As recently reported by The Register, a proof-of-concept PLC worm could spell disaster for the critical infrastructure by making attacks exponentially more difficult to detect and stop. Unfortunately, the proof of concept of a PLC worm is a viable scenario which could cause immeasurable damage both in the power industry, and to the lives of many people.
When planning a security posture on a control system, the best solution is to deploy ‘blanket’ technologies and methods, which addresses many threats and many classes of attacks. This is also much more cost effective. This is especially true in protection against remote control attacks, and in reducing malware from spreading more in the system.