Industrial network behavior analysis method, apparatus and system, and computer-readable medium

Abstract

Various embodiments of the teachings herein include an industrial network behavior analysis method. The method may include: defining a first time window for a target industrial control system, for the target industrial control system to perform a control behavior; respectively determining an execution probability deviation for each control instruction within the first time window and using the execution probability to characterize the ratio of the number of times the corresponding control instruction is executed within a time period to the total number of times the control instruction within the time period; defining a second time window according to the control instruction characterizing a time period when the system performs the corresponding control behavior, and the control behavior is the same as that performed in the first time window. The method may include performing for each second time window: for each control instruction, calculating an execution probability; for each control instruction, determining whether the execution probability meets a target deviation, wherein the target execution probability deviation is the execution probability deviation of the control instruction in the first time window corresponding to the same in the second; determining that the control instruction is legal if the execution probability meets the target deviation; and determining that the instruction is suspicious if the execution probability of the control instruction does not.