InformationIn order to mitigate firmware attacks Apple has created a automated Firmware check to ensure that the EFI version running is a known good version from Apple. There is also an automated process to check it every seven days.
If the Firmware of a computer has been compromised the Operating System that the Firmware loads cannot be trusted either.
SolutionIf EFI does not pass the integrity check you may send a report to Apple. Backing up files and clean installing a known good Operating System and Firmware is recommended.