Nice Article.

There are a number of growing companies that carry out this type of work; Blackhills Security (www.blackhillsinfosec.com), root9b (www.root9b.com), Precision Tradecraft (www.precision-tradecraft.com) etc etc.

I think the term 'Active Defense' or 'Active Defence' is sometimes tarnished with the idea of 'hacking back' and 'counterattack', and therefore is discounted. 'Annoy' and 'Attribution' as John refers to them, are valuable strategies that can be deployed by organisations to improve their defensive posture.