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@bontchev

bontchev/unhide.py

Last active Jun 22, 2020
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A script for unhiding hidden Excel sheets
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from __future__ import print_function
import os
import sys
try:
import olefile
except ImportError:
print('Module "olefile" is not installed. Try "pip install olefile".', file=sys.stderr)
sys.exit(-1)
from shutil import copy2
from struct import unpack_from
from argparse import ArgumentParser
__description__ = 'Excel sheet unhider'
__license__ = 'GPL'
__VERSION__ = '1.0.0'
__author__ = 'Vesselin Bontchev'
__email__ = 'vbontchev@yahoo.com'
if sys.version_info[0] >= 3:
def ord(x):
return x
def report(message, verbose):
if verbose:
print(message)
def process_stream(ole_file, stream_path, args):
stream = ole_file.openstream(stream_path).read()
offset = 0
while offset < len(stream):
if offset + 4 >= len(stream):
break
record_id = unpack_from('<H', stream, offset)[0]
record_len = unpack_from('<H', stream, offset + 2)[0]
#report('{:04X}: RecordID: {:04X}, length: {:04X}'.format(offset, record_id, record_len), args.verbose)
offset += 4
if args.verbose and record_id == 0x0809:
# BOF
if offset + 2 >= len(stream):
break
is_biff8 = ord(stream[offset + 1]) == 0x06
elif record_id == 0x0085:
# BOUNDSHEET
if offset + 8 >= len(stream):
break
grbit = ord(stream[offset + 4])
if args.verbose:
if grbit & 0x0003 == 1:
state = ' (hidden)'
elif grbit & 0x0003 == 2:
state = ' (very hidden)'
else:
state = ''
cch = ord(stream[offset + 6])
name_offset = offset + 7 + int(is_biff8)
if name_offset + cch >= len(stream):
break
sheet_name = stream[name_offset:name_offset + cch]
report('\t\tFound BOUNDSHEET record ({}){}.'.format(sheet_name, state), True)
if not args.dryrun and len(state):
report('\t\t\t...unhiding.', True)
if not args.dryrun:
grbit &= ~0x03
replacement = bytes([grbit]) if sys.version_info[0] >= 3 else chr(grbit)
stream = stream[:offset + 4] + replacement + stream[offset + 5:]
offset += record_len
if not args.dryrun:
ole_file.write_stream(stream_path, stream)
def processFile(file_name, args):
report('Processing file: {}...'.format(file_name), args.verbose)
if not olefile.isOleFile(file_name):
report('\tNot an OLE2 file.', args.verbose)
return
if args.backup:
new_name = file_name + '_UNHIDDEN.xls'
report('\tMaking a copy to work on in {}.'.format(new_name), args.verbose)
copy2(file_name, new_name)
file_name = new_name
with olefile.OleFileIO(file_name, write_mode=not args.dryrun) as ole_file:
streams = ole_file.listdir()
for path in streams:
for stream in path:
if stream == 'Book' or stream == 'Workbook':
stream_path = '/'.join(path)
report('\tProcessing stream {}...'.format(stream_path), args.verbose)
process_stream(ole_file, stream_path, args)
def main():
parser = ArgumentParser(description='Dumps the p-code of VBA-containing documents.')
parser.add_argument('-v', '--version', action='version',
version='%(prog)s version {}'.format(__VERSION__))
parser.add_argument('-n', '--norecurse', action='store_true',
help="Don't recurse into directories")
parser.add_argument('-c', '--backup', action='store_true',
help='Save the result to a new file')
parser.add_argument('-b', '--verbose', action='store_true',
help='Verbose information')
parser.add_argument('-d', '--dryrun', action='store_true',
help="Don't actually do anything (use with -b)")
parser.add_argument('fileOrDir', nargs='+', help='File or dir')
args = parser.parse_args()
for name in args.fileOrDir:
if os.path.isdir(name):
for name, subdirList, fileList in os.walk(name):
for fname in fileList:
full_name = os.path.join(name, fname)
processFile(full_name, args)
if args.norecurse:
while len(subdirList) > 0:
del(subdirList[0])
elif os.path.isfile(name):
processFile(name, args)
else:
print('{} does not exist.'.format(name), file=sys.stderr)
if __name__ == '__main__':
main()
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