Register.UK: F-Secure snaps up Little Flocker in big F-off to Mac malware. April 6, 2017 Garret Vreeland Made available as F-Secure XFENCE, Little Flocker's technology will be used to boost the appeal of F-Secure's existing corporate and consumer macOS security products by adding behavioural blocking tech. The upgrades will help protect the growing corpus of Apple machines against modern targeted attacks.