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Their use in the analysis of malicious code was never a requirement.
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They are meant to be "good enough" so that typical software can be fooled to run inside them. It is important to note here that most virtual machine emulators are not designed to be completely transparent. No examples of this type of attack are presented in this paper. Finally, the most interesting attack that malicious code can perform against a virtual machine emulator is to escape from its protected environment. Some descriptions and samples of how that is done are presented in this paper. A harsher attack that malicious code can perform against a virtual machine emulator is the denial-of-service specifically, this type of attack causes the virtual machine emulator to exit. Some descriptions and samples of how virtual machine emulators are detected are presented in this paper. This behaviour makes analysis more complicated, and possibly highly misleading. Those samples alter their behavior (including refusing to run) if a virtual machine emulator is detected. As more security researchers rely on virtual machine emulators, malicious code samples have appeared that are intentionally sensitive to the presence of virtual machine emulators. The simplest attack that malicious code can perform on a virtual machine emulator is to detect it. This practice provides a safe way to see if a sample might be malicious. Once the analysis is complete, the environment can be destroyed, essentially without risk to the real environment that hosts it.
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For antimalware researchers, the most common use is to place unknown code inside a virtual environment, and watch how it behaves. INTRODUCTION irtual machine emulators have many uses. Index Terms Hardware-assisted, Hypervisor, Paravirtualization, Virtual Machine V I.
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This paper also nstrates newly discovered attacks on other virtual machine emulators (Bochs, Hydra, QEMU, and Xen), and describes how to def against them. This paper describes known attacks against the most widely used virtual machine emulators (VMware and VirtualPC). 1 SYMANTEC ADVANCED THREAT RESEARCH 1 Attacks on Virtual Machine Emulators Peter Ferrie, Senior Principal Researcher, Symantec Advanced Threat Research Abstract As virtual machine emulators have become commonplace in the analysis of malicious code, malicious code has started to fight back.