The keyword here is “persistence.”  First, attackers must find their way into the networks of the target. Usually, they employ targeted spear phishing, painstakingly staking out the right victim to receive that loaded email.  The investment of time and money at this point is essential, so as not to tip anyone off. And the emails are crafted so carefully, picking up on points tailored to that recipient so that they will open it, and launch the attachment that will create an entry point for the attacker. There is a reason why phishing is at the heart of so many breaches.

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