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Example6.2

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Example 6.2: Creating a Win32 Process #include “ntdll.h”
#include <stdio.h>
namespace NT {
extern “C” {
NTSTATUS
NTAPI
CsrClientCallServer(
IN PVOID Message,
IN PVOID,
IN ULONG Opcode,
IN ULONG Size
);
}
}
VOID InformCsrss(HANDLE hProcess, HANDLE hThread, ULONG pid, ULONG tid)
{
struct CSRSS_MESSAGE {
ULONG Unknown1;
ULONG Opcode;
ULONG Status;
ULONG Unknown2;
};
struct {
NT::PORT_MESSAGE PortMessage;
CSRSS_MESSAGE CsrssMessage;
PROCESS_INFORMATION ProcessInformation;
NT::CLIENT_ID Debugger;
ULONG CreationFlags;
ULONG VdmInfo[2];
} csrmsg = {{0}, {0}, {hProcess, hThread, pid, tid}, {0}, 0, {0}};
NT::CsrClientCallServer(&csrmsg, 0, 0x10000, 0x24);
}
PWSTR CopyEnvironment(HANDLE hProcess)
{
PWSTR env = GetEnvironmentStringsW();
ULONG n;
for (n = 0; env[n] != 0; n += wcslen(env + n) + 1) ; n *= sizeof *env;
ULONG m = n;
PVOID p = 0;
NT::ZwAllocateVirtualMemory(hProcess, &p, 0, &m,
MEM_COMMIT, PAGE_READWRITE);
NT::ZwWriteVirtualMemory(hProcess, p, env, n, 0);
return PWSTR(p);
}
VOID CreateProcessParameters(HANDLE hProcess, NT::PPEB Peb,
NT::PUNICODE_STRING ImageFile)
{
NT::PPROCESS_PARAMETERS pp;
NT::RtlCreateProcessParameters(&pp, ImageFile, 0, 0, 0, 0, 0, 0, 0, 0);
pp->Environment = CopyEnvironment(hProcess);
ULONG n = pp->Size;
PVOID p = 0;
NT::ZwAllocateVirtualMemory(hProcess, &p, 0, &n,
MEM_COMMIT, PAGE_READWRITE);
NT::ZwWriteVirtualMemory(hProcess, p, pp, pp->Size, 0);
NT::ZwWriteVirtualMemory(hProcess, PCHAR(Peb) + 0x10, &p, sizeof p, 0);
NT::RtlDestroyProcessParameters(pp);
}
int exec(NT::PUNICODE_STRING name)
{
HANDLE hProcess, hThread, hSection, hFile;
NT::OBJECT_ATTRIBUTES oa = {sizeof oa, 0, name, OBJ_CASE_INSENSITIVE}; NT::IO_STATUS_BLOCK iosb;
NT::ZwOpenFile(&hFile, FILE_EXECUTE | SYNCHRONIZE, &oa, &iosb,
FILE_SHARE_READ, FILE_SYNCHRONOUS_IO_NONALERT);
oa.ObjectName = 0;
NT::ZwCreateSection(&hSection, SECTION_ALL_ACCESS, &oa, 0,
PAGE_EXECUTE, SEC_IMAGE, hFile);
NT::ZwClose(hFile);
NT::ZwCreateProcess(&hProcess, PROCESS_ALL_ACCESS, &oa,
NtCurrentProcess(), TRUE, hSection, 0, 0);
NT::SECTION_IMAGE_INFORMATION sii;
NT::ZwQuerySection(hSection, NT::SectionImageInformation,
&sii, sizeof sii, 0);
NT::ZwClose(hSection);
NT::USER_STACK stack = {0};
ULONG n = sii.StackReserve;
NT::ZwAllocateVirtualMemory(hProcess, &stack.ExpandableStackBottom, 0, &n,
MEM_RESERVE, PAGE_READWRITE);
stack.ExpandableStackBase = PCHAR(stack.ExpandableStackBottom)
+ sii.StackReserve;
stack.ExpandableStackLimit = PCHAR(stack.ExpandableStackBase)
- sii.StackCommit;
n = sii.StackCommit + PAGE_SIZE;
PVOID p = PCHAR(stack.ExpandableStackBase) - n;
NT::ZwAllocateVirtualMemory(hProcess, &p, 0, &n,
MEM_COMMIT, PAGE_READWRITE);
ULONG x; n = PAGE_SIZE;
NT::ZwProtectVirtualMemory(hProcess, &p, &n,
PAGE_READWRITE | PAGE_GUARD, &x);
NT::CONTEXT context = {CONTEXT_FULL};
context.SegGs = 0;
context.SegFs = 0x38;
context.SegEs = 0x20;
context.SegDs = 0x20;
context.SegSs = 0x20;
context.SegCs = 0x18;
context.EFlags = 0x3000;
context.Esp = ULONG(stack.ExpandableStackBase) - 4;
context.Eip = ULONG(sii.EntryPoint);
NT::CLIENT_ID cid;
NT::ZwCreateThread(&hThread, THREAD_ALL_ACCESS, &oa,
hProcess, &cid, &context, &stack, TRUE);
NT::PROCESS_BASIC_INFORMATION pbi;
NT::ZwQueryInformationProcess(hProcess, NT::ProcessBasicInformation,
&pbi, sizeof pbi, 0);
CreateProcessParameters(hProcess, pbi.PebBaseAddress, name);
InformCsrss(hProcess, hThread,
ULONG(cid.UniqueProcess), ULONG(cid.UniqueThread));
NT::ZwResumeThread(hThread, 0);
NT::ZwClose(hProcess);
NT::ZwClose(hThread);
return int(cid.UniqueProcess);
}
#pragma com ment(linker, “-entry:wmainCRTStartup”)
extern “C”
int wmain(int argc, wchar_t *argv[])
{
NT::UNICODE_STRING ImageFile;
NT::RtlInitUnicodeString(&ImageFile, argv[1]); exec(&ImageFile);
return 0;
}。

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