mirror of
https://github.com/dobin/SuperMega
synced 2026-06-03 01:27:11 +00:00
Dobin
131 lines
4.4 KiB
Python
131 lines
4.4 KiB
Python
from typing import Dict, List
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import logging
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import pefile
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from model.defs import *
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import peparser.pehelper as pehelper
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from peparser.superpe import SuperPe
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from peparser.misc import get_physical_address
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logger = logging.getLogger("ExeHost")
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class RelocEntry():
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def __init__(self, rva: int, base_rva: int, type: str):
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self.rva: int = rva
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self.base_rva: int = base_rva
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self.type: str = type
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class IatEntry():
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def __init__(self, dll_name: str, func_name: str, iat_vaddr: int):
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self.dll_name: str = dll_name
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self.func_name: str = func_name
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self.iat_vaddr: int = iat_vaddr
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class ExeHost():
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def __init__(self, filepath: FilePath):
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self.filepath: FilePath = filepath
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# we keep this open
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# And modify the EXE through this at the end
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self.pe: pefile.PE = None
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self.superpe: SuperPe = None
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self.iat: Dict[str, IatEntry] = {}
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self.base_relocs = []
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self.image_base: int = 0
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self.dynamic_base: bool = False
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self.code_virtaddr: int = 0
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self.code_size: int = 0
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self.code_section = None
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self.rwx_section = None
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self.ep = None
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self.ep_raw = None
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def init(self):
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logger.info("--[ Analyzing: {}".format(self.filepath))
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pe = pefile.PE(self.filepath)
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self.pe = pe
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self.superpe = SuperPe(pe)
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self.superpe.init()
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if pe.FILE_HEADER.Machine != 0x8664:
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raise Exception("Binary is not 64bit: {}".format(self.filepath))
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self.ep = pe.OPTIONAL_HEADER.AddressOfEntryPoint
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self.ep_raw = get_physical_address(pe, self.ep)
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# image base
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self.image_base = pe.OPTIONAL_HEADER.ImageBase
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# dynamic base / ASLR
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if pe.OPTIONAL_HEADER.DllCharacteristics & pefile.DLL_CHARACTERISTICS['IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE']:
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self.dynamic_base = True
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else:
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self.dynamic_base = False
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# .text virtual address
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self.code_section = pehelper.get_code_section(pe)
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self.code_virtaddr = self.code_section.VirtualAddress
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self.code_size = self.code_section.Misc_VirtualSize
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logger.info("---[ Injectable: Chosen code section: {} at 0x{:x} size: {}".format(
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self.code_section.Name.decode().rstrip('\x00'),
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self.code_virtaddr,
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self.code_size))
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# relocs
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if hasattr(pe, 'DIRECTORY_ENTRY_BASERELOC'):
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for base_reloc in pe.DIRECTORY_ENTRY_BASERELOC:
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for entry in base_reloc.entries:
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rva = entry.rva
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base_rva = entry.base_rva
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reloc_type = pefile.RELOCATION_TYPE[entry.type][0]
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self.base_relocs.append({
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'rva': rva,
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'base_rva': base_rva,
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'type': reloc_type,
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})
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# rwx section
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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.Misc_VirtualSize:
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self.rwx_section = section
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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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# IAT
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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 self.iat:
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self.iat[dll_name] = []
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self.iat[dll_name].append(IatEntry(dll_name, imp_name, imp_addr))
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def get_vaddr_of_iatentry(self, func_name: str) -> int:
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for dll_name in self.iat:
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for entry in self.iat[dll_name]:
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if entry.func_name == func_name:
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return entry.iat_vaddr
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return None
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