The present disclosure relates to systems and methods for enabling execution of encrypted managed programs in common managed execution environments. In particular the disclosure relates to method of loading and associating an extension module to the managed execution environment configured to receive execution event notifications. The events corresponding to the execution of encrypted methods are intercepted and passed on to a decryption module operable to execute within an hypervisor environment, such that the managed encrypted program is decrypted, executed in a secured location, preventing access of untrusted party. The decryption module is further configured to discard decrypted instruction if cooperation of the extension module is required, or upon program termination.