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refactor: move capstone/keystone into its own file

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Dobin
2024-05-10 12:02:24 +01:00
parent 900c145557
commit 696599cb64
4 changed files with 70 additions and 80 deletions
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pe/derbackdoorer.py
+7 -25
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@@ -13,7 +13,7 @@ from intervaltree import *
from utils import hexdump
from pe.superpe import SuperPe
from model.defs import *
from pe.pehelper import assemble_relative_call, assemble_relative_jmp
from pe.asmdisasm import assemble_relative_jmp, asm_disasm, cs, ks, printInstr
logger = logging.getLogger("DerBackdoorer")
@@ -28,10 +28,6 @@ class FunctionBackdoorer:
def __init__(self, superpe: SuperPe, depth_option=DEPTH_OPTIONS.LEVEL1):
self.superpe: SuperPe = superpe
self.pe_data = self.superpe.pe.get_memory_mapped_image()
self.cs = capstone.Cs(capstone.CS_ARCH_X86, capstone.CS_MODE_64 + capstone.CS_MODE_LITTLE_ENDIAN)
self.ks = keystone.Ks(keystone.KS_ARCH_X86, keystone.KS_MODE_64 + keystone.KS_MODE_LITTLE_ENDIAN)
self.cs.detail = True
self.depth_option: DEPTH_OPTIONS = depth_option
@@ -60,12 +56,7 @@ class FunctionBackdoorer:
# Show Result
logger.info("--[ Patched result of function: ".format())
data = self.pe_data[function_addr:addr+len(compiled_trampoline)]
self.asm_disasm(data, offset=function_addr)
def asm_disasm(self, asm_text, offset=0):
for instr in self.cs.disasm(asm_text, offset):
self.printInstr(instr, 0)
asm_disasm(data, offset=function_addr)
def find_suitable_instruction_addr(self, startOffset, length=256):
@@ -90,8 +81,8 @@ class FunctionBackdoorer:
def _find_suitable_instruction_addr(self, startOffset, length, option):
# iterate through every instruction. starting from startOffset
data = self.pe_data[startOffset:startOffset + length]
for instr in self.cs.disasm(data, startOffset):
self.printInstr(instr, 0)
for instr in cs.disasm(data, startOffset):
printInstr(instr, 0)
if instr.mnemonic.lower() in ['ret']:
return None
@@ -124,7 +115,7 @@ class FunctionBackdoorer:
full_shellcode_addr = shellcode_addr + self.superpe.pe.OPTIONAL_HEADER.ImageBase
enc, count = self.ks.asm(f'MOV {reg}, 0x{full_shellcode_addr:X}')
for instr2 in self.cs.disasm(bytes(enc), 0):
for instr2 in cs.disasm(bytes(enc), 0):
addrOffset = len(instr2.bytes) - instr2.addr_size
break
@@ -141,16 +132,7 @@ class FunctionBackdoorer:
])
trampoline_text = f'MOV {reg}, 0x{full_shellcode_addr:X} ; {jump}'
trampoline_compiled, count = self.ks.asm(trampoline_text)
trampoline_compiled, count = ks.asm(trampoline_text)
return trampoline_compiled, trampoline_text, addrOffset
def printInstr(self, instr, depth=0):
_bytes = [f'{x:02x}' for x in instr.bytes[:8]]
if len(instr.bytes) < 8:
_bytes.extend([' ',] * (8 - len(instr.bytes)))
instrBytes = ' '.join([f'{x}' for x in _bytes])
logger.info('\t' * 1 + f'[{instr.address:08x}]\t{instrBytes}' + '\t' * depth + f'{instr.mnemonic}\t{instr.op_str}')