A user calls you in a panic. He is receiving emails from people indicating that he is inadvertently sending viruses to them. Over 200 such emails have arrived today. Which type of attack has most likely occurred?
a. SAINT
b. Backdoor attack
c. Worm
d. TCP/IP hijacking
Answer: C
A worm is a type of malicious code that attempts to replicate using whatever means are available. The worm may not have come from the user's system; rather, a system with the user's name in the address book has attacked these people.