Simple Mutation Ideas (substitution) with REX Prefix

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Table of contents Table of contents Abstract Case 1 Case 2 Case 3 Case 4 Case 5 Case 6 Case 7 Operand-Size Override Legacy Prefix Abstract On an Intel or AMD processor, when executing code from a 64-bit code segment (i.e., CS segment descriptor CS[L] bit = 1b and CS[D] = 0b), the 1-byte REX (i.e., Register eXtended) prefix can be used to modify operand addressing and selection. This can be for one…

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