Known or Unknown
There two types of malware: Known and Unknown.
- A Known virus is a piece of widespread and prevalent malware discovered in the past four weeks. Detection of known viruses is relatively trivial because for the past decade or so, the antivirus industry has evolved into a “coopetition” landscape (in other words, a coexistence of cooperation and competition), through which security researchers and solution providers proactively and voluntarily share discovery of new virus samples with absolutely secure measures.
- An Unknown virus, better known as a zero-day attack, is a threat that exploits an unknown computer security vulnerability.