Turning our RAT into a worm to increase reach Now we have a working RAT that can persist on infected machines, it's time to infect more targets. What is a worm A worm is a piece of software that can replicate itself in order to spread to other machines. Worms are particularly interesting for ransomware and botnet operators as reaching critical mass is important for these kinds of operations. That being said, stealth worms are also used in more targeted operations (e.g. Stuxnet). Worms are the evolution of viruses adapted to the modern computing landscape. Today, it's very rare to