One of the nice things about the ASD's Strategies to mitigate Targed Cyber Intrusoions is that they rank them by effectiveness. Saying that their top four would prevent 85% of intrusions.
Their top four are:
- Application Whitelisting.
 - Patching Applications.
 - Patching Operating System Vulnerabilities.
 - Restrict Administrative privileges.
 
Patching is two out …