
So I searched for the user "JohnnyFanny", and it's not a user on this forum.
Googling JohnnyFanny specifically though gives you a few results.There's a 2010/11 twitter page for a man called
"JohnnyFanny", who makes such interesting tweets as "Manganese" and "Bobo.com".
I think he's from Malaysia or the Phillipines perhaps. I'm not familiar with their languages, but he speaks in a language I would imagine comes from that corner of the world.
Then there's a DeviantArt for a user called davidfoxfire who created one piece of art called "JohnnyFanny Scrap 02".

He was producing more disturbing furry art of mice 10 years ago.
And a Facebook page for a "Johnny Fanny Givin Head", which also hasn't been in use since 2011 and features some pictures of the guy (but not the Twitter guy).
And then after that it's almost exclusively these /log/ websites with fake forums, where JohnnyFanny is listed as a member or admin or moderator.
And there's a lot of them. At least 30 between the first two page results, and more beyond.
Whoever it is making these virus forums they're very very prolific.
And it would seem if they are stealing names for their fake users they're not getting them exclusively from real forums.