Abstract: Various embodiments of a system and method for blocking malicious program behaviors, such as keystroke logging behavior or screen capture behavior, are disclosed. Security software may execute on a computer system, where the security software is operable to monitor the computer system to detect malicious program behavior. In response to detecting a first condition indicating that monitoring of the computer system to detect malicious program behavior should be initiated, the security software automatically initiates monitoring of the computer system to detect malicious program behavior. After initiating the monitoring for malicious program behavior, the security software may detect malicious program behavior of a second program executing on the computer system and block the malicious program behavior of the second program.