New Folder in my public html

Hello.
I am not sure if this a WordPress issue, but I own a site and today google search console notified me about dangerous / phishing content in it. As I saw there was a new folder in my public HTML, named “ii” which included “Hotmail” folders and other stuff not needed for my site I would like to ask if anyone has experienced anything like this. May this be caused by any of my plugins? I generally don’t like using a lot of plugins in my sites. I only have my builder, my security plugin, cookies plugin……….. Is it a virus?