Помогите Не могу изучить логи, не пойму как взломали.

Здравствуйте. В обед я зашёл посмотреть логи, и там вот этот код (в спойлере). Я новый в создании и не могу понять каким способом меня взломали и какие команды нужно запретить. Пожалуйста.

Спойлер: Отрывок лога, где происходит действие.

[16:13:34] [Server thread/INFO]: Шахта была успешно обновлена.
[16:13:36] [Server thread/INFO]: DizZY issued server command: /skull bukva
[16:13:48] [Server thread/INFO]: DizZY lost connection: Disconnected
[16:14:34] [Server thread/INFO]: >>[Внимание!] Весь мусор будет удалён через 60 секунд!
[16:15:24] [Server thread/INFO]: >>[Внимание!] Весь мусор будет удалён через 10 секунд!
[16:15:34] [Server thread/INFO]: >>[Внимание!] Мусора было очищено 2 содержимого!
[16:15:41] [Thread-30/INFO]: UUID of player JokkerX is 0b3234eb-b95a-3147-98d8-d2677956b07c
[16:15:41] [pool-9-thread-1/INFO]: Создаю пустой конфигурационный файл: /home/srv7389/plugins/Essentials/userdata/c303a401-9eb6-3dcb-98f8-a214142fc165.yml
[16:15:41] [Server thread/INFO]: [Essentials] Found new UUID for JokkerX. Replacing c303a401-9eb6-3dcb-98f8-a214142fc165 with 0b3234eb-b95a-3147-98d8-d2677956b07c
[16:15:41] [Server thread/INFO]: JokkerX[/185.31.165.83:2099] logged in with entity id 26206 at ([world]-6024.5, 32.0, 2324.5)
[16:15:41] [pool-9-thread-1/INFO]: Создаю пустой конфигурационный файл: /home/srv7389/plugins/Essentials/userdata/0b3234eb-b95a-3147-98d8-d2677956b07c.yml
[16:15:56] [Server thread/INFO]: [AuthMe] JokkerX registered 185.31.165.83
[16:15:58] [Server thread/INFO]: §9(игрок§9) §fJokkerX has just earned the achievement [Taking Inventory]
[16:16:11] [Server thread/INFO]: JokkerX issued server command: /hack
[16:16:15] [Server thread/INFO]: JokkerX issued server command: /free
[16:16:17] [Server thread/INFO]: JokkerX issued server command: /fp
[16:16:48] [Server thread/INFO]: (Ｌ) [Игрок] JokkerX: D
[16:16:52] [Server thread/INFO]: (Ｌ) [Игрок] JokkerX: в
[16:16:56] [Server thread/INFO]: JokkerX issued server command: /rg info
[16:18:05] [Server thread/INFO]: JokkerX lost connection: Internal Exception: java.io.IOException: Error while read(...): Connection reset by peer
[16:18:17] [Thread-32/INFO]: UUID of player /DIZZY is e4ad9161-b96f-3353-b5f2-90c917927266
[16:18:17] [Server thread/INFO]: Disconnecting com.mojang.authlib.GameProfile@2ffb5491[id=e4ad9161-b96f-3353-b5f2-90c917927266,name=/DIZZY,properties={},legacy=false] (/185.31.165.83:2479): §cВаш ник содержит недопустимые символы. Разрешено символов: [a-zA-Z0-9_]*
[16:18:17] [Server thread/INFO]: com.mojang.authlib.GameProfile@2ffb5491[id=e4ad9161-b96f-3353-b5f2-90c917927266,name=/DIZZY,properties={},legacy=false] (/185.31.165.83:2479) lost connection: §cВаш ник содержит недопустимые символы. Разрешено символов: [a-zA-Z0-9_]*
[16:19:13] [Thread-33/INFO]: UUID of player DIZZY is 6f3328f2-c6d3-35b1-bef0-8518631867b4
[16:19:13] [Server thread/INFO]: [Essentials] Found new UUID for DIZZY. Replacing b07ffa69-af9a-3a12-acfa-c5b367477530 with 6f3328f2-c6d3-35b1-bef0-8518631867b4
[16:19:13] [Server thread/INFO]: DIZZY[/185.31.165.83:3856] logged in with entity id 46581 at ([world]-6024.5, 34.0, 2321.5)
[16:19:13] [pool-9-thread-1/INFO]: Создаю пустой конфигурационный файл: /home/srv7389/plugins/Essentials/userdata/6f3328f2-c6d3-35b1-bef0-8518631867b4.yml
[16:19:14] [Server thread/ERROR]: [HolographicDisplays] Unhandled exception number 256 occured in onPacketSending(PacketEvent) for HolographicDisplays
java.lang.NoSuchMethodError: com.comphenix.protocol.wrappers.WrappedWatchableObject.deepClone()Lcom/comphenix/protocol/wrappers/WrappedWatchableObject;
at com.gmail.filoghost.holographicdisplays.bridge.protocollib.ProtocolLibHook$1.onPacketSending(ProtocolLibHook.java:153) ~[HolographicDisplays.jar:?]
at com.comphenix.protocol.injector.SortedPacketListenerList.invokeSendingListener(SortedPacketListenerList.java:195) [ProtocolLib.jar:4.4.0-b421]
at com.comphenix.protocol.injector.SortedPacketListenerList.invokePacketSending(SortedPacketListenerList.java:149) [ProtocolLib.jar:4.4.0-b421]
at com.comphenix.protocol.injector.PacketFilterManager.handlePacket(PacketFilterManager.java:588) [ProtocolLib.jar:4.4.0-b421]
at com.comphenix.protocol.injector.PacketFilterManager.invokePacketSending(PacketFilterManager.java:564) [ProtocolLib.jar:4.4.0-b421]
at com.comphenix.protocol.injector.netty.ProtocolInjector.packetQueued(ProtocolInjector.java:338) [ProtocolLib.jar:4.4.0-b421]
at com.comphenix.protocol.injector.netty.ProtocolInjector.onPacketSending(ProtocolInjector.java:298) [ProtocolLib.jar:4.4.0-b421]
at com.comphenix.protocol.injector.netty.ChannelInjector.processSending(ChannelInjector.java:367) [ProtocolLib.jar:4.4.0-b421]
at com.comphenix.protocol.injector.netty.ChannelInjector.access$800(ChannelInjector.java:66) [ProtocolLib.jar:4.4.0-b421]
at com.comphenix.protocol.injector.netty.ChannelInjector$3.handleScheduled(ChannelInjector.java:332) [ProtocolLib.jar:4.4.0-b421]
at com.comphenix.protocol.injector.netty.ChannelInjector$3.onMessageScheduled(ChannelInjector.java:302) [ProtocolLib.jar:4.4.0-b421]
at com.comphenix.protocol.injector.netty.ChannelProxy$2.schedulingRunnable(ChannelProxy.java:127) [ProtocolLib.jar:4.4.0-b421]
at com.comphenix.protocol.injector.netty.EventLoopProxy.execute(EventLoopProxy.java:95) [ProtocolLib.jar:4.4.0-b421]
at net.minecraft.server.v1_8_R3.NetworkManager.a(NetworkManager.java:192) [Spigot.jar:git-Spigot-d97e08b-880a532]
at net.minecraft.server.v1_8_R3.NetworkManager.handle(NetworkManager.java:141) [Spigot.jar:git-Spigot-d97e08b-880a532]
at net.minecraft.server.v1_8_R3.PlayerConnection.sendPacket(PlayerConnection.java:907) [Spigot.jar:git-Spigot-d97e08b-880a532]
at net.minecraft.server.v1_8_R3.EntityTrackerEntry.broadcast(EntityTrackerEntry.java:280) [Spigot.jar:git-Spigot-d97e08b-880a532]
at net.minecraft.server.v1_8_R3.EntityTrackerEntry.broadcastIncludingSelf(EntityTrackerEntry.java:286) [Spigot.jar:git-Spigot-d97e08b-880a532]
at net.minecraft.server.v1_8_R3.EntityTrackerEntry.b(EntityTrackerEntry.java:253) [Spigot.jar:git-Spigot-d97e08b-880a532]
at net.minecraft.server.v1_8_R3.EntityTrackerEntry.track(EntityTrackerEntry.java:179) [Spigot.jar:git-Spigot-d97e08b-880a532]
at net.minecraft.server.v1_8_R3.EntityTracker.updatePlayers(EntityTracker.java:177) [Spigot.jar:git-Spigot-d97e08b-880a532]
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:802) [Spigot.jar:git-Spigot-d97e08b-880a532]
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [Spigot.jar:git-Spigot-d97e08b-880a532]
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:653) [Spigot.jar:git-Spigot-d97e08b-880a532]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:556) [Spigot.jar:git-Spigot-d97e08b-880a532]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_221]
[16:19:26] [Server thread/INFO]: DIZZY issued server command: /reg
[16:19:34] [Server thread/INFO]: >>[Внимание!] Весь мусор будет удалён через 60 секунд!
[16:19:37] [Server thread/INFO]: DIZZY issued server command: /login
[16:19:41] [Server thread/INFO]: [AuthMe] DIZZY used the wrong password
[16:19:48] [Server thread/INFO]: [AuthMe] DIZZY used the wrong password
[16:19:54] [Server thread/INFO]: [AuthMe] DIZZY used the wrong password
[16:19:56] [Server thread/INFO]: §9(игрок§9) §fDIZZY has just earned the achievement [Taking Inventory]
[16:20:05] [Server thread/INFO]: DIZZY issued server command: /op
[16:20:07] [Server thread/INFO]: DIZZY issued server command: /gm 1
[16:20:17] [Server thread/INFO]: DIZZY issued server command: /op JokkerX
[16:20:18] [Server thread/INFO]: DIZZY issued server command: /op JokkerX
[16:20:19] [Server thread/INFO]: DIZZY issued server command: /op JokkerX
[16:20:21] [Server thread/INFO]: DIZZY issued server command: /l
[16:20:23] [Server thread/INFO]: DIZZY issued server command: /op JokkerX
[16:20:24] [Server thread/INFO]: >>[Внимание!] Весь мусор будет удалён через 10 секунд!
[16:20:28] [Server thread/INFO]: DIZZY issued server command: /authme
[16:20:32] [Server thread/INFO]: DIZZY issued server command: /authme:l
[16:20:34] [Server thread/INFO]: >>[Внимание!] Мусора было очищено 9 содержимого!
[16:20:38] [Server thread/INFO]: [AuthMe] DIZZY used the wrong password
[16:20:41] [Server thread/INFO]: [AuthMe] DIZZY used the wrong password
[16:20:45] [Server thread/INFO]: [AuthMe] DIZZY used the wrong password
[16:20:48] [Server thread/INFO]: [AuthMe] DIZZY used the wrong password
[16:20:49] [Server thread/INFO]: [AuthMe] DIZZY used the wrong password
[16:20:51] [Server thread/INFO]: [AuthMe] DIZZY used the wrong password
[16:20:52] [Server thread/INFO]: [AuthMe] DIZZY used the wrong password
[16:20:53] [Server thread/INFO]: [AuthMe] Set DIZZY to gamemode: SURVIVAL
[16:20:53] [Server thread/INFO]: DIZZY lost connection: Время ожидания логирования истекло.
[16:20:53] [Server thread/WARN]: handleDisconnection() called twice
[16:21:38] [Thread-34/INFO]: UUID of player /DIZZY is e4ad9161-b96f-3353-b5f2-90c917927266
[16:21:38] [Server thread/INFO]: Disconnecting com.mojang.authlib.GameProfile@3c98ed89[id=e4ad9161-b96f-3353-b5f2-90c917927266,name=/DIZZY,properties={},legacy=false] (/185.31.165.83:2063): §cВаш ник содержит недопустимые символы. Разрешено символов: [a-zA-Z0-9_]*
[16:21:38] [Server thread/INFO]: com.mojang.authlib.GameProfile@3c98ed89[id=e4ad9161-b96f-3353-b5f2-90c917927266,name=/DIZZY,properties={},legacy=false] (/185.31.165.83:2063) lost connection: §cВаш ник содержит недопустимые символы. Разрешено символов: [a-zA-Z0-9_]*
[16:22:34] [Server thread/INFO]: Шахта была успешно обновлена.

я вышел в строке [16:13:48] перед этим написав /skull bukva и я дисконектнулся. После этого я не заходил. А мой ник почему-то там писал команды. Заранее спасибо!)