Answer: Hope this helps :)
Explanation: Viruses embedded themselves in genuine programs and relied on these programs to propagate. Worms were generally stand alone programs that could install themselves using a network, USB or email program to infect other computers.
Trojan horses took their name from the gift to the Greeks during the Trojan war in Homer’s Odyssey. Much like the wooden horse, a Trojan Horse looks like a normal file until some predetermined action causes the code to execute.
Today’s generation of attacker tools are far more sophisticated, and are often a blend of these techniques.
These so-called “blended attacks” rely heavily on social engineering - the ability to manipulate someone to doing something they wouldn’t normally do – and are often categorised by what they ultimately will do to your systems.