Most of us have never thought that if a tool has a lot of backdoor (Most files for free with a lot of backdoor). They use encrypted in the installation of a backdoor method, for example using base64 facilities, MD5, Zend Guard or using array. Here is a little light for reading tutorials groove array from php script.

The sample code is bellow :

$ar=array(“0″=>”j”,”1″=>”i”,”2″=>”a”,”3″=>”n”,”4″= >”b”,”5″=>”h”,”6″=>”g”,”7″=>”.”,”8″=>”t”,”9″=>”e”, “10″=>”@”,”11″=>”k”,”12″=>”o”,”13″=>”m”,”14″=>”d”);
$cc=$ar['4'].$ar['2'].$ar['0'].$ar['1'].$ar['3'].$ar['6'].$ar['2'].$ar['3'].$ar['7'].$ar['8'].$ar['9']. $ar['3'].$ar['6'].$ar['1'].$ar['11'].$ar['10'].$ar['14'].$ar['12'].$ar['13'].$ar['1'].$ar['3'].$ar['7'].”c”. $ar['12'].$ar['13'];

Reading of that code is just matches variable $cc with variable in $ar. First $ar['4'], Look array number 4 in variable $ar, it’s “b”. Next $ar['2'] is “a” and so on.
The results from the decomposition of the array is : bajingan.tengik@domain.com
Usually this sort encrypts used to send information via email.