Here is a list of all articles and presentations I have published about Cyber Security so far.
This is a series of articles about file formats and related security issues. In 2003 I had presented an article in French about this subject at the SSTIC conference: [SSTIC03]. In the following articles I will provide an updated version in English with more information about common file formats.
This custom Google search engine helps you find malware samples containing specific strings, filenames, hashes or other IOCs. It uses the data indexed by several websites including malwr.com, hybrid-analysis.com, virustotal.com and virusshare.com.
For example, search "VB_Nam" to find malicious VBA macros, or "\objdata" to find RTF files with OLE Package objects.
mraptor is a simple tool designed to detect malicious VBA macros in MS Office files, based on characteristics of the VBA code. This article explains how it works, and how it can be used in practice.
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, forensics and debugging. It is based on my olefile parser.
This article describes several anti-analysis tricks found in recent malicious RTF documents, and how I improved rtfobj to handle them.
A few days ago, @Bry_Campbell told me about a strange sample with a malicious macro, that could not be fully analyzed with online sandboxes and the usual tools.
Since 2014, malicious macros are coming back. And their success in recent campaigns demonstrates that it is still an effective way to deliver malware, sixteen years after Melissa.
This is a presentation that I gave to the SSTIC symposium in June 2015, translated to English. It explains what malicious macros can do, how their code can be obfuscated, and some of the anti-analysis tricks observed in recent cases. Then it shows several tools that can be used to analyze macros, including oledump and olevba.
It is sometimes useful to look for malware samples containing a specific string. For example, you might look for samples sharing similar code to analyze a malware campaign with different targets. Another use case is discovering the original version of a modified file, as described in my article "Unmasking Malfunctioning Malicious Documents".
From time to time, people report strange malicious documents which are not successfully analyzed by malware analysis tools nor by sandboxes. Let's investigate. (this is a follow-up to the post "Malfunctioning Malware" by Didier Stevens)