A security update locked OSX.GenieoDropper.A
Sorted: type in the terminal
xattr -d com.apple.quarantine
leave a space after "quarantine" and then drag & drop the .app file.
Then press Return...et voila'!
The -cr flag is for operating systems before (and including) Mavericks. For newer operating systems (Yosemite & El Capitan) you must specify the flag -d along with the attribute (com.apple.quarantine) you wish to remove.