Found the ad on LinkedIn and applied there. They emailed me back about a week later to invite me for interview, although it was the next day so only 24 hrs preparation which was kinda lame. I was applying a bit late so I guess it's fair.
The interview was on Zoom without video: they asked me some basic interview questions and some basic technical questions about cyber security. I didn't know much about cyber security at the time, so I didn't do too well: my expectation was that I'd have the opportunity to learn on the internship, as the job ad didn't specify that I needed some prior knowledge; but evidently I needed to know quite a bit of foundational knowledge.
Heard back again a week later that I was rejected because I didn't know enough about cyber security. If I had been successful I would have been asked to do a Host Forensics challenge, which consisted of analyzing some csv files that were basically a forensic image of a computer hard drive (open processes, driver information, file system information, and some others), and had to figure out what was wrong with it.
Completing that, a final interview would follow, and then you'd be hired.