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The act of reverse-engineering the malicious program to understand the code that implements the software behavior. For example, when looking at compiled programs, the process involves using a disassembler, a debugger, and perhaps a decompiler to examine the program’s low-level assembly or byte-code instructions. A disassembler converts the instructions from their binary form into the human-readable assembly form. A decompiler attempts to recreate the original source code of the program. A debugger allows the analyst to step through the code, interacting with it, and observing the effects of its instructions to understand its purpose.
CNSSI 4009-2015 from CNSSI 1011