The Budget Email Came From a Coworker. The Free PDF Tool Came With a Passenger.
On a Thursday afternoon an office received an email about the budget from one of its own people. His real mailbox sent it, because someone else was inside it, signed in from another country, and more than six thousand messages went out before the afternoon was over. Several staff noticed something wrong and said so. One clicked the link on her phone. The same afternoon the endpoint protection on the sender's laptop caught an installer dressed up as a free PDF tool. Here is why an email from a colleague is the hardest kind to doubt, why free converters are rarely free, and what to do in the first hour.
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