I have never used or looked at Autoit before because i am no Windows user, but it looks like some BASIC dialect. Having no access to Autoit i would drop it into QBasic running in Dosbox, that way i even have a sandbox, and do some built-in function renaming. Should run just fine, the decrypter part i mean. Dll calls will obviously not work, but when toying around with malware i see that as a plus. 😅