Another Trojan horse is spreading through the Internet telephone network of Skype Ltd. The malicious code, known as both Warezov and Stration, is similar to an earlier version detected in February, but with a new URL and a new version of the malicious code, according to an alert posted Thursday by Websense Inc. Websense warns Skype users to watch for the message "Check up this," with a URL containing a hyperlink. When users click on the link, they are redirected to a site that is hosting a file named file_01.exe. Users are then prompted to run the file and if they do, several other files are downloaded and run. The downloaded files are other versions of the Waresov/Stration malicious code, so be careful when receiving messages from people not in your contact list.