Question

A signature-based antivirus system will not detect

a. Zero-day attacks
b. Trojans
c. Conficker
d. Spyware

Answer 1

A signature-based antivirus system will not detect zero-day attacks, Trojans, or spyware. Conficker is an exception as it is a widely known worm with established signatures.

Step-by-step explanation:

A signature-based antivirus system will not detect

1. Zero-day attacks: These are newly discovered vulnerabilities or exploits that have not been seen before, so there won't be any known signatures for the antivirus to detect them.
2. Trojans: These are malicious software disguised as legitimate programs. While some common Trojans may have known signatures, new and less common variants may not.
3. Spyware: This type of malware is designed to spy on your activities and collect sensitive information. New and evolving spyware may not have known signatures for detection.

Conficker, on the other hand, is a specific worm that was widely known and had established signatures. Therefore, a signature-based antivirus system should be able to detect it.