What does virulent mean?

The term virulent means a technique that generates a fixed length value summarising a file or message contents.

The term virulent means a term for a program that looks benign but actually has a malicious purpose.

The term virulent means essentially the same thing in reference to a computer virus as it does to a biological virus. It is a measure of how rapidly the infection spreads and how easily it infects new targets.

The term virulent means copying itself to the Windows directory as avserve.exe and creates a Registry key to load itself at startup.