An Exploratory Study of Software Reverse Engineering in a Security Context

Software reverse engineering—the process of analysing a system to identify its components and to create representations of the system in other forms or at higher levels of abstraction—is a challenging task. It becomes even more challenging in security contexts such as the detection of malware or the decryption of encrypted file systems. In such settings, web resources are often unavailable because work has to be performed offline, files can rarely be shared in order to avoid infecting co-workers with malware or because information is classified, time pressure is immense, and tool support is limited.

To gain insights into the work done by security reverse engineers, Peggy, Fernando Figueira Filho, Martin Salois from DRDC Valcartier and I conducted an exploratory study aimed at understanding their processes, tools, artifacts, challenges, and needs. The results of this study will be presented at WCRE 2011 in Limerick, Ireland, in October.

We identified five processes that are part of reverse engineering in a security context:

  • analyzing assembly code,
  • documenting findings through different kinds of artifacts,
  • transferring knowledge to other reverse engineers,
  • articulating work, and
  • reporting of findings to stakeholders.

There is no general process that can capture all of the work done by security reverse engineers. Task complexity, security context, time pressure, and tool constraints make it impossible to follow a structured heavyweight process. Therefore, process and tool support has to be lightweight and flexible.

In our future work, we hope to address the challenges with improved tools and processes, and to study their usefulness in the unique work environment of security reverse engineers.

A pre-print of the paper is available here
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This is the abstract of the paper:

Illegal cyberspace activities are increasing rapidly and many software engineers are using reverse engineering methods to respond to attacks. The security-sensitive nature of these tasks, such as the understanding of malware or the decryption of encrypted content, brings unique challenges to reverse engineering: work has to be done offline, files can rarely be shared, time pressure is immense, and there is a lack of tool and process support for capturing and sharing the knowledge obtained while trying to understand plain assembly code. To help us gain an understanding of this reverse engineering work, we report on an exploratory study done in a security context at a research and development government organization to explore their work processes, tools, and artifacts. In this paper, we identify challenges, such as the management and navigation of a myriad of artifacts, and we conclude by offering suggestions for tool and process improvements.

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