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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/pehelper.py
-55
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@@ -1,8 +1,4 @@
import sys
import pefile
import pprint
from keystone import Ks, KS_ARCH_X86, KS_MODE_64
from capstone import Cs, CS_ARCH_X86, CS_MODE_64, CS_MODE_LITTLE_ENDIAN
import logging
from model.defs import *
@@ -66,57 +62,6 @@ def get_code_section(pe: pefile.PE) -> pefile.SectionStructure:
raise Exception("pehelper::get_code_section(): Code section not found")
# keystone/capstone stuff
cs = Cs(CS_ARCH_X86, CS_MODE_64 + CS_MODE_LITTLE_ENDIAN)
def assemble_lea(current_address: int, destination_address: int, reg: str) -> bytes:
#print("LEAH: 0x{:X} - 0x{:X} = 0x{:X}".format(
# current_address, destination_address, destination_address - current_address))
offset = destination_address - current_address
ks = Ks(KS_ARCH_X86, KS_MODE_64)
encoding, _ = ks.asm(f"lea {reg}, qword ptr ds:[{offset}]")
machine_code = bytes(encoding)
return machine_code
def assemble_relative_call(current_address: int, destination_address: int) -> bytes:
# Calculate the relative offset
# For a near jump, the instruction length is typically 5 bytes (E9 xx xx xx xx)
offset = destination_address - current_address
# Assemble the jump instruction using Keystone
ks = Ks(KS_ARCH_X86, KS_MODE_64)
encoding, _ = ks.asm(f"call qword ptr ds:[{offset}]")
machine_code = bytes(encoding)
# Disassemble the machine code using Capstone
#cs = Cs(CS_ARCH_X86, CS_MODE_64)
#disassembled = next(cs.disasm(machine_code, current_address))
#logger.info(f"Machine Code: {' '.join(f'{byte:02x}' for byte in machine_code)}")
#logger.info(f"Disassembled: {disassembled.mnemonic} {disassembled.op_str}")
return machine_code
def assemble_relative_jmp(current_address: int, destination_address: int) -> bytes:
offset = destination_address - current_address
ks = Ks(KS_ARCH_X86, KS_MODE_64)
encoding, _ = ks.asm(f"jmp {offset}")
machine_code = bytes(encoding)
return machine_code
def asm_disasm(asm_text, offset=0):
for instr in cs.disasm(asm_text, offset):
printInstr(instr)
def printInstr(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}')
## Utils
def remove_trailing_null_bytes(data: bytes) -> bytes: