How does zero day malware vary from standard malware?

No day malware, also understood as zero hour malware or absolutely no day attacks, is a type of malware that takes benefit of a formerly unidentified software vulnerability. Attackers who have the ability to exploit these vulnerabilities can access to a system or network with no detection. This makes no day malware a severe threat to businesses and individuals alike.

https://creaturesincrisis.org/?p=738 Standard malware, on the other hand, is malware that is widely known and has been around for some time.  resource Although conventional malware can still threaten, it is not as tough or stealthy to spot as absolutely no day malware.