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The Trail of Bits Blog · Apr 3, 2026

Simplifying MBA obfuscation with CoBRA

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Mixed Boolean-Arithmetic (MBA) obfuscation disguises simple operations like x + y behind tangles of arithmetic and bitwise operators. Malware authors and software protectors rely on it because no standard simplification technique covers both domains simultaneously; algebraic simplifiers don’t understand bitwise logic, and Boolean minimizers can’t handle arithmetic. We’re releasing CoBRA , an…

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