def register_io_in(self):
in_ioctl = x86.MultipleInstr()
INPUT_BUFFER_PORT = x86.mem('[ECX + 4]')
INPUT_BUFFER_SIZE = x86.mem('[ECX]')
in_ioctl += x86.Cmp(self.IO_STACK_INPUT_BUFFER_LEN, 8) # size indicator / port
in_ioctl += x86.Jnz(":FAIL")
in_ioctl += x86.Cmp(self.IO_STACK_OUPUT_BUFFER_LEN, 0x4)
in_ioctl += x86.Jnz(":FAIL")
in_ioctl += x86.Mov('ECX', self.IO_STACK_INPUT_BUFFER)
in_ioctl += x86.Mov('EDX', INPUT_BUFFER_PORT)
in_ioctl += x86.Mov('ECX', INPUT_BUFFER_SIZE)
in_ioctl += x86.Xor('EAX', 'EAX')
in_ioctl += x86.Cmp('ECX', 0x1)
in_ioctl += x86.Jnz(":IN_2_OR_4")
in_ioctl += x86.In('AL', 'DX')
in_ioctl += x86.Jmp(':SUCCESS')
in_ioctl += x86.Label(":IN_2_OR_4")
in_ioctl += x86.Cmp('ECX', 0x2)
in_ioctl += x86.Jnz(":IN_4")
in_ioctl += x86.In('AX', 'DX')
in_ioctl += x86.Jmp(':SUCCESS')
in_ioctl += x86.Label(":IN_4")
in_ioctl += x86.In('EAX', 'DX')
in_ioctl += x86.Label(":SUCCESS")
in_ioctl += x86.Mov('EDX', self.IRP_OUTPUT_BUFFER)
in_ioctl += x86.Mov(x86.mem('[EDX]'), 'EAX')
in_ioctl += x86.Xor('EAX', 'EAX')
in_ioctl += x86.Ret()
in_ioctl += x86.Label(":FAIL")
in_ioctl += x86.Mov('EAX', 0x0C000000D)
in_ioctl += x86.Ret()
self.upgrade_driver_add_new_ioctl_handler(DU_IN_IOCTL, in_ioctl.get_code())
def register_io_out(self):
out_ioctl = x86.MultipleInstr()
INPUT_BUFFER_SIZE = x86.mem('[ECX]')
INPUT_BUFFER_PORT = x86.mem('[ECX + 4]')
INPUT_BUFFER_VALUE = x86.mem('[ECX + 8]')
out_ioctl += x86.Cmp(self.IO_STACK_INPUT_BUFFER_LEN, 0xc) # size indicator / port / value
out_ioctl += x86.Jnz(":FAIL")
out_ioctl += x86.Mov('ECX', self.IO_STACK_INPUT_BUFFER)
out_ioctl += x86.Mov('EDX', INPUT_BUFFER_PORT)
out_ioctl += x86.Mov('EAX', INPUT_BUFFER_VALUE)
out_ioctl += x86.Mov('ECX', INPUT_BUFFER_SIZE)
out_ioctl += x86.Cmp('ECX', 0x1)
out_ioctl += x86.Jnz(":OUT_2_OR_4")
out_ioctl += x86.Out('DX', 'AL')
out_ioctl += x86.Jmp(':SUCCESS')
out_ioctl += x86.Label(":OUT_2_OR_4")
out_ioctl += x86.Cmp('ECX', 0x2)
out_ioctl += x86.Jnz(":OUT_4")
out_ioctl += x86.Out('DX', 'AX')
out_ioctl += x86.Jmp(':SUCCESS')
out_ioctl += x86.Label(":OUT_4")
out_ioctl += x86.Out('DX', 'EAX')
out_ioctl += x86.Label(":SUCCESS")
out_ioctl += x86.Xor('EAX', 'EAX')
out_ioctl += x86.Ret()
out_ioctl += x86.Label(":FAIL")
out_ioctl += x86.Mov('EAX', 0x0C000000D)
out_ioctl += x86.Ret()
self.upgrade_driver_add_new_ioctl_handler(DU_OUT_IOCTL, out_ioctl.get_code())
def register_kernel_call(self):
# expect in buffer: the address to call and all dword to push on the stack
CCall_IOCTL = x86.MultipleInstr()
CCall_IOCTL += x86.Mov('EAX', self.IO_STACK_INPUT_BUFFER_LEN)
CCall_IOCTL += x86.Cmp('EAX', 0)
CCall_IOCTL += x86.Jz(":FAIL") # Need at least the function to call
CCall_IOCTL += x86.Mov('ECX', self.IO_STACK_INPUT_BUFFER)
CCall_IOCTL += x86.Label(':PUSH_NEXT_ARG')
CCall_IOCTL += x86.Cmp('EAX', 4)
CCall_IOCTL += x86.Jz(":DO_CALL")
CCall_IOCTL += x86.Sub('EAX', 4)
INPUT_BUFFER_NEXT_ARG = x86.create_displacement(base='ECX', index='EAX')
CCall_IOCTL += x86.Mov('EBX', INPUT_BUFFER_NEXT_ARG)
CCall_IOCTL += x86.Push('EBX')
CCall_IOCTL += x86.Jmp(':PUSH_NEXT_ARG')
CCall_IOCTL += x86.Label(":DO_CALL")
CCall_IOCTL += x86.Mov('EAX', x86.mem('[ECX]'))
CCall_IOCTL += x86.Call('EAX')
CCall_IOCTL += x86.Mov('EDX', self.IRP_OUTPUT_BUFFER)
CCall_IOCTL += x86.Mov(x86.mem('[EDX]'), 'EAX')
CCall_IOCTL += x86.Xor('EAX', 'EAX')
CCall_IOCTL += x86.Ret()
CCall_IOCTL += x86.Label(":FAIL")
CCall_IOCTL += x86.Mov('EAX', 0x0C000000D)
CCall_IOCTL += x86.Ret()
self.upgrade_driver_add_new_ioctl_handler(DU_KCALL_IOCTL, CCall_IOCTL.get_code())
def register_alloc_memory(self):
ExAllocatePoolWithTag = self.kdbg.get_symbol_offset("nt!ExAllocatePoolWithTag")
if ExAllocatePoolWithTag is None:
raise ValueError("Could not resolve <ExAllocatePoolWithTag>")
INPUT_BUFFER_ALLOC_TYPE = x86.mem('[ECX]')
INPUT_BUFFER_ALLOC_SIZE = x86.mem('[ECX + 4]')
INPUT_BUFFER_ALLOC_TAG = x86.mem('[ECX + 8]')
Alloc_IOCTL = x86.MultipleInstr()
Alloc_IOCTL += x86.Cmp(self.IO_STACK_INPUT_BUFFER_LEN, 0xc)
Alloc_IOCTL += x86.Jnz(':FAIL')
Alloc_IOCTL += x86.Mov('ECX', self.IO_STACK_INPUT_BUFFER)
Alloc_IOCTL += x86.Mov('EBX', INPUT_BUFFER_ALLOC_TAG)
Alloc_IOCTL += x86.Push('EBX')
Alloc_IOCTL += x86.Mov('EBX', INPUT_BUFFER_ALLOC_SIZE)
Alloc_IOCTL += x86.Push('EBX')
Alloc_IOCTL += x86.Mov('EBX', INPUT_BUFFER_ALLOC_TYPE)
Alloc_IOCTL += x86.Push('EBX')
Alloc_IOCTL += x86.Mov('EAX', ExAllocatePoolWithTag)
Alloc_IOCTL += x86.Call('EAX')
Alloc_IOCTL += x86.Mov('EDX', self.IRP_OUTPUT_BUFFER)
Alloc_IOCTL += x86.Mov(x86.mem('[EDX]'), 'EAX')
Alloc_IOCTL += x86.Xor('EAX', 'EAX')
Alloc_IOCTL += x86.Ret()
Alloc_IOCTL += x86.Label(":FAIL")
Alloc_IOCTL += x86.Mov('EAX', 0x0C000000D)
Alloc_IOCTL += x86.Ret()
self.upgrade_driver_add_new_ioctl_handler(DU_MEMALLOC_IOCTL, Alloc_IOCTL.get_code())
def hook_ntcreatefile(kdbg, ignore_jump_space_check=False):
"""Hook NtCreateFile, the hook write the filename to a shared memory page"""
nt_create_file = kdbg.resolve_symbol("nt!NtCreateFile")
if not ignore_jump_space_check:
# Check that function begin with mov edi, edi for the hook short jump
if kdbg.read_word(nt_create_file) != 0xff8b: # mov edi, edi
print(hex(kdbg.read_word(nt_create_file)))
raise ValueError(
"Cannot hook fonction that doest not begin with <mov edi,edi> (/f to force if hook already in place)"
)
# Check there is 5 bytes free before for the hook long jump
if kdbg.read_virtual_memory(nt_create_file - 5,
5) not in ["\x90" * 5, "\xCC" * 5
]: #NOP * 5 ; INT 3 * 5
print(kdbg.read_virtual_memory(nt_create_file - 5, 5))
raise ValueError(
"Cannot hook fonction that is not prefixed with 5 nop/int 3")
# Allocate memory for the shared buffer kernel<->user
# the format is:
# [addr] -> size of size already taken
# then:
# DWORD string_size
# char[string_size] filename
data_kernel_addr = kdbg.alloc_memory(0x1000)
kdbg.write_pfv_memory(data_kernel_addr, "\x00" * 0x1000)
# Map the shared buffer to userland
data_user_addr = kdbg.map_page_to_userland(data_kernel_addr, 0x1000)
# Allocate memory for the hook
shellcode_addr = kdbg.alloc_memory(0x1000)
# shellcode
shellcode = x86.MultipleInstr()
# Save register
shellcode += x86.Push('EAX')
shellcode += x86.Push('ECX')
shellcode += x86.Push('EDI')
shellcode += x86.Push('ESI')
# Check that there is space remaining, else don't write it
shellcode += x86.Cmp(x86.deref(data_kernel_addr), 0x900)
shellcode += x86.Jnb(":END")
# Get 3rd arg (POBJECT_ATTRIBUTES ObjectAttributes)
shellcode += x86.Mov('EAX', x86.mem('[ESP + 0x1c]')) # 0xc + 0x10 for push
# Get POBJECT_ATTRIBUTES.ObjectName (PUNICODE_STRING)
shellcode += x86.Mov('EAX', x86.mem('[EAX + 0x8]'))
shellcode += x86.Xor('ECX', 'ECX')
# Get PUNICODE_STRING.Length
shellcode += x86.Mov('CX', x86.mem('[EAX + 0]'))
# Get PUNICODE_STRING.Buffer
shellcode += x86.Mov('ESI', x86.mem('[EAX + 4]'))
# Get the next free bytes in shared buffer
shellcode += x86.Mov('EDI', data_kernel_addr + 4)
shellcode += x86.Add('EDI', x86.deref(data_kernel_addr))
# Write (DWORD string_size) in our 'struct'
shellcode += x86.Mov(x86.mem('[EDI]'), 'ECX')
# update size taken in shared buffer
shellcode += x86.Add(x86.deref(data_kernel_addr), 'ECX')
shellcode += x86.Add(x86.deref(data_kernel_addr), 4)
# Write (char[string_size] filename) in our 'struct'
shellcode += x86.Add('EDI', 4)
shellcode += x86.Rep + x86.Movsb()
shellcode += x86.Label(":END")
# Restore buffer
shellcode += x86.Pop('ESI')
shellcode += x86.Pop('EDI')
shellcode += x86.Pop('ECX')
shellcode += x86.Pop('EAX')
# Jump to NtCreateFile
shellcode += x86.JmpAt(nt_create_file + 2)
# Write shellcode
kdbg.write_pfv_memory(shellcode_addr, shellcode.get_code())
long_jump = x86.Jmp(shellcode_addr - (nt_create_file - 5))
# Write longjump to shellcode
kdbg.write_pfv_memory(nt_create_file - 5, long_jump.get_code())
# Write shortjump NtCreateFile -> longjump
short_jmp = x86.Jmp(-5)
kdbg.write_pfv_memory(nt_create_file, short_jmp.get_code())
# Return address of shared buffer in userland
return data_user_addr
GetProcAddress64 += x64.Label(":API_NOT_FOUND")
GetProcAddress64 += x64.Pop("RAX")
GetProcAddress64 += x64.Mov("RAX", 0xffffffffffffffff)
GetProcAddress64 += x64.Jmp(":RETURN")
# Ajout des dependances
GetProcAddress64 += StrlenW64
GetProcAddress64 += StrlenA64
###### 32 bits #######
StrlenW32 = x86.MultipleInstr()
StrlenW32 += x86.Label(":FUNC_STRLENW32")
StrlenW32 += x86.Push("EDI")
StrlenW32 += x86.Mov("EDI", x86.mem("[ESP + 8]"))
StrlenW32 += x86.Push("ECX")
StrlenW32 += x86.Xor("EAX", "EAX")
StrlenW32 += x86.Xor("ECX", "ECX")
StrlenW32 += x86.Dec("ECX")
StrlenW32 += x86.Repne + x86.ScasW()
StrlenW32 += x86.Not("ECX")
StrlenW32 += x86.Dec("ECX")
StrlenW32 += x86.Mov("EAX", "ECX")
StrlenW32 += x86.Pop("ECX")
StrlenW32 += x86.Pop("EDI")
StrlenW32 += x86.Ret()
StrlenA32 = x86.MultipleInstr()
StrlenA32 += x86.Label(":FUNC_STRLENA32")
StrlenA32 += x86.Push("EDI")
StrlenA32 += x86.Mov("EDI", x86.mem("[ESP + 8]"))
StrlenA32 += x86.Push("ECX")