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 &amp; 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 &amp; El Capitan) you must specify the flag -d along with the attribute (com.apple.quarantine) you wish to remove.