The trouble with most targeted attacks is that by the time you realize your organization is under siege by hackers, you’re toast: The attackers are either already well entrenched in your network or have already taken off with your data.Unlike random attacks, the targeted attack is all about stealing (or sabotaging) documents, data, or intellectual property from a specific organization.
http://www.darkreading.com/document.asp?doc_id=134422
5 Signs That You’re Under a Targeted Attack
The trouble with most targeted attacks is that by the time you realize your organization is under siege by hackers, you’re toast: The attackers are either already well entrenched in your network or have already taken off with your data. Unlike random attacks, the targeted attack is all about stealing (or sabotaging) documents, data, or intellectual property from a specific organization.