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injector.py
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injector.py
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import pefile
import mmap
import os
def align(val_to_align, alignment):
return ((val_to_align + alignment - 1) // alignment) * alignment
def patch_bytes(filepath, out_filepath, rva, bytes):
pe = pefile.PE(filepath)
pe.set_bytes_at_rva(rva, bytes)
pe.write(out_filepath)
def inject_data_to_section(filepath, out_filepath, section_name, code):
original_size = os.path.getsize(filepath)
pe = pefile.PE(filepath)
raw_name = section_name + b'\x00' * (8 - len(section_name))
number_of_section = pe.FILE_HEADER.NumberOfSections
file_alignment = pe.OPTIONAL_HEADER.FileAlignment
section_alignment = pe.OPTIONAL_HEADER.SectionAlignment
new_section_offset = (pe.sections[number_of_section - 1].get_file_offset() + 40)
characteristics = 0xE0000020
virtual_offset = pe.sections[-1].VirtualAddress + pe.sections[-1].Misc_VirtualSize
raw_offset = pe.sections[-1].PointerToRawData + pe.sections[-1].SizeOfRawData
virtual_offset = align(virtual_offset, section_alignment)
raw_offset = align(raw_offset, file_alignment)
virtual_size = align(len(code), section_alignment)
raw_size = align(len(code), file_alignment)
pe.set_bytes_at_offset(new_section_offset, raw_name)
pe.set_dword_at_offset(new_section_offset + 8, virtual_size)
pe.set_dword_at_offset(new_section_offset + 12, virtual_offset)
pe.set_dword_at_offset(new_section_offset + 16, raw_size)
pe.set_dword_at_offset(new_section_offset + 20, raw_offset)
pe.set_bytes_at_offset(new_section_offset + 24, (12 * b'\x00'))
pe.set_dword_at_offset(new_section_offset + 36, characteristics)
pe.set_bytes_at_offset(raw_offset, code)
pe.FILE_HEADER.NumberOfSections += 1
pe.OPTIONAL_HEADER.SizeOfImage = virtual_size + virtual_offset
pe.write(out_filepath)
fd = open(out_filepath, 'a+b')
map = mmap.mmap(fd.fileno(), 0, access=mmap.ACCESS_WRITE)
map.resize(original_size + align(len(code), file_alignment))
map.close()
fd.close()
pe = pefile.PE(out_filepath)
raw_offset = pe.sections[-1].PointerToRawData
pe.set_bytes_at_offset(raw_offset, code)
pe.write(out_filepath)
return virtual_offset