This is Unix SHA512 hash This is something strange, looks like base64-encoded string, but does not decode.
$ echo '$6$F3rNxjN8VgmXt4+s$vAI/8rFViM1kCJ0Tzzk34nq60FhQBz014Nzr1Xmc37e/Mn9Cvy4WvW46rdwVIjlxg2SSGAOuVQ4PAPjD2dz0.1' > hashfile.txt $ hashcat -m 1800 -a 3 hashfile.txt rockyou.txt