Virus-like program that spreads automatically to other computers by sending itself out by email or by any other means. A program that propagates itself by attacking other machines and copying itself to the affected machine.
Worms have self-replicating code that travels from machine to machine by various means. A worms first objective is merely propagation. Worms can be destructive depending on what payload they have been given. Worms may replace files, but do not insert themselves into files.
W32.Silly is a worm that spreads through network shares and infects all files in the infected computer. It also download other threats from remote sites and executes them.
W32.Silly disables wide range of security tools.
Variants of W32.Silly can
Disable Windows AutoUpdate feature.
Infect Non-executable Files only.