
65
threAts to ICs
attacks that slip silently through perimeter security, either through
Web-based exploits or on portable storage devices like USB keys, per-
sonal media players, or smart phones.
Even if the ICS devices are not based upon Windows operating
systems, they can certainly suer from the collateral damage if a
Windows device in their proximity becomes infected. Similarly, in
the course of performing its automated reconnaissance, modern mal-
ware will scan all reachable networks: if there is even the smallest hole
in a rewall or error in a routing or switching table leading to the ICS
network, modern malware will nd it.
Part of the t