"We're getting used to the idea of infected PCs being used to send email spam but this is taking the idea one step forward creating a ‘botnet for spamming mobiles’." - Graham Cluley, senior technology consultant at anti-virus firm Sophos.

The Delf-HA trojan horse is not your normal virus. It uses infected PCs to send spam messages to mobile phone users, by using the free "Send a text message" function that is found on all too many websites. So far, infections have been pretty scarce, and the problems have mainly been felt in Russia. But with the world being the small place it is these days, who knows?