This virus alert is a scam. The goal is to get admins to download and execute special "removal tools", which are in fact the actual virus.
Another note about how websites work and what you see in the access log:
You can go to basically every website and append arbitrary parameters like
?cmd=foo&key=bar and the website will just load and ignore the parameter. This suspicious log entry may not mean anything at all!
Monitor your system closely to see if your it is indeed doing something fishy. E.g., by logging all HTTP traffic containing suspicious parameters.
The removal tool as advertised (There's a link in the comments - do not install), will open your firewall and allow an attacker to remote control your machine.
I recommend you also watch the thread following this freebsd-security mailing list post, if you want to know more.