What type of malware is indicated by unusual CPU utilization and encrypted files, along with a ransom note?

• A. Worm
• B. Trojan
• C. Ransomware
• D. Adware

Answer: (C)

The presence of unusual CPU utilization, encrypted files, and a ransom note strongly indicates ransomware. This type of malware specifically targets files on a system by encrypting them and making them inaccessible to the user until a ransom is paid. The ransom note is an essential characteristic, as it typically provides instructions on how to pay the ransom in exchange for the decryption key necessary to regain access to the compromised files.

In contrast, worms are self-replicating malware that spread across networks and exploit vulnerabilities but do not typically encrypt files or demand a payment. Trojans, while they can cause harm to the system and potentially lead to data theft, do not inherently encrypt files or present ransom notes as ransomware does. Adware is designed primarily for showing advertisements and does not involve file encryption or ransom notes.