This is a backdoor PHP shell from ITSecTeam. It can execute system commands, bypass various controls, connects to common databases and edits files and directories.
You can download it from the following link: https://packetstormsecurity.com/files/download/95404/itsecteam_shell_2.1.rar
Source: https://packetstormsecurity.com/files/95404/ITSecTeam-Shell-2.1.html