There are two possibilities for this:

One, hook up to a module or service that will inject the malware for you (these absolutely exist).

Two, there are lots of well-known vulnerabilities out there that a lot of people haven’t patched…and ChatGPT may know what they are!

You could prompt it with “write malware like this with a delivery mechanism that uses the top five known exploitable vulnerabilities” (yes there is a list).