Cybersecurity Professionals Share Stories of Discovering Major Security Breaches Others Missed

This Reddit post asks cybersecurity professionals to share their experiences regarding the discovery of major security breaches that others had missed. The author is particularly interested in the intuitive aspect of the work and requests examples of telltale signs, such as an unusual spike in outbound traffic or a suspicious PowerShell command. The post seeks to gather testimonials about the precise moment when analysts realized that a system had been compromised.