A cloud by any other name…

by Simon Biles

"We are operating in a field that has only been around for, by all counts ( ok, let’s leave Babbage out of it ) not even a century, yet we seem to have run out of innovation. It’s a bit embarrassing actually – we cover it up nicely by making things a bit smaller, or a bit shinier – but really we’re all aware of the fact that, nice as these superficial improvements are – we’re no closer to innovation than a fresh coat of paint on a room is to a Van Gogh.

I’ve known this for a while – not that it stops me from wanting shiny things – but it really came to my attention with “cloud computing”…"

Read more at http://www.forensicfocus.com/simon-biles

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File timestamps are used by forensics practitioners as a fundamental artifact. For example, the creation of user files can show traces of user activity, while system files, like configuration and log files, typically reveal when a program was run.

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.

Learn more: https://dfrws.org/presentation/a-systematic-approach-to-understanding-macb-timestamps-on-unixlike-systems/

YouTube Video UCQajlJPesqmyWJDN52AZI4Q_i0zd7HtluzY

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