After downloading a CD/DVD burning program, a user notices that someone is remotely accessing the computer during nighttime hours. Which type of malware is likely found in the CD/DVD software?

The likely type of malware found in the CD/DVD burning software is a Trojan horse. A Trojan horse is a type of malicious software that disguises itself as a legitimate application. Users may download it believing they are obtaining a useful program, but upon installation, it can execute unauthorized actions, such as providing remote access to the attacker.

In this scenario, the user's report of noticing remote access during nighttime hours suggests that the software has likely compromised the system by allowing a remote user to connect and control the computer without permission. This typically aligns with the behavior of a Trojan, which can facilitate such remote access by exploiting the trust users place in software that appears to be legitimate.

The other forms of malware mentioned—viruses, worms, and adware—have different characteristics. Viruses often require human action to spread, worms can replicate and spread across networks, and adware primarily serves to display unwanted advertisements. While these other types of malware could also pose threats, the specific behavior described (remote access) is most characteristic of a Trojan horse.