Two developers have created “Detect and Eliminate Computer Assisted Forensics” (DECAF). The tool tries to stop Microsoft’s Computer Online Forensic Evidence Extractor (COFEE), which helps law enforcement officials grab data from password-protected or encrypted sources.
In response to Microsoft’s Computer Online Forensic Evidence Extractor (COFEE), which helps law enforcement officials grab data from password-protected or encrypted sources, two developers have created “Detect and Eliminate Computer Assisted Forensics” (DECAF), a counter intelligence tool designed to thwart the Microsoft forensic toolkit. DECAF monitors the computer it’s running on for any signs that COFEE is operating on the machine and does everything it can to stop it.
More specifically, the program deletes COFEE’s temporary files, kills its processes, erases all COFEE logs, disables USB drives, and even contaminates or spoofs a variety of MAC addresses to muddy forensic tracks. It can be told to disable almost every piece of hardware on a machine and delete pre-defined files in the background. The 181KB DECAF program even has a ‘Spill the cofee’ mode in which it simulates COFEE’s presence to give the user an opportunity to test his or her configuration before actually using it. Source code for DECAF has not been made available, since the authors fear it will be reverse engineered, making it unclear what else the tool might be doing and whether or not it is completely safe to use.
DECAF’s developers say future versions of the program will allow computer owners to remotely lock down their machine via text message and e-mail once they detect that it has fallen into law enforcement hands and even send out notifications to other parties in the case of an emergency. The plan is to make DECAF’s next release more light-weight, possibly having it run in the form of a Windows service.