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机器码分析和修改的基本技术原理。第一个文件提供了反汇编和汇编功能,第二个文件演示了代码混淆技术。请注意,实际应用中需要考虑更多因素如平台兼容性、异常处理等。
import sys
import binascii
import struct
from capstone import
from keystone import
class MachineCodeAnalyzer:
def init(self, arch=CS_ARCH_X86, mode=CS_MODE_32):
self.md = Cs(arch, mode)
self.ks = Ks(KS_ARCH_X86, KS_MODE_32)
def disassemble(self, code, offset=0):
for instr in self.md.disasm(code, offset):
print(f"0x{instr.address:x}:\t{instr.mnemonic}\t{instr.op_str}")
def assemble(self, asm_code):
encoding, count = self.ks.asm(asm_code)
return bytes(encoding)
def modify_code(self, original_code, patch_offset, new_asm):
new_bytes = self.assemble(new_asm)
modified = bytearray(original_code)
modified[patch_offset:patch_offset+len(new_bytes)] = new_bytes
return bytes(modified)
def find_pattern(self, code, pattern):
return code.find(pattern)
random
import zlib
import base64
from cryptography.fernet import Fernet
class CodeObfuscator:
def init(self):
self.key = Fernet.generate_key()
self.cipher = Fernet(self.key)
def encrypt_code(self, code):
compressed = zlib.compress(code)
encrypted = self.cipher.encrypt(compressed)
return base64.b64encode(encrypted)
def decrypt_code(self, encrypted_code):
decoded = base64.b64decode(encrypted_code)
decrypted = self.cipher.decrypt(decoded)
return zlib.decompress(decrypted)
def insert_junk_code(self, asm_code, junk_count=5):
junk_instructions = [
"nop",
"xchg eax, eax",
"push eax\npop eax",
"mov eax, eax",
"add eax, 0"
]
lines = asm_code.split('\n')
for _ in range(junk_count):
pos = random.randint(0, len(lines))
junk = random.choice(junk_instructions)
lines.insert(pos, junk)
return '\n'.join(lines)