汇编实现NtCreateFile
时间: 2024-05-04 11:22:32 浏览: 9
汇编实现NtCreateFile需要使用Windows的系统调用,可以使用以下代码实现:
```
.MODEL FLAT, STDCALL
OPTION CASMAP:NONE
EXTERN NtCreateFile:PROC
EXTERN RtlInitUnicodeString:PROC
EXTERN ZwClose:PROC
EXTERN ZwWriteFile:PROC
.DATA
FileName DB "C:\example.txt", 0
String DW 0,0,0,0,0,0,0,0
ObjectAttr OBJECT_ATTRIBUTES <>
IOStatusBlock IO_STATUS_BLOCK <>
FileHandle HANDLE ?
FileBuffer DB "Hello, world!", 0AH, 0
.CODE
PUBLIC main
main PROC
sub rsp,28H ; allocate stack space for local variables
; initialize the object attributes
mov rcx,OFFSET FileName
call RtlInitUnicodeString
mov ObjectAttr.Length,SIZEOF(OBJECT_ATTRIBUTES)
mov ObjectAttr.ObjectName,rax
xor ObjectAttr.Attributes,ObjectAttr.Attributes
xor ObjectAttr.RootDirectory,ObjectAttr.RootDirectory
xor ObjectAttr.SecurityDescriptor,ObjectAttr.SecurityDescriptor
xor ObjectAttr.SecurityQualityOfService,ObjectAttr.SecurityQualityOfService
; open the file for writing
mov rcx,OFFSET FileHandle
lea rdx,ObjectAttr
mov r8,FILE_APPEND_DATA
xor r9,r9
xor r10,r10
mov eax,0x00000120 ; NTCreateFile syscall number
syscall
; check for errors
test eax,eax
jz write_file
; close the file handle and exit
mov rcx,FileHandle
mov eax,0x00000006 ; ZwClose syscall number
syscall
xor eax,eax
add rsp,28H ; deallocate stack space
ret
write_file:
; write to the file
mov rcx,FileHandle
xor rdx,rdx
xor r8,r8
lea r9,FileBuffer
mov rax,SIZEOF(FileBuffer)
mov eax,0x0000005e ; ZwWriteFile syscall number
syscall
; check for errors
test eax,eax
jz close_file
; close the file handle and exit
mov rcx,FileHandle
mov eax,0x00000006 ; ZwClose syscall number
syscall
xor eax,eax
add rsp,28H ; deallocate stack space
ret
close_file:
; close the file handle and exit
mov rcx,FileHandle
mov eax,0x00000006 ; ZwClose syscall number
syscall
xor eax,eax
add rsp,28H ; deallocate stack space
ret
END main
```
这段代码先调用了RtlInitUnicodeString函数初始化了文件名,然后使用NtCreateFile系统调用打开了文件,接着使用ZwWriteFile系统调用向文件写入数据,最后使用ZwClose系统调用关闭文件句柄。在实际使用中,需要将这段代码编译成二进制形式,并通过LoadLibrary和GetProcAddress函数加载并调用。