Another Trojan horse is spreading through the internet telephone network of Skype.
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 Websense.
Websense warns Skype users to watch for the message ‘Check up this,’ with a URL containing a hyperlink.
The code itself isn't self-propagating but when it runs, the URL is sent to everyone on the user's contact list.
When users click on the link, they are redirected to a site that’s 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.
Once the Trojan is installed in a system, it tries to connect to a Yahoo mail server to send an SMTP (Simple Mail Transfer Protocol) message.
However, that server doesn't appear to be operating, according to Websense.