It is very likely that in the future, online fraud will be increasingly common based on computer worm attacks. Not only are banks at risk, but online brokerage systems as well. Imagine the possible financial chaos a computer worm could cause by "buying and selling" online traded stocks. Major stocks often trade tens of millions of stocks a day, but still the stock price hardly changes until the end of the day. Normally, there is a balance between buyers and sellersnot so if computer worms are used to make random or targeted sales and buys in the name of thousands of infected users.
Spammers are increasingly interested to utilize computer worms, bots, and backdoors, providing financial motivation for virus writers to create them.