How does zero day malware differ from standard malware?

Absolutely no day malware, also called zero hour malware or zero day attacks, is a type of malware that takes benefit of a previously unidentified software vulnerability. Attackers who are able to exploit these vulnerabilities can access to a system or network without any detection. This makes no day malware a major hazard to organizations and people alike.

Standard malware, on the other hand, is malware that is popular and has been around for some time.  https://creaturesincrisis.org/?p=728 Standard malware can still be harmful, it is not as difficult or sneaky to identify as zero day malware.