Is marked on Microsoft’s website as being a “severe” virus. Strangely enough, there are no symptoms associated with this “severe” threat. Alert notifications from antivirus programs may be the only symptoms you will see. Malwarebytes Premium is my anti-virus program of choice. It found the Backdoor:PHP/Small.M. and quarantined it so I could delete it. Note: The Backdoor:PHP/Small.M virus is written completely in php.
So how do you remove it? Install your favorite anti-virus program, update it and scan your system, delete the virus. Restart your computer. Done.