ELECTRONIC CONTROL UNIT, ELECTRONIC CONTROL SYSTEM, LOG PROCESSING METHOD, AND NON-TRANSITORY COMPUTER-READABLE STORAGE MEDIUM STORING LOG PROCESSING PROGRAM

By an electronic control system, a log processing method, or a non-transitory computer-readable storage medium storing a log processing program, an electronic control unit is caused to: detect an abnormality in the electronic control unit when a power source state is an ignition-on state and an ignition-off state; acquire power source information of a vehicle; generate a security event log; store the security event log; and transmit the security event log.