Use some common sense. Look at their website. Read the content. Look at their github. To the extent that I can even make sense of the semi-literate rambling on their website it sounds like a pretty grandiose project yet their github has very little activity: https://github.com/Cryptonex. The cryptonex source has 1 contributor and no activity for 21 days: https://github.com/Cryptonex/source
Look at "the team", no linked in profiles for anybody. No bios, only 3 have emails two are gmails and the "Founder" uses "[email protected]"? There are no other links for anybody except a Facebook for the "Founder". Cyrptonex.org is a private domain registration with godaddy. No physical address, no telephone. Check out their facebook page, the postings look very amateurish and scammy. There is even one that tells users not worry about virus warnings for their software (https://s26.postimg.org/h12nqn7eh/cryptonex.png).
And they claim they've already raised over $10 million with 16 days to go?
Let's say that other ICOs that turned out definitively to be scams had far more believable and professional looking online presences.
The "Founder's" other company "MegaSEO Group" has a blank Facebook page with one "like". https://www.facebook.com/pages/MegaSeo-Group/313831498820975
Shall I continue?
Does any of that sound legit to you?