according to F-Secure, trojans have been found in some apps (apk files), including those available in the Android Market. these trojans usually come with apps claiming new Angry Bird Seasons, Talking Tom Cat downloads, etc. once you installed them on your devices, they will send SMS messages to Russia, Germany and some other countries which cost 2 to 6 Euros each.

sources also claimed that the trojans developers have registered several accounts with the Android Market, and Google has no solutions yet to prevent them from flooding the market