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: It consists of 5 levels of nested zip files. The bottom level contains 16 files, each being 4.3 GB of zeros, which compress incredibly well.
It sounds like you're looking for the famous "44.5 KB" zip bomb (often rounded to 45K or 44K) and its technical write-up. Download 445K zip
If you are looking for a "good write-up" on how these work technically, these sources are highly regarded: : It consists of 5 levels of nested zip files
: Do not attempt to decompress this file on a standard computer. Most modern antivirus programs and zip utilities will detect it as a "zip bomb" or "decompression bomb" and block it to prevent your system from crashing or running out of disk space. Recommended Write-ups If you are looking for a "good write-up"
: This is the definitive modern write-up. Fifield explains how to create a "non-recursive" zip bomb that achieves high compression ratios without nesting files, making it much more dangerous for scanners. You can find his full research and graphs on his personal site .