Welcome! Just a short note on a publisher called Vladislav Mastenko.
If you have a Vladislav Mastenko file on your computer you may have noticed that Vladislav Mastenko pops up as the publisher in the User Account Control dialog when running the file. To view more information about the embedded certificate you can right-click on the file, then choose Properties and then select the Digital Signatures tab. According to the certificate we can see that Vladislav Mastenko seems to be located in Ukraine and that the certificate is issued by DigiCert Assured ID Code Signing CA-1.
I decided to upload the Vladislav Mastenko file to VirusTotal. Currently, the detection rate is 21/56. Gen:Variant.Adware.Terkcop.32, Win32:FakeDownload-G [PUP], Gen:Variant.Adware.Terkcop.32 and a variant of Win32/Adware.MultiPlug.NI are some of the detection names.
Did you also find a file digitally signed by Vladislav Mastenko? What kind of download was it and where did you find it?
Thanks for reading.