Hello readers! Just found yet another interesting file, this time signed by STMSetup. The following screenshot shows the User Account Control dialog when running the STMSetup file:

You can also view the certificate by right-clicking on the file, and looking under the Digital Signature tab: According to the embedded certificate we can see that STMSetup appears to be located in Tel-Aviv in Israel and that the certificate is issued by COMODO Code Signing CA 2.

What caught my attention was that the download was called Skype_Setup.exe. This might look like an official Skype download, but it is not. If it was an official download, it would be digitally signed by Skype Software Sarl. Here’s how the official Skype signature looks like:

So, what does VirusTotal say about Skype_Setup.exe? BehavesLike.Win32.CryptInno.bc, Install Core Click run software and InstallCore (fs) are some detection names:

Did you also find a STMSetup file?

Thanks for reading.