Looking at the challenge, it gives us the file called `megacorp-01.cap`. A file with the cap extension is most likely a packet capture file created by packet sniffing programs.
To work on this challenge we need to convert the file to suitable format for hashcat which is the tool we will use for this as it supports using gpu power.
Converting the file is easy using an online tool at `https://hashcat.net/cap2hashcat/ `which gives us a file with hc22000 extension.As a wordlist, we will use rockyou.txt which can be downloaded from `https://github.com/brannondorsey/naive-hashcat/releases/download/data/rockyou.txt`.
Then we crack the file using hashcat by running the following command `hashcat -m 22000 file.hc22000 rockyou.txt`.
After it's done we will see the password which is `nanotechnology` so the final flag is `uiuctf{nanotechnology}`.
In overall good beginner challenge.