Paper Info
Title
In the Land of MMUs: Multiarchitecture OS-Agnostic Virtual Memory Forensics
Abstract
The first step required to perform any analysis of a physicalmemory image is the reconstruction of the virtual address spaces, which allows translating virtual addresses to their corresponding physical offsets. However, this phase is often overlooked, and the challenges related to it are rarely discussed in the literature. Practical tools solve the problem by using a set of custom heuristics tailored on a very small number of well-known operating systems (OSs) running on few architectures. In this article, we look for the first time at all the different ways the virtual to physical translation can be operated in 10 different CPU architectures. In each case, we study the inviolable constraints imposed by the memory management unit that can be used to build signatures to recover the required data structures from memory without any knowledge about the running OS. We build a proof-of-concept tool to experiment with the extraction of virtual address spaces showing the challenges of performing an OS-agnostic virtual to physical address translation in real-world scenarios. We conduct experiments on a large set of 26 different OSs and a use case on a real hardware device. Finally, we show a possible usage of our technique to retrieve information about user space processes running on an unknown OS without any knowledge of its internals.
Year
DOI
Venue
2022
10.1145/3528102
ACM TRANSACTIONS ON PRIVACY AND SECURITY
Keywords
DocType
Volume
Memory forensics, OS-agnostic forensics, virtual memory, MMU
Journal
25
Issue
ISSN
Citations 
4
2471-2566
0
PageRank 
References 
Authors
0.34
0
2
Name
Order
Citations
PageRank
Andrea Oliveri100.68
Davide Balzarotti22040113.64