The most important thing to understand about dealing with a true advanced persistent threat is that it’s like having pneumonia. It’s often not easy to cure, and if you try to cure it without the right medication, it can mutate and become resistant. An APT is worse than ordinary pneumonia – it is like designer pneumonia that’s been genetically engineered specifically for you. This white paper highlights: The anatomy of a targeting attack; the anatomy of an APT; a custom case study; and solutions to deal with the APT.”]
Source: https://www.bankinfosecurity.com/whitepapers/case-study-advanced-persistent-threats-w-971