If you have an Android, look out. You might have mistakenly downloaded a Trojan, which will cause your bill to skyrocket. CNet reports it’s believed to be the first Trojan malware that targets the Droid. So far, it appears to be affecting users in Russia, but it’s something to watch for. Like all apps, the program asks for permission to do certain things upon install. In this case it asks for permission to send SMS messages, with a prompt that identifies it as a “service that costs you money.” Once installed, the Trojan can start sending SMS messages, costing several dollars per message, and the device owner often isn’t aware of it. Google says — only install apps you trust.