The unprecedented scale and sophistication of modern cyberthreats, combined with the rapidly disappearing IT perimeter, means that while preventing an attack from becoming a breach is ideal, it is no longer realistic.
Advanced Persistent Threats use two primary methods of persistence: compromised endpoints and compromised credentials.
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(Note: Our Tech support scams FAQ page has the latest info on this type of threat, including scammer tactics, fake error messages, and the latest scammer hotlines.