There seems to be no end for different ways these malware writers try to go about infecting puters.
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Mr Robinson said many security firms were now logging instances in which spyware and adware firms are turning out software bundles that claim to roll together many popular codecs or just have the one needed to play a particular clip.
Some of the codecs do help to play clips, but others are disguised as a variety of nuisance or malicious programs.
Some rogue codecs plague users with pop-up adverts, while others invisibly install keyloggers that try to grab confidential data.
Anti-spyware firm Sunbelt Software discovered one codec that became a program that found fictitious security problems on a PC and demanded payment to repair them.