You are your first line defense when it comes to malware or malicious applications, I have read many posts of people using "Android" security software or applications but malicious apps are not detected and this is why I stand by the fact that security apps do not work on Android the way they do on a PC.
When you install an application, check it's permissions and if you think it's asking for permissions that are too much or you don't like them, don't install it. There are probably other apps that will do what you want anyway...