This is part two of the Simple x64 XOR Shellcode Encoder / Loader paper that adds in simple obfuscation.
You can download it from the following link: https://packetstormsecurity.com/files/download/104751/x64_xor_encoder_2.txt
Source: https://packetstormsecurity.com/files/104751/Simple-x64-XOR-Shellcode-Obfuscation.html