No day malware, also known as no hour malware or zero day attacks, is a type of malware that makes the most of a previously unidentified software vulnerability. https://scarabnet.org/?p=507 Attackers who have the ability to exploit these vulnerabilities can acquire access to a system or network with no detection. This makes no day malware a severe hazard to individuals and organizations alike.
Traditional malware, on the other hand, is malware that is popular and has actually been around for a long time. Conventional malware can still be unsafe, it is not as sneaky or difficult to detect as zero day malware.