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Small routines embedded within binary files that restore compressed code into memory during the initial execution phase.
Distinct from Runtime Code Injection: None of the candidates are relevant; they focus on simulation, proxying, or runtime hot-swapping, whereas this is a low-level system programming technique for binary execution.
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UPX is a command-line utility designed to reduce the file size of compiled programs and shared libraries. It functions as an executable binary compressor that maintains the ability for files to run natively without requiring additional runtime dependencies or external decompression software. The tool operates by parsing executable headers and applying entropy-based compression to code segments. It achieves this by injecting a self-extracting stub into the binary, which facilitates in-place memory decompression during the initial execution phase. This process includes platform-specific binary
"Appends a small decompression routine to the binary that restores the original code into memory during the initial execution phase."