I have tested some protection apps against netcut, and currently, non is working to defend/protect against netcut.
1. DroidSheep Guard (GPlay)
DroidSheep Guard protects your phone from DroidSheep, Faceniff & other hijackers. - Not working against netcut.
2. Wifi Protector (GPlay)
Detects and protects from all kinds of ARP (Address Resolution Protocol) related attacks in Wi-Fi networks, like DOS (Denial Of Service) or MITM (Man In The Middle). - Not working against netcut.
3. SharpWatcher (GPlay)
Prevent faceniff and droidsheep ( ARP Spoof ) attaks on your device without any effort, just turn on shARPWatcher and let it do the rest for you! - Not working against netcut.
For record, my phone is rooted.