Panda Security, a Spain-based antivirus maker, has been monitoring an onslaught of links with malicious software, or "malware," on Twitter that tag hot topics such as the Air France crash, the NBA finals, "American Idol" runner-up Adam Lambert and the new iPhone. "Cyber criminals have been targeting Twitter users by creating thousands of messages (tweets) embedded with words involving trending topics and malicious URLs," Sean-Paul Correll, a threat researcher for Panda Labs, wrote recently on a blog for the company. The growing sophistication of malware attacks mirrors the growing threat -- and cash -- generated by online crime. Already, cyber crime is estimated to cost companies and consumers more than $100 billion worldwide. Some officials claim it has now eclipsed illegal drugs as a criminal moneymaker.

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