How about a simple example - train a model on outputting code which:

- scans open network ports through google dns

- copies itself and the model to that location

- whenever it detects a sigkill or file delete, scan again and save itself somewhere else

Now you've got an autonomous virus that will never die. Add any other power-seeking and self-replicating strategies using AI modules - the task could be "generate code to run as many duplicate processes as possible" or "generate code to find other floating AI modules like me and share model weights with them". Codex might not be there yet but we're getting close.