For some unknown reason I had trouble sleeping this night, so instead I spent a few hours hunting some adware installers. I found a file digitally signed by Stas Kosmov that bundled lots of unwanted software. Stas Kosmov will appear as the publisher when double-clicking on the file and in the file’s digital signature tab. According to the certificate Stas Kosmov is located in Kiev, Ukraine.
So, what does the anti-virus scanners say about this file? The following scan result should convince you to not run the Stas Kosmov file:
Did you also find a file signed by Stas Kosmov? Where did you find it?