Computer forensics training in Prague

In this Help Net Security interview, Gareth Dance, Conference Director, EMEA, SANS Institute, talks about SANS Forensics Prague 2012.

SANS Forensics Prague 2012 is a technically intense event. What can attendees expect? What type of existing knowledge is necessary in order to attend?

SANS Forensics Prague is something of a unique event as it will be our first full week long digital forensics experience. As well as the four exceptional classes, we will be kicking off the whole event with the 3rd annual European Digital Forensics and Incident Response Summit, where we will be inviting some of the leading names in the industry to present and update the community on new developments in the field…

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Despite timestamps being ubiquitous, the understanding of their exact meaning is mostly overlooked in favor of fully-automated, correlation-based approaches. Existing work for practitioners aims at understanding Windows and is not directly applicable to Unix-like systems.

In this paper, we review how each layer of the software stack (kernel, file system, libraries, application) influences MACB timestamps on Unix systems such as Linux, OpenBSD, FreeBSD and macOS.

We examine how POSIX specifies the timestamp behavior and propose a framework for automatically profiling OS kernels, user mode libraries and applications, including compliance checks against POSIX.

Our implementation covers four different operating systems, the GIO and Qt library, as well as several user mode applications and is released as open-source.

Based on 187 compliance tests and automated profiling covering common file operations, we found multiple unexpected and non-compliant behaviors, both on common operations and in edge cases.

Furthermore, we provide tables summarizing timestamp behavior aimed to be used by practitioners as a quick-reference.

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