Automatic translation of assembly shellcodes to printable byte codes

Géczi, Zsolt and Iványi, Péter (2018) Automatic translation of assembly shellcodes to printable byte codes. Pollack Periodica, 13 (1). pp. 3-20. ISSN 1788-1994

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Abstract

The generation of printable shellcode is an important computer security research area. The original idea of the printable shellcode generation was to write a binary, executable code in a way that the generated byte code contains only bytes that are represented by the English letters, numbers and punctuation characters. In this way unfortunately only a limited number of CPU instructions can be used. In the originally published paper a small decoder is written with instructions represented by printable characters and the shellcode is decoded on the stack to be executed later. This paper, however describes a proof of concept project, which converts the source code of a full assembly program or shellcode to a new source code, whose compiled binary code contains only printable characters. The paper also presents new, printable character implementation of some CPU instructions.

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