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oletools 0.05

a package of python tools to analyze MS OLE2 files (also called Structured Storage, Compound File Binary Format or Compound Document File Format), such as Microsoft Office documents

python-oletools is a package of python tools to analyze Microsoft OLE2 files (also called Structured Storage, Compound File Binary Format or Compound Document File Format), such as Microsoft Office documents or Outlook messages, mainly for malware analysis and debugging. It is based on the OleFileIO_PL parser. See http://www.decalage.info/python/oletools for more info.

Note: python-oletools is not related to OLETools published by BeCubed Software.

Tools in python-oletools:

  • olebrowse: A simple GUI to browse OLE files (e.g. MS Word, Excel, Powerpoint documents), to view and extract individual data streams.
  • oleid: a tool to analyze OLE files to detect specific characteristics that could potentially indicate that the file is suspicious or malicious.
  • olemeta: a tool to extract all standard properties (metadata) from OLE files.
  • oletimes: a tool to extract creation and modification timestamps of all streams and storages.
  • pyxswf: a tool to detect, extract and analyze Flash objects (SWF) that may be embedded in files such as MS Office documents (e.g. Word, Excel) and RTF, which is especially useful for malware analysis.
  • rtfobj: a tool and python module to extract embedded objects from RTF files.
  • and a few others (coming soon)

News

  • 2013-07-24 v0.05: added new tools olemeta and oletimes
  • 2013-04-18 v0.04: fixed bug in rtfobj, added documentation for rtfobj
  • 2012-11-09 v0.03: Improved pyxswf to extract Flash objects from RTF
  • 2012-10-29 v0.02: Added oleid
  • 2012-10-09 v0.01: Initial version of olebrowse and pyxswf
  • see changelog in source code for more info.

Download:

The archive is available on the project page.

olebrowse:

A simple GUI to browse OLE files (e.g. MS Word, Excel, Powerpoint documents), to view and extract individual data streams.

Usage: olebrowse.py [file]

If you provide a file it will be opened, else a dialog will allow you to browse folders to open a file. Then if it is a valid OLE file, the list of data streams will be displayed. You can select a stream, and then either view its content in a builtin hexadecimal viewer, or save it to a file for further analysis.

For screenshots and other info, see http://www.decalage.info/python/olebrowse

oleid:

oleid is a script to analyze OLE files such as MS Office documents (e.g. Word, Excel), to detect specific characteristics that could potentially indicate that the file is suspicious or malicious, in terms of security (e.g. malware). For example it can detect VBA macros, embedded Flash objects, fragmentation.

Usage: oleid.py <file>

Example - analyzing a Word document containing a Flash object and VBA macros:

C:\oletools>oleid.py word_flash_vba.doc
Filename: word_flash_vba.doc
OLE format: True
Has SummaryInformation stream: True
Application name: Microsoft Office Word
Encrypted: False
Word Document: True
VBA Macros: True
Excel Workbook: False
PowerPoint Presentation: False
Visio Drawing: False
ObjectPool: True
Flash objects: 1

oleid project website: http://www.decalage.info/python/oleid

pyxswf:

pyxswf is a script to detect, extract and analyze Flash objects (SWF files) that may be embedded in files such as MS Office documents (e.g. Word, Excel), which is especially useful for malware analysis.

pyxswf is an extension to xxxswf.py published by Alexander Hanel.

Compared to xxxswf, it can extract streams from MS Office documents by parsing their OLE structure properly, which is necessary when streams are fragmented. Stream fragmentation is a known obfuscation technique, as explained on http://www.breakingpointsystems.com/resources/blog/evasion-with-ole2-fragmentation/

It can also extract Flash objects from RTF documents, by parsing embedded objects encoded in hexadecimal format (-f option).

For this, simply add the -o option to work on OLE streams rather than raw files, or the -f option to work on RTF files.

Usage: pyxswf.py [options] <file.bad>

Options:
  -o, --ole             Parse an OLE file (e.g. Word, Excel) to look for SWF
                        in each stream
  -f, --rtf             Parse an RTF file to look for SWF in each embedded
                        object
  -x, --extract         Extracts the embedded SWF(s), names it MD5HASH.swf &
                        saves it in the working dir. No addition args needed
  -h, --help            show this help message and exit
  -y, --yara            Scans the SWF(s) with yara. If the SWF(s) is
                        compressed it will be deflated. No addition args
                        needed
  -s, --md5scan         Scans the SWF(s) for MD5 signatures. Please see func
                        checkMD5 to define hashes. No addition args needed
  -H, --header          Displays the SWFs file header. No addition args needed
  -d, --decompress      Deflates compressed SWFS(s)
  -r PATH, --recdir=PATH
                        Will recursively scan a directory for files that
                        contain SWFs. Must provide path in quotes
  -c, --compress        Compresses the SWF using Zlib

Example 1 - detecting and extracting a SWF file from a Word document on Windows:

C:\oletools>pyxswf.py -o word_flash.doc
OLE stream: 'Contents'
[SUMMARY] 1 SWF(s) in MD5:993664cc86f60d52d671b6610813cfd1:Contents
        [ADDR] SWF 1 at 0x8  - FWS Header

C:\oletools>pyxswf.py -xo word_flash.doc
OLE stream: 'Contents'
[SUMMARY] 1 SWF(s) in MD5:993664cc86f60d52d671b6610813cfd1:Contents
        [ADDR] SWF 1 at 0x8  - FWS Header
                [FILE] Carved SWF MD5: 2498e9c0701dc0e461ab4358f9102bc5.swf

Example 2 - detecting and extracting a SWF file from a RTF document on Windows:

C:\oletools>pyxswf.py -xf "rtf_flash.rtf"
RTF embedded object size 1498557 at index 000036DD
[SUMMARY] 1 SWF(s) in MD5:46a110548007e04f4043785ac4184558:RTF_embedded_object_0
00036DD
        [ADDR] SWF 1 at 0xc40  - FWS Header
                [FILE] Carved SWF MD5: 2498e9c0701dc0e461ab4358f9102bc5.swf

For more info, see http://www.decalage.info/python/pyxswf

rtfobj

rtfobj is a Python module to extract embedded objects from RTF files, such as OLE ojects. It can be used as a Python library or a command-line tool.

Usage: rtfobj.py <file.rtf>

It extracts and decodes all the data blocks encoded as hexadecimal in the RTF document, and saves them as files named "object_xxxx.bin", xxxx being the location of the object in the RTF file.

Usage as python module: rtf_iter_objects(filename) is an iterator which yields a tuple (index, object) providing the index of each hexadecimal stream in the RTF file, and the corresponding decoded object. Example:

import rtfobj
for index, data in rtfobj.rtf_iter_objects("myfile.rtf"):
    print 'found object size %d at index %08X' % (len(data), index)

For more info, see http://www.decalage.info/python/rtfobj

How to contribute:

The code is available in a Mercurial repository on bitbucket. You may use it to submit enhancements or to report any issue.

If you would like to help us improve this module, or simply provide feedback, you may also send an e-mail to decalage(at)laposte.net.

How to report bugs:

To report a bug or any issue, please use the issue reporting page, or send an e-mail with all the information and files to reproduce the problem.

License

This license applies to the python-oletools package, apart from the thirdparty folder which contains third-party files published with their own license.

The python-oletools package is copyright (c) 2012-2013, Philippe Lagadec (http://www.decalage.info) All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  • Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
  • Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 
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