A process called "Opera" (the browser is not installed) constantly uses 100% of my CPU. Does anyone know what this is?

I have a server box I use to host various web applications and game servers for friends. I recently connected to it to check how it was running, and discovered a program "Opera" trying to use over 3000% of my CPU according to top. I tried to kill it with pkill Opera and pkill then used killall to do the same, which worked initially, but the Opera program came back within a minute or so. I checked through all of my system services and cron jobs and can't find any mention of "Opera" anywhere, and trying to run the command manually ("Opera", not "opera" like the browser) just prompts me to install the opera browser from snap. top only informed me that opera was somehow located at ./Opera. I eventually tracked down the executable by following the symlink in /proc/ and found it in /var/tmp inside a "Documents" folder with some other odd files (a config.json, and several hidden files with strange names and no extensions) the picture I've included does not have the Opera file, as I deleted it. /var/tmp/Documents folder without the Opera executable" class="img-fluid rounded" style="max-width: 100%; height: auto; margin: 10px 0;" loading="lazy"> Deleting the executable seems to have fixed the problem, but I still have no idea what it was caused by or what the Opera executable is, what it was doing, and why it was executing from the /var/tmp folder. I mainly want to know if this is a known virus or trojen, and whether I should purge the user it's executing from. Editing this because I forgot to add my system info. My operating system is Ubuntu 22.04.4 LTS and I use bash as my kernel. my kernel version is Linux 5.15.0-116-generic Any help is appreciated, thanks!