The "cloud" will increasingly be used for malicious purposes in 2009, according to a report by security firm Websense.
Global enterprises must rethink their approaches to web, data and messaging security, the State of Internet Security report said.
The report also predicts an increased use of Rich Internet Applications (RIAs) such as Flash for malicious purposes.
With an explosion of demand for applications using these RIA technologies, security is an afterthought, opening up the door for cybercriminals, the report said.
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Attackers will increasingly take advantage of the programmable web where open application programming interfaces (APIs) allow websites to share functionality.
Web APIs are being released at a record rate, leaving little time for testing and requiring a level of trust between users, the report said.
Websense predicts the coming year will see a rise in the malicious use of some web service APIs to exploit trust and steal user credentials and other information.
The rise in the number and popularity of websites that allow user-generated content will make these sites attractive targets to cybercriminals.
This will lead to a significant rise in malicious content in blogs, forums and social networking sites, the report said.
Cybercriminals are expected to move to a more distributed way of controlling and hosting malcode after two main criminal hosting companies were shut down in 2008.
Shutting down the web hosting companies McColo and Intercage/Atrivo had a significant effect on spam.
Websense expects cybercriminals to distribute their servers and move to non-US hosting providers in 2009 to make it more difficult to track them down.
Based on the increased use of legitimate websites to host malicious code in 2008, this trend is expected to continue.
In 2009, more than 80% of all malicious content will be hosted on sites with good reputations, the report said.