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Last month, users were more likely to be struck by trojans than any other kind of virus. The total amount of malware removed from Australian PCs grew by over 55 percent in the first half of 2008, Microsoft has reported. With the emergence of new attack techniques and the reinvention of old ones, 2008 has been a year of cybercriminal innovation. Internet fraudsters did not wait long to capitalise on the election of Barack Obama, flooding inboxes on Wednesday with malware spam. Two security firms have revealed that spam attacks have increased in the last quarter. Computer users have been warned of a spam campaign that poses as an electronic postcard in an attempt to lure the unwary into downloading a web-based Trojan. Users are encouraged to patch their systems immediately with an out-of-band fix from Microsoft for a major Internet Explorer vulnerability. PDF and Flash files will be used by cybercriminals much more in 2009. Victims infected with new malware may have their financial login credentials sent to a web address in Russia. Spammed links leading to Koobface are likely to come from infected friends. Since Microsoft's Windows Server Service vulnerability was patched in late October, exploits have continually surfaced. Symantec warned this weekend of a new worm taking advantage of a Microsoft bug, prompting the security company to raise its ThreatCon level. A worm, exploiting the emergency Microsoft patch, turns infected computers into bots that can launch DDoS attacks. Newly organised methods of online criminal activity are threatening to democratise fraud and undermine banks and online traders, according to security experts at this year’s RSA Conference Europe. Websense has detected a new round of 'Better Business Bureau' spam emails. Protecting users from internet-borne threats falls on trusted websites, says Overstock's Sam Peterson. Dan Kaplan reports. Scammers bypassing authentication systems. Websense warns of latest malware threat. Security vendors have warned of an increase in cybercrime during the holiday season. AVG announced yesterday that it would be offering a free year of service after its antivirus software got confused and misidentified a key Windows system file as malware.