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https://github.com/dobin/SuperMega
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Dobin
72 lines
2.3 KiB
Python
72 lines
2.3 KiB
Python
import pefile
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import logging
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from model.defs import *
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logger = logging.getLogger("PEHelper")
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# PEHelper
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# Work directly on PE files. Not using superpe or other abstractions.
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# Its mostly used for verification of what we were doing.
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def extract_code_from_exe_file_ep(exe_file: FilePath, len: int) -> bytes:
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pe = pefile.PE(exe_file)
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section = get_code_section(pe)
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data: bytes = section.get_data()
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data = remove_trailing_null_bytes(data)
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ep = pe.OPTIONAL_HEADER.AddressOfEntryPoint
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ep_raw = get_physical_address_tmp(pe, ep)
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data = data[ep_raw:ep_raw+len]
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pe.close()
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return data
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def get_physical_address_tmp(pe, virtual_address):
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for section in pe.sections:
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if section.VirtualAddress <= virtual_address < section.VirtualAddress + section.Misc_VirtualSize:
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virtual_offset = virtual_address - section.VirtualAddress
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physical_address = section.PointerToRawData + virtual_offset
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return physical_address
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return None
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def extract_code_from_exe_file(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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data: bytes = section.get_data()
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data = remove_trailing_null_bytes(data)
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logger.debug("---[ Extract code section size: {} / {}".format(
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len(data), section.Misc_VirtualSize))
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pe.close()
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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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pe.close()
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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.Misc_VirtualSize:
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return sect
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raise Exception("pehelper::get_code_section(): Code section not found")
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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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