Most often, these are the four main factors:
All these may get rise to an APT attack aimed at big business. It is not a fantasy, it is a reality faced by each financial institution, large retail or manufacturing company. Basic means of protection ensuring safety of the infrastructure create an obstacle but do not guarantee complete protection. There is a need of strengthening them with special countermeasures against precisely targeted attacks. For the details, read here.
First, it is necessary to configure a properly operating information security system in general, and then strengthen it from targeted attacks. We can help with both. Our experts have extensive experience in building such systems.