Fake installers are no more new to security arena. So antivirus companies are fully aware about these trojans which mostly target Windows machine uptil now. But now, researchers from security firm Doctor Web have identified a variant that's designed for Mac OS X. Dubbed Trojan.SMSSend.3666, the malicious element disguises itself as an installer for a popular application called VKMusic 4 - an app that allows users to listen to music on a Russian social media site. Experts advise users to beware of pieces of software that request them to provide their mobile phone numbers or ones that ask them to send SMS messages. It can be avoided by downloading apps only from trusted locations.