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Auditing ten malware-as-image benchmarks found hash-based deduplication still leaks test data, and rewrapping bytes alone can swing accuracy by 33 points

AspireAI community · arXiv
Malware family identification by rendering binaries as images is a popular approach, and papers on the standard benchmarks report 97-99% accuracy. This audit of ten such benchmarks finds that deduplicating by file hash, the standard practice, does not prevent leakage, because distinct binaries render to identical images, and that content-level deduplication cuts top-1 accuracy by up to 8 points and macro-F1 by up to 15 on the benchmarks found leaky. The rendering step itself adds duplication: byteplots of the same binaries contain 19.7% near-duplicates where static feature vectors contain 2.2%, and changing only the width at which bytes are wrapped into rows moves accuracy by 20 to 33 points with no byte changes. The recommendation is to report content-level duplication and a non-image baseline alongside accuracy.
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