Redis docker container has been hacked, next steps?

I accidentally left the port of my redis container open and noticed, that it crashed all the time today.

Now the mounted volume is full of files like, admin, root, www, apache, backup.db.

I closed the port, deleted the files and rebuild the docker container, is there a risk of my server outside of the container being infected?

There are no new or altered entries in crontab or the .ssh/authorized_keys file, but I’m not sure what I should check additionally.