LO! LLVM Obfuscator

Examensarbete för masterexamen

Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.12380/211348
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Type: Examensarbete för masterexamen
Master Thesis
Title: LO! LLVM Obfuscator
Authors: RIERA, FRANCISCO BLAS IZQUIERDO
Abstract: As part of this Master’s Thesis some patches to LLVM have been written allowing the application of obfuscation techniques to the LLVM IR. These patches allow both obfuscation and polymorphism which results in code that is both hard to read and different from previous versions. This, makes finding the real changes made between versions harder for the attacker. The techniques are applied using a function attribute as the seed for the CPRNGs used by the transformations as a source of entropy. As a result it is possible to mark the functions that should be obfuscated in the prototypes allowing the developer to create binaries with the desired amount of changes and a sufficiently large amount of functions that are hard to read and (if the seed is changed) different from previous versions. In this Master’s Thesis the possible ways in which the applied techniques can be “reversed” have been evaluated to be able to compare the resulting code. For this to succeed a transformation able to obtain LLVM IR from the resulting binary code is necessary, this was not done as part of this work.
Keywords: Informations- och kommunikationsteknik;Data- och informationsvetenskap;Data- och systemvetenskap;Information & Communication Technology;Computer and Information Science;Computer and systems science
Issue Date: 2014
Publisher: Chalmers tekniska högskola / Institutionen för data- och informationsteknik (Chalmers)
Chalmers University of Technology / Department of Computer Science and Engineering (Chalmers)
URI: https://hdl.handle.net/20.500.12380/211348
Collection:Examensarbeten för masterexamen // Master Theses



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