US Patent 8443354 Detecting new or modified portions of code

Detecting new or modified portions of executable code is disclosed. An indication is received that a prior version of an executable file has been replaced by a new version. A security response is provided if a process associated with the executable file attempts to perform a restricted action and a new or changed portion of code comprising the new version has executed. If no new or changed portion of code has executed, the restricted action is allowed to an extent determined previously for the prior version of the executable file.