What is no day malware?

Zero day malware is malware that is not yet known to anti-virus software application vendors or companies. It makes use of vulnerabilities in software application or hardware that have not yet been patched or repaired. The term "absolutely no day" comes from the reality that when the malware is found, there is zero time to spot the vulnerabilities before attackers can exploit them.

No day malware is frequently used in targeted attacks against specific companies or people. The attackers will carefully select their targets, and after that craft their malware to specifically make use of the vulnerabilities in those target's systems. This makes absolutely no day malware very challenging to protect and identify against.

One of the most famous examples of zero day malware is the Stuxnet worm, which was used to attack industrial control systems.  https://sakeradvantage.com/?p=1576 Stuxnet was able to spread itself through USB drives and contaminated networks of computer systems, without being detected by anti-virus software. It then specifically targeted Siemens commercial control systems, and caused physical damage to centrifuges in Iran.

Absolutely no day malware is a major hazard to organizations and individuals.  https://thumbpower.org/?p=661 It is crucial to keep your systems up-to-date with the current security patches, and to be familiar with the most current hazards.