Reverse Engineering Hostile Code

by Joe Stewart
Sept. 24, 2017 0 comments Symantec hostilecode

Computer criminals are always ready and waiting to compromise a weakness in a system. When they do, they usually leave programs on the system to maintain their control. We refer to these programs as "Trojans" after the story of the ancient Greek Trojan horse. Often these programs are custom compiled and not widely distributed. Because of this, anti-virus software will not often detect their presence. It also means information about what any particular custom Trojan does is also not generally available, so a custom analysis of the code is necessary to determine the extent of the threat and to pinpoint the origin of the attack if possible. This article outlines the process of reverse engineering hostile code. By "hostile code", we mean any process running on a system that is not authorized by the system administrator, such as Trojans, viruses, or spyware. This article is not intended to be an in-depth tutorial, but rather a description of the tools and steps involved.

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