Hashcat on Kali Linux

Download the Hashcat utils

wget https://github.com/hashcat/hashcat-utils/archive/master.zip

Run the following commands to unzip and make the binaries

unzip master.zip
cd hashcat-utils-master/src
make

You can now convert an aircrack file by invoking the cap2hccapx binary

./cap2hccapx.bin /path/to/aircrack.cap /path/for/output