EnCase and Python – Part 2

James Habben

In Part 1 of this post, I shared a method that lets you use Python scripts by configuring a file viewer in EnCase. We used Didier Stevens’ pdf-parser as an example. I also showed how EnScript could be used to greater effect by allowing us to capture the output of pdf-parser directly in a bookmark without having to manually copy and paste. Both of these techniques reduce effort by leveraging capabilities of both EnCase and the Python language.

In this post, I’ll take the same principles and apply them into an EnScript that provides a little more flexibility and functionality. Our goal is to have a GUI that gives you control over the exact functionality you want from the pdf-parser tool.

EnCase and Python - Part 1

James Habben

As a co-author and instructor for Guidance Software’s EnScript Programming course, I spend a lot of time teaching investigators in person around the globe. Investigators are faced with a dizzying variety of challenges. We work together in class, coming up with solutions that send EnCase off to do our bidding. EnCase and EnScript allow us to “bottle” the result of our efforts to share with other investigators (e.g. categorizing internet history, detecting files hidden by rootkits).

Python is used similarly. The interweb hosts great tools written in Python to accomplish all measures of tasks facing DFIR examiners. The community benefits from the hours of work that go into each and every .py that gets baked. It seemed to me that there should be a way for EnCase and Python to work together, so I put together a brief tutorial.

Fear and Loathing in Internet History

James Habben

As a DFIR examiner, poring over internet history records is a well-loathed daily activity. We spend hours looking at these lists trying to find an interesting URL that moves our case one direction or another. Sometimes we can use a filtering mechanism to remove URLs that we know for certain are uninteresting, but keeping a list like this up to date is a manual task. I used Websense to assist with this type of work at my previous job, but I have also had brief experiences with Blue Coat. as well.

POSIX Regular Expressions in EnScript and .NET

James Habben

I am sure you have spent a little intimate time with EnCase doing keyword searches, so you know that EnCase has basic GREP capabilities. This is a powerful feature that allows for searches to be performed with patterns that can eliminate false positive hits. Recently, we hosted a webinar with guest Suzanne Widup, describing some techniques and benefits of using GREP in EnCase.

GREP is a term that comes from the Unix world long ago. It stands for Globally search for Regular Expressions and Print. This command line utility was used to search through data and print out results that matched the given pattern. Because of the popularity of the tool, the name has become synonymous with Regular Expressions (Regex). Though there is a defined standard, POSIX, the syntax of patterns used in Regex actually varies quite wildly depending on the platform engine and programming language that is being used. EnCase is no exception. In homage to our habit of prefixing our product names with “En”, I jokingly refer to our syntax of regex as “EnGrep.”

Feature Spotlight: Report Template Wizard

Ken Mizota

No forensic investigation is complete without a comprehensive report tailored to the intended audience. Whether the cases involve crime, civil litigation, or policy non-compliance, the end goal of an investigation is to share findings with others. EnCase Version 7 provides powerful tools to efficiently incorporate the findings of the investigation into a Report Template. While powerful, Report Templates can have a steep learning curve, and particularly in time-sensitive investigations, simplicity may be more desirable than power.

EnCase Version 7.10 adds the Report Template Wizard. You can quickly add a Bookmark Folder to the Report Template, specify metadata, perform basic formatting, and preview the report. The Report Template Wizard simplifies reporting while maintaining the power of Report Templates. Read on beyond the jump to learn more.