TrojanDownloader:Win32/Stegvob
TrojanDownloader:Win32/Stegvob.gen!A
TrojanDownloader:Win32/Stegvob.B
TrojanDownloader:Win32/Stegvob.B is a trojan that silently downloads and installs other programs without consent. This could include the installation of additional malware or malware components to an affected computer.
TrojanDownloader:Win32/Stegvob.A
PWS:Win32/Codtree
PWS:Win32/Codtree is a trojan that steals credentials from web browsers and FTP clients.
Win32/FakeRean
Windows Defender detects and removes this threat.
This family of rogue security programs pretend to scan your PC for malware, and often report lots of infections. The program will say you have to pay for it before it can fully clean your PC.
However, the program hasn't really detected any malware at all and isn't really an antivirus or antimalware scanner. It just looks like one so you'll send money to the people who made the program. Some of these programs use product names or logos that unlawfully impersonate Microsoft products.
Even if you do pay to "unlock" the app, it won't do anything because your PC isn't actually infected with all that malware it "found".
Different brands of the rogues may modify various settings on your computer, end or close programs or system services, or block access to websites.