A major manufacturing company that had implemented a complete anti-virus program for their IT environment. All client hardware was required to have a specific anti-virus program with up-to-date signature files. The IT servers were likewise protected. In addition access to the IT systems was restricted to approved gateways and firewalls.
The process control environment was under the control of a different department, which did not implement anti-virus protection or controlled access. Late one night an control engineer, working on a production problem, logged in from home. He dialed directly into one of the process control servers, something that had been done countless times before. But in this particular case his personal PC at home had been infected with the Nimda virus. It did not take long for the virus to hop across the production environment that was not prepared for this type of threat.
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