01-05-2018, 10:35 AM
That's a 3 MB file compressed (uncompressed maybe even much larger if not totally random data).
Are there several files within the .7z file ?
You could also try to increase the limit that hashcat accepts for 7-Zip hashes as mentioned a couple of times within this forum (but at your on risk, the hash will be very, very, very long... the memory consumption will also increase a lot over 3 MB and you would need to test it a lot if everything is working correctly with higher limits... but lzma1/lzma2 decompression to check the checksum shouldn't be a problem even with much larger files).
Are there several files within the .7z file ?
You could also try to increase the limit that hashcat accepts for 7-Zip hashes as mentioned a couple of times within this forum (but at your on risk, the hash will be very, very, very long... the memory consumption will also increase a lot over 3 MB and you would need to test it a lot if everything is working correctly with higher limits... but lzma1/lzma2 decompression to check the checksum shouldn't be a problem even with much larger files).