Threat-hunting exercises
A relative newcomer to security monitoring (especially in the industrial space) is threat hunting. With threat hunting, you are not relying on passive or active detection systems to report security incidents, but rather you go find signs of malicious activity. This is unprompted—pick a direction and start digging. And with direction, I am referring to a hypothesis, theory, or interesting scenario. For example, we can take a stance of we have crypto miners running on our industrial HMI computers and start digging around in event logs, asset software lists, packet captures, and other security-related data to either prove or disprove this statement. Of course, this hypothetical statement is typically not pulled out of thin air but is based on situational events or reported issues—for example, operators might have been complaining that their HMI screens are slow.
Threat hunting will be explained in detail in Chapter 10, Threat Hunting, followed...
