SpoofMe Backdoor – The backdoor is composed of 3 parts. The client, the server, and a php script. The client is used to send spoofed udp packets to the victim. Theses packets contains the commands encrypted with the base64 algorithm. The server listens on a UDP port. When it receives a command, it decrypts it, executes it and encodes the output in base64. The result is sent in a HTTP (POST) packet to the php script called shell_output.php.
You can download it from the following link: https://packetstormsecurity.com/files/download/45175/SpoofMe_backdoor.tar.bz2
Source: https://packetstormsecurity.com/files/45175/SpoofMe_backdoor.tar.bz2.html