be bow aimbots, what they do is kind of like aimbots, they aim to the nearest player and release or you release and it hits. Bow aimbots are made effortlessly but they do indeed miss because of players moving or running. What you would do in a scenario like this is sneak up behind them and if they snap there heads at you and release the arrow, it's bow aimbots.
-Auto Disconnect (also known as auto dc)
Auto disconnect is self explanatory,you automatically disconnect when the hack registers you're low on health, you're kicked with a message and return unharmed.
If you see a player combat tagged or being hit and they suddenly disconnect without any items dropping, wait and see if they return with any effects such as fire. Records if you see this and report it to the forums.
-Auto Armor
Auto Armor is for those servers with grapples and involves a lot of Armor to got down and pvp such as Factions or OP Factions. Usually it takes a little pause for you to press your E button and put Armor on. Not for this hacked client, they are either running or still pvping and the hack registers the strongest piece of Armor to replace the missing Armor slot.
If you see players not pausing to change their Armor and are running to still fighting and they automatically put on Armor when one of their Armor items break it is Auto Armor and report it to higher officials on team speak or report it on the forums.
-Criticals
Criticals are a hack where you one shot somebody with a stone sword or another sword, they do severe damage to players with stronger Armor then them. Usually it takes more then 3 hits to kill someone with weaker Armor then you or equal Armor as you, with equal Armor it takes maybe 6-8 hits to have them run or heal themselves. Not for them, they may swing 2 hits at you and you are dead. They are hard to see, but if a player jumps a little everytime they land a hit its criticals.Side note added by Lexi. To clarify the jumps are not as high as standard minecraft jumps. They are only possible with this hack, and only lift the player a very small amount off the ground. If you see someone jumping abnormally like this when hitting you, it's criticals
If you see a player doing more damage to you or one shoting diamond armoured players it might be Criticals. Try not to mistake it with strength, strength gives you a boost with damage but definitely takes at least 4-5 hits to kill someone with equal Armor.
-Regeneration Hacks
Regen Hacks are better known for it, if you see a player being healed without using a health potion it might be Regeneration hacks. What this type of hack does is to keep healing you until you get full health again, a player might be from 2 hearts and quickly go back to full health. Examples would be someone with no Armor, or weaker Armor then you, you notice how it would be quicker for you to just finish them off, you need to keep clicking for them to finally die, you may notice it took longer then expected.
An example would be on Factions, you see damage indicators are still there, [or so I believe are still there] you may notice a player might go from 4-20 health quickly when they didn't use anything to regenerate themselves with. If you see them lasting longer then usual report it for regeneration hacks if no form of healing was used while fighting.
-Tracers
Tracers are a hack that make a coloured line to the closest player coming to you or the closest so players, it may go to a high level such as 10 and show lines to all of them, the individual could be underground and a line suddenly goes up to a nearby player.
If you sneak up on a player or are sneaking and shoe no sign of your whereabouts and they quickly find you or dig down to you, it's tracers.
If you're a staff member try to get up to a high level, maybe 7 higher then the player and if they look up it's tracers, take quick action. Remember to stay out of the radius of the player because they might be using 1st player mode.
~Original credits to xJasperMx and DestructPvp for making this thread.
-Kill aura
One of the most famous hacks is Kill aura. You see Kill aura is a self explanatory type of hack. It's an aura where once you enter a certain radius of the player they will automatically hit, but you see, they don't exactly hit you. An example would be if I snuck up on an individual with kill aura, they were pressing Q to try and pick up items because their inventory was full, once I get behind them they start to hit away from me but then turn to me themselves where they're locked on me and only hit me. It's why aimbots are a loved asset to better their experience with this hack.
If you see a player automatically hitting when you get close it might be kill aura. Something to do, get close, back up, if they stop hitting go back in and if they start hitting again it's Kill aura.
-Aimbots
Aimbots are also a self explanatory hack. It's a bot part of a lot of famous hacked clients that aims at the nearest player, or mob. It locks on the head and only the head, to gain more damage from outcomes and because it's set like that. It locks on you and doesn't stop aiming until you leave the radius. Kill aura is an asset to this hack because it aims and also hits to the nearest player or to multiple players closing in on the hacker, it's why you sometimes see hackers spazzing their heads around, it's because the aimbot used with the kill aura is aimed at the heads and is precisely set to only hit the head.
If you see players aiming precisely to other players headshot might be aimbots. Something to note, they sometimes snap their heads up if you go up higher and keep the movement wherever you go.
-Anti Knockback
Anti Knockback is quite a popular hack like Kill aura, it explains itself like many of the ones listed above. Pretty much it's infinite slowness. It's why you'd need to get a speed potion to get a bit faster outcomes. Anti Knockback is a hack that prevents an individual from being knocked back, it's commonly seen on SkyWars, mostly because when you bridge across you sometimes get knocked off by snowballs or arrows.
If you notice this on any server and you continuously hit or see another player hitting them and they aren't being knocked back it's anti knockback. Make sure the user isn't lagging, if you see the player moving and not being knocked back it's easier to tell. If they're stuck in one place they either lagged out or their entity is stuck.
You may also notice users get slight jumps when cornered, if you don't see them being slightly pushed up when you hit them it's anti Knockback.
You can not accurately determine this if the server is 1.8 with NCP on.
-Speed hacks
Speed hacks used to be popular, I mostly see users early in the Mornings for me, or on other servers. Speed hacks are pretty much infinite speed boosts, like speed potions, you could go to really high enchants such as Speed III and keep it infinitely. When you see a player going extremely fast, you might have experience with commands such as /speed 5 or /speed 7. Basically this like that, and you go really fast. It's annoying when they escape you or if they start to go around you hitting you until you die.
If you see this happen report it immediately to the forums, it isn't hard to identify, if you see them going really fast it's speed hacks.
-Bow aimbots
You see bow aimbots are still used, on SkyWars and on Kit-PvP. When you see players bowing and almost never missing it might be bow aimbots, what they do is kind of like aimbots, they aim to the nearest player and release or you release and it hits. Bow aimbots are made effortlessly but they do indeed miss because of players moving or running. What you would do in a scenario like this is sneak up behind them and if they snap there heads at you and release the arrow, it's bow aimbots.
-Auto Disconnect (also known as auto dc)
Auto disconnect is self explanatory,you automatically disconnect when the hack registers you're low on health, you're kicked with a message and return unharmed.
If you see a player combat tagged or being hit and they suddenly disconnect without any items dropping, wait and see if they return with any effects such as fire. Records if you see this and report it to the forums.
-Auto Armor
Auto Armor is for those servers with grapples and involves a lot of Armor to got down and pvp such as Factions or OP Factions. Usually it takes a little pause for you to press your E button and put Armor on. Not for this hacked client, they are either running or still pvping and the hack registers the strongest piece of Armor to replace the missing Armor slot.
If you see players not pausing to change their Armor and are running to still fighting and they automatically put on Armor when one of their Armor items break it is Auto Armor and report it to higher officials on team speak or report it on the forums.
-Criticals
Criticals are a hack where you one shot somebody with a stone sword or another sword, they do severe damage to players with stronger Armor then them. Usually it takes more then 3 hits to kill someone with weaker Armor then you or equal Armor as you, with equal Armor it takes maybe 6-8 hits to have them run or heal themselves. Not for them, they may swing 2 hits at you and you are dead. They are hard to see, but if a player jumps a little everytime they land a hit its criticals.Side note added by Lexi. To clarify the jumps are not as high as standard minecraft jumps. They are only possible with this hack, and only lift the player a very small amount off the ground. If you see someone jumping abnormally like this when hitting you, it's criticals
If you see a player doing more damage to you or one shoting diamond armoured players it might be Criticals. Try not to mistake it with strength, strength gives you a boost with damage but definitely takes at least 4-5 hits to kill someone with equal Armor.
-Regeneration Hacks
Regen Hacks are better known for it, if you see a player being healed without using a health potion it might be Regeneration hacks. What this type of hack does is to keep healing you until you get full health again, a player might be from 2 hearts and quickly go back to full health. Examples would be someone with no Armor, or weaker Armor then you, you notice how it would be quicker for you to just finish them off, you need to keep clicking for them to finally die, you may notice it took longer then expected.
An example would be on Factions, you see damage indicators are still there, [or so I believe are still there] you may notice a player might go from 4-20 health quickly when they didn't use anything to regenerate themselves with. If you see them lasting longer then usual report it for regeneration hacks if no form of healing was used while fighting.
-Tracers
Tracers are a hack that make a coloured line to the closest player coming to you or the closest so players, it may go to a high level such as 10 and show lines to all of them, the individual could be underground and a line suddenly goes up to a nearby player.
If you sneak up on a player or are sneaking and shoe no sign of your whereabouts and they quickly find you or dig down to you, it's tracers.
If you're a staff member try to get up to a high level, maybe 7 higher then the player and if they look up it's tracers, take quick action. Remember to stay out of the radius of the player because they might be using 1st player mode.
~Original credits to xJasperMx and DestructPvp for making this thread.