That is maybe hard maybe easy depend on what ico.
The easy way is looking roadmap, identify when they announcement match it with roadmap. Also check their social media like Linkedin, Facebook, Twitter, is it fake? That is easy if you already know how to compare it.
Hard way is looking review from the other investor, there is still many fake review. You need know why they give good review, must be keep take caution.
It seems to me that at the initial stage it is very difficult to detect fraud, since fraudsters also work and improve their skills in order to present information about the Project so that even more attentive and professional investors are deceived. Today, many cryptocurrency users are very attentive to the new project, and not as it was in 2016, and therefore even bad projects today look very attractive and promising.