The film went through 18 drafts before the final script was locked down.
In a few of the original drafts, the character of Ian Braddick was very different. He was a much more paranoid person who had no relationships with any other people at all.
Filmed using the Red Epic.
Viral was shot on location in the apartment shared by the creative team of Josh Green, T Zhang and Nicholas Walker. The three converted their apartment into the set for the duration of the shoot.