Geoff Black's Forensic Gremlins

Corey Harrell has just proved the old adage that sometimes simple solutions are the best (and I mean that in a very good way). On his blog, Journey into IR, you’ll find a link to a custom Google Search for the Digital Forensics Search. Google’s Custom Search functionality allows you to create a link to a Google page that only searches specific sites, much like using the “site:” keyword in a search, except specifying numerous sites, generally on a similar topic. What a fantastic idea! This should be a great place to find valuable information that is specific to digital forensics as opposed to weeding through the sometimes useless hits on a broader Google search. I have also posted a Google widget on my sidebar that goes directly to the search page as a constant reminder (I tend to forget things like this after about five minutes). Thanks Corey!

A few weeks ago I had a unique opportunity to attend the Corporate E-Discovery Forum’s (CEDF) New York Forum. The CEDF is a non-profit organization that hosts and guides gatherings for its members, consisting of over 200 corporations and 400 individual participants, to encourage collaboration on E-Discovery issues. The forums give members the opportunity to discuss document retention policies and enterprise content management practices, litigation holds, preservation, collection, processing of electronically-stored information, cost and risk management, best practices to avoid spoliation and sanctions, and understanding plaintiffs’ strategies. Although vendors participate in the forums, they contribute equally with other members based on their experience (no sales pitches allowed).

Although there was a large turnout, I was pleasantly surprised at the level of interaction achieved in the sessions. Board members Nicholas Bunin, Jeri Head, and Patrick Gibson did a great job introducing sessions and spurring conversation. The board places great emphasis on active communication as opposed to having a single presenter talking at the crowd.

This recent forum was all about social media – Facebook, LinkedIn, Twitter – in corporate environments. Social media has obviously been around for quite some time, but in the corporate environment, policy makers are just getting comfortable with its use for business purposes. As a user, my first instinct is to question why this causes a problem; as a corporate investigator, I can tell you that social media can cause significant problems in the workplace and creates a whole new medium in which violations can occur. There are myriad new legal guidelines emerging around how corporations should regulate these tools in light of the current legal landscape. Regulatory agencies have also recently had their say on the diligent monitoring that must occur in the financial industry in relation to social media.

The forum had four main sessions during the day: Social Media and Reducing Risk, Practical Guide for Corporations to the Identification, Collection and Production of Social Media, Social Media Policy, and Social Media Dialog with Judges. While the guidelines of the organization prohibit sharing of content outside of the forum, I’ll just say that the day was well spent and I learned quite a bit. The next forum theme will be Cloud Technology, and will take place at the San Francisco Forum in June. The Corporate E-Discovery Forum would love to have new members participate and contribute to the discussions, and welcomes technical practitioners as well. If you’re a member of a corporate E-Discovery team, whether legal or tech, I’d highly encourage you join and participate!

Takahiro Haruyama, who is well known for bringing the power of Volatility to EnScript land, made a great revision to my Timeline EnScript by adding MFT FileName Attribute parsing to it! He’s published the update on his blog. This really makes the script much more versatile and I think forensics practitioners will love the update. Right now the script only outputs the info to the HTML view, but over the next few weeks I’ll try to find some time to push it into all the output formats and give everyone an update. Great work Haruyama, thanks for adding this much needed functionality!

NYC4SEC held a great Meetup on Wednesday to discuss image analysis and photo forensics… “Thanksgiving Meet-up: Let’s carve some data!” Professor Nasir Memon from NYU Poly came to give us some expert insight into the latest techniques in photo forensics. Before I give an overview of his talk, let me just say that NYC4SEC has been the best thing to happen to the NYC forensics community in the 4.5 years I’ve been here in the city. I’ve met a lot of great people working in our field through this Meetup group, some that I knew via email and message boards beforehand and some new. It’s also nice to see the students from John Jay’s computer forensics program coming to the Meetup to learn and meet industry experts.

Dr. Memon is a brilliant guy; in the past he served on the JPEG standard design committee which you can imagine leads to some very relevant experience for photo forensics. He gave us an overview of how SmartCarving works in Adroit Photo Forensics, a tool he helped design (which is awesome!). This wasn’t a sales pitch, though. He explained how the photo fragments are located and reassembled. This was interesting, but not as interesting as the work he’s done matching digital photos to their source. Memon went through all the various artifacts that digital photo capture devices leave behind. Every digital camera has physical imperfections in its hardware that leave a trail. Ballistics experts match a bullet to a gun by firing new bullets and comparing them to those left at crime scenes. In much the same way, photo experts can link a digital photo to a camera by taking new photos with that camera and comparing the noise patterns. There are two things that could be useful with this technique. (1) Creating a catalog of patterns from different types of cameras – the problem here is that sometimes different manufacturers use the same parts in their cameras. (2) Seizing a digital camera at a crime scene and being able to prove, definitively, that it took the pictures in question. It’s more than just a match to a Make and Model – it’s like DNA for cameras! The final item that Dr. Memon discussed was the ability to detect image manipulation in an automated fashion. This plays off the same basic theory of matching a camera to a photo. Basically he can detect if a portion of a photo has different noise patterns and then discern that pieces of the photo are not original, but doctored or added.

The NYC4SEC Meetups just keep getting better! We had a great turnout and I hope to see more industry professionals at the next one!