Kevin Joseph Leach

Rice 434, cubicle 5 — kjl2y@virginia.edu

School of Engineering and Applied Science, University of Virginia

 

Current Research

My work was substantially funded by the Cyber Systems Assessments group at MIT Lincoln Laboratory, as part of the LOPHI (Low-artifact Observable Physical Host Instrumentation) project.

Debugging Transparency

My current research focuses on a specific sub area of systems security called the debugging transparency problem. In essence, I am developing tools that help engineers analyze malicious code without being detected.

Background

In order to develop defenses against malicious code, engineers must first understand what a sample does and how it behaves. This includes understanding the underlying vector by which infection occurs, as well as the behavior of the malicious payload that executes once a host becomes infected. There are many tools used to understand malware's behavior, from bread and butter debuggers like GDB to more advanced packages such as IDA Pro. Recently, automated triage tools are used to identify samples from a large corpus of malware.

The Problem

Unfortunately, while our defenses have improved a great deal, so too has the complexity of malware. State of the art malicious code is capable of detecting the presence of debuggers and other analysis tools. If the malware can detect a tool, it can change its behavior (i.e., hide itself), break specific debuggers, or otherwise conceal its true nature from the analyst. In these cases, we want to have tools capable of analysis that cannot be detected by the malicious code.

Artifacts and Transparency

Malware can detect certain eccentricities that exist or are produced by analysis tools. As a simple example, in Windows, the kernel API provides a method called isDebuggerPresent. Malware can trivially detect debuggers that modify this method's return value. We refer to these behaviors and oddities as artifacts. Thus, the debugging transparency problem concerns the study and development of artifact-free analysis tools.