Perhaps it would be like the Paperclip Problem except the AI's instruction is just "make as much money as possible".

The joke is that the servers with the CIA's public-facing webpage are almost certainly completely separate from their servers with the intel they collect or any other relevant info, i.e. gaining control of the former would get you no closer to the latter.

If the other commentor is correct and you're thinking about WannaCry, that's kind of the gist of it. The malware was hard-coded to only do its thing if it couldn't connect to a particular (previously unregistered) DNS domain. Thus registering that domain "triggered" the kill-switch and stopped any future infections of that version of WannaCry. Per wikipedia, later versions didn't have that vulnerability.