Balbuzard

Balbuzard is a package of malware analysis tools in python to extract patterns of interest from suspicious files (IP addresses, domain names, known file headers, interesting strings, etc). It can also crack malware obfuscation such as XOR, ROL, etc by bruteforcing and checking for those patterns.

Quick links: Download - Install - Documentation - Contact - Report issues - Updates on Twitter

Balbuzard tools:

balbuzard is a tool to extract patterns of interest from malicious files, such as IP addresses, URLs, embedded files and typical malware strings. It is easily extensible with new patterns, regular expressions and Yara rules.
bbcrack uses a new algorithm based on patterns of interest to bruteforce typical malware obfuscation such as XOR, ROL, ADD and various combinations, in order to guess which algorithms/keys have been used.
bbharvest extracts all patterns of interest found when applying typical malware obfuscation transforms such as XOR, ROL, ADD and various combinations, trying all possible keys. It is especially useful when several keys or several transforms are used in a single file.
bbtrans can apply any of the transforms from bbcrack (XOR, ROL, ADD and various combinations) to a file.

When to use these tools:

If you need to analyze a new malicious file, you can first try balbuzard to extract strings/patterns of interest and detect embedded files in cleartext.
Then if you think the malicious file might use an obfuscation algorithm such as XOR to hide interesting data (e.g. an embedded executable file), try bbcrack to find the algorithm and the key(s).
Alternatively, if bbcrack is not successful, or if you think the file may use several algorithms and/or keys, try bbharvest. bbharvest is especially targeted at single strings obfuscated within an executable or malicious file.

5 minutes demo

See the Demo page to see examples and test the tools by yourself in a few minutes using the provided samples.

Help wanted:

if you have malware samples or malicious documents with known obfuscation algorithms such as XOR, please contact me. That will help me a lot to improve bbcrack and bbharvest.
if you know other strings, patterns, file headers useful for malware analysis that Balbuzard should support, or other obfuscation algorithms, please contact me.

See http://www.decalage.info/python/balbuzard for more info and other tools.

News

Follow all updates and news on Twitter: https://twitter.com/decalage2

2014-03-23 v0.19: bugfix when Yara is not installed, improved documentation.
2014-02-26 v0.18: Initial release of Balbuzard tools
2013-03-15: added harvest mode (bbharvest)
2011-05-06: added bruteforce functions (bbcrack)
2008-06-06: first public release as reScan for SSTIC08
2007-07-11: first versions of reScan
see changelog in source code for more info.

Download

The archive is available on the project page on Bitbucket.

Installation

See the installation instructions.

How to contribute / report bugs / ask for help:

These are open-source tools developed on my spare time. Any contribution such as code improvements, ideas, bug reports, additional patterns or transforms would be highly appreciated. You may contact me using this online form, by e-mail (decalage at laposte.net) or use the issue page on Bitbucket to report bugs/ideas, or clone the project then send me pull requests to suggest changes.

License

This license applies to the whole Balbuzard package including balbuzard, bbcrack, bbharvest and bbtrans, apart from the thirdparty and plugins folders which contain third-party files published with their own license.

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.