How can i delete the Falcon app. I've tried running
sudo rm -rf /Applications/Falcon.app
in the terminal but that didn't work.
The padlock icon indicates that the file is locked.
This could be for two reasons…
Someone used Get Info… on the file & specifically locked it. This is simply reversible by the same method.
However, it's more likely that the application needs an uninstaller to remove and therefore locks itself to prevent partial uninstall by simply removing it from Finder (or in this case, Terminal).
It would be unwise to try override that. There are likely to be components installed elsewhere in the system that would misbehave - also be hard to find and/or delete.
The third alternative - having now looked up what Falcon actually is - is that your organisation's admin/IT department don't want you to be able to uninstall it without their permission. You need to log to your faculty's site & get an uninstaller ID.
Full information on how to deinstall are on the Crowdstrike Falcon site.
If the computer is provided by your employer or by the school, then very likely you don't have permission to delete it, and you might get in all sorts of trouble if you attempt it.
If you bought the system second-hand, and it's not stolen, you'll have to do a factory reinitialization, i.e. wipe the media and reinstall the OS.
Generally speaking, such systems are intrusive enough that without proper support in place to remove them, the only way of "removing" them is a wipe+reinstall.
If you ever get permission denied errors with sudo
on a Mac, the problem is almost certainly SIP. Reboot into recovery and turn that off (ignoring the overly-alarmist warnings), and then try running the command again. If it still doesn't work, then it's probably using a malware technique itself (ironic how often anti-malware does that, isn't it?), so try doing the removal itself from recovery or from another computer via Target Disk Mode.