ZENA FORENSICS

Few weeks ago I was contacted about how to decrypt Windows Dropbox DBX files and the same topic appeared on SANS DFIR mailing list too. So I decided to create an Open Source toolkit and this post to brush up on the DBX files create by the Dropbox client on a Windows machine. The Windows Dropbox client keeps its own files - user info, configuration, ' my dropbox ' files sync status and even more - inside the user profile: on the Windows 7 and Windows 10 machines I used for test they reside in ' \Users\%USERNAME%\AppData\Local\Dropbox\ ' and sub folders. Among them there are files with .DBX extension, which are the target of this post. When you take a raw  look at them, you see garbage, noise ... encryption  is in place. Without too much suspence , this is well-known. Nicolas Ruff and Florian Ledoux had a talk at hack.lu   2012 on the topic, “ A critical analysis of Dropbox software security ” ( here ). They discovered that the encryption key used for DBX fi...

Windows Vaults  and Credentials  allow the user to store sensitive information such as user names and passwords , that can be later used to log on web site, services and computers. In this post it will be shown how such data is protected and how you can decrypt it offline. This post is a very late debriefing of the talk I had at  SANS DFIR Summit Prague 2015  and it's the first of two posts. You can download the slides from  SANS Summit Archives  or from  SlideShare . introduction I've never used Vault/Credential facility on purpose, even if the system used it without my knowledge : it's worthwhile to know that Windows autonomously uses it almost every day. In any case, we can find sensitive information there, and this is the reason I started this research, as to have a little more strings to my ODI  ( Offensive Digital Investigations ) bow. Windows provides two utilities to manage such credentials, the graphical  Credential Mana...