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pyxswf - a python tool to extract SWF (Flash) objects from documents (improved xxxswf)
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) and RTF, which is especially useful for malware analysis. It is part of the oletools package. pyxswf is an extension of xxxswf.py published by Alexander Hanel.
See the oletools page for more info.
pyxswf and xxxswf
pyxswf is an extension of 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.
News
- 2012-11-09 v0.02: Improved pyxswf to extract Flash objects from RTF (-f option)
- 2012-10-09: Initial version of olebrowse and pyxswf
- see changelog in source code for more info.
Download:
The archive is available on the project page.
Usage
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
Examples
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
See also the article How to Extract Flash Objects From Malicious MS Office Documents, which shows how to use xxxswf.py in practice. You may simply use "pyxswf.py -o" instead of xxxswf.py.
