mirror of
https://github.com/dobin/SuperMega
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Dobin
123 lines
4.1 KiB
Python
123 lines
4.1 KiB
Python
import sys
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import pefile
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import pprint
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from keystone import Ks, KS_ARCH_X86, KS_MODE_64
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from capstone import Cs, CS_ARCH_X86, CS_MODE_64
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import logging
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from defs import *
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logger = logging.getLogger("PEHelper")
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def extract_code_from_exe(exe_file: FilePath) -> bytes:
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pe = pefile.PE(exe_file)
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section = get_code_section(pe)
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logger.info("--[ Code section: {}".format(section.Name.decode().rstrip('\x00')))
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data: bytes = section.get_data()
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data = remove_trailing_null_bytes(data)
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logger.info(" > 0x{:X} Code Size: {} (raw code section size: {})".format(
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section.VirtualAddress,
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len(data), section.SizeOfRawData))
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return data
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def write_code_section(exe_file: FilePath, new_data: bytes):
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pe = pefile.PE(exe_file)
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section = get_code_section(pe)
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file_offset = section.PointerToRawData
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with open(exe_file, 'r+b') as f:
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f.seek(file_offset)
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f.write(new_data)
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def get_code_section(pe: pefile.PE) -> pefile.SectionStructure:
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entrypoint = pe.OPTIONAL_HEADER.AddressOfEntryPoint
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for sect in pe.sections:
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if sect.Characteristics & pefile.SECTION_CHARACTERISTICS['IMAGE_SCN_MEM_EXECUTE']:
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if entrypoint >= sect.VirtualAddress and entrypoint <= sect.VirtualAddress + sect.SizeOfRawData:
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return sect
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raise Exception("Code section not found")
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# RWX
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def get_rwx_section(pe: pefile.PE) -> pefile.SectionStructure:
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entrypoint = pe.OPTIONAL_HEADER.AddressOfEntryPoint
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for section in pe.sections:
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if (section.Characteristics & pefile.SECTION_CHARACTERISTICS['IMAGE_SCN_MEM_READ'] and
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section.Characteristics & pefile.SECTION_CHARACTERISTICS['IMAGE_SCN_MEM_WRITE'] and
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section.Characteristics & pefile.SECTION_CHARACTERISTICS['IMAGE_SCN_MEM_EXECUTE']
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):
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if entrypoint > section.VirtualAddress and entrypoint < section.VirtualAddress + section.SizeOfRawData:
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return section
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return None
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# keystone/capstone stuff
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def assemble_and_disassemble_jump(current_address: int, destination_address: int) -> bytes:
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#logger.info(" Make jmp from 0x{:X} to 0x{:X}".format(
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# current_address, destination_address
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#))
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# Calculate the relative offset
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# For a near jump, the instruction length is typically 5 bytes (E9 xx xx xx xx)
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offset = destination_address - current_address
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# Assemble the jump instruction using Keystone
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ks = Ks(KS_ARCH_X86, KS_MODE_64)
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encoding, _ = ks.asm(f"call qword ptr ds:[{offset}]")
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machine_code = bytes(encoding)
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# Disassemble the machine code using Capstone
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#cs = Cs(CS_ARCH_X86, CS_MODE_64)
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#disassembled = next(cs.disasm(machine_code, current_address))
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#logger.info(f"Machine Code: {' '.join(f'{byte:02x}' for byte in machine_code)}")
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#logger.info(f"Disassembled: {disassembled.mnemonic} {disassembled.op_str}")
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return machine_code
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# IAT Stuff
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def extract_iat(pe: pefile.PE):
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iat = {}
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# If the PE file was loaded using the fast_load=True argument, we will need to parse the data directories:
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#pe.parse_data_directories()
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# Retrieve the IAT entries from the PE file
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for entry in pe.DIRECTORY_ENTRY_IMPORT:
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for imp in entry.imports:
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dll_name = entry.dll.decode('utf-8')
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if imp.name == None:
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continue
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imp_name = imp.name.decode('utf-8')
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imp_addr = imp.address
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if not dll_name in iat:
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iat[dll_name] = []
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iat[dll_name].append({
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"dll_name": dll_name,
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"func_name": imp_name,
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"func_addr": imp_addr
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})
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return iat
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def get_addr_for(iat, func_name: str) -> int:
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for dll_name in iat:
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for entry in iat[dll_name]:
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if entry["func_name"] == func_name:
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return entry["func_addr"]
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return 0
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## Utils
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def remove_trailing_null_bytes(data: bytes) -> bytes:
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for i in range(len(data) - 1, -1, -1):
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if data[i] != b'\x00'[0]: # Check for a non-null byte
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return data[:i + 1]
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return b'' # If the entire sequence is null bytes
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